Empathy List Archives

FB

Frederick Bray

Tue, Jun 22, 2021 2:20 AM

I have a HP Z3801A with a dead GPS receiver. I understand that it is
possible to drop in an Oncore VP 8 channel receiver as a replacement --
not withstanding the fact that the Z3801A will only see six channels.

I see that Motorola R5122U1154 8 channel receivers are available. Does
anyone know whether this will function in the Z3801A? I'd like to get
it working again.

Thanks.

Fred Bray, KE6CD

I have a HP Z3801A with a dead GPS receiver. I understand that it is possible to drop in an Oncore VP 8 channel receiver as a replacement -- not withstanding the fact that the Z3801A will only see six channels. I see that Motorola R5122U1154 8 channel receivers are available. Does anyone know whether this will function in the Z3801A? I'd like to get it working again. Thanks. Fred Bray, KE6CD

AS

Alexandre Souza

Tue, Jun 22, 2021 2:28 AM

Which one is the original receiver on the Z8301A? I wasn't able to quickly
google this info :\

---8<---Corte aqui---8<---
http://www.tabajara-labs.blogspot.com
http://www.tabalabs.com.br
---8<---Corte aqui---8<---

Em seg., 21 de jun. de 2021 às 23:21, Frederick Bray fwbray@mminternet.com
escreveu:

I have a HP Z3801A with a dead GPS receiver. I understand that it is
possible to drop in an Oncore VP 8 channel receiver as a replacement --
not withstanding the fact that the Z3801A will only see six channels.

I see that Motorola R5122U1154 8 channel receivers are available. Does
anyone know whether this will function in the Z3801A? I'd like to get
it working again.

Thanks.

Fred Bray, KE6CD

time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send
an email to time-nuts-leave@lists.febo.com
To unsubscribe, go to and follow the instructions there.

Which one is the original receiver on the Z8301A? I wasn't able to quickly google this info :\ ---8<---Corte aqui---8<--- http://www.tabajara-labs.blogspot.com http://www.tabalabs.com.br ---8<---Corte aqui---8<--- Em seg., 21 de jun. de 2021 às 23:21, Frederick Bray <fwbray@mminternet.com> escreveu: > I have a HP Z3801A with a dead GPS receiver. I understand that it is > possible to drop in an Oncore VP 8 channel receiver as a replacement -- > not withstanding the fact that the Z3801A will only see six channels. > > I see that Motorola R5122U1154 8 channel receivers are available. Does > anyone know whether this will function in the Z3801A? I'd like to get > it working again. > > Thanks. > > Fred Bray, KE6CD > > > > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send > an email to time-nuts-leave@lists.febo.com > To unsubscribe, go to and follow the instructions there.

AS

Art Sepin

Tue, Jun 22, 2021 3:54 AM

Hi Fred,

I apologize if the following smells overtly commercial; it's only intended to answer your questions and explain where we are in the process of producing GPS replacement products for legacy timing instruments.

The 6 and 8 channel Motorola VP and 8 channel UT+ will not work as replacements. Those products have also reached their 1024 Week-Roll Over limits. The HP Z3801A and Z3805A products only respond to 6 channel commands and produce 6 channel reply messages.

We have developed single-board clones for the Motorola VP and UT+ products, as drop-in replacements, that are lower in cost than Synergy's 2-board Adaptor Board products (Shooting for dropping to less than $190 if component prices don't go even higher!). The SSR-VP can plug into the HP Z3801A and Z3805A products.

A different part number SSR-VP designed to drop into HP 58503A and an SSR-UT+, designed to drop into HP 58503B products, have also been completed but firmware for those have yet to be tested in actual instruments. With the proper firmware loads, the SSR Drop-In products should be candidates for upgrading many other legacy timing instruments.

We had planned for the single board "Drop-In" products to be available near the end of 2020 but COVID-19 changed things for us. We are now planning a small production run to satisfy folks that have already been in touch with us but we need to complete our boot-loader for firmware updates first. With current work load, I'd estimate 90 - 120 days for HP Z3801A and Z3805A replacements. If you are interested we can put you on our list.

Apologies for the quasi-commercial intrusion!

Art

-----Original Message-----
From: Frederick Bray fwbray@mminternet.com
Sent: Monday, June 21, 2021 7:21 PM
To: time-nuts@lists.febo.com
Subject: [time-nuts] Z3801A Receiver Replacement

I have a HP Z3801A with a dead GPS receiver. I understand that it is possible to drop in an Oncore VP 8 channel receiver as a replacement -- not withstanding the fact that the Z3801A will only see six channels.

I see that Motorola R5122U1154 8 channel receivers are available. Does anyone know whether this will function in the Z3801A? I'd like to get it working again.

Thanks.

Fred Bray, KE6CD

time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-leave@lists.febo.com To unsubscribe, go to and follow the instructions there.

Hi Fred, I apologize if the following smells overtly commercial; it's only intended to answer your questions and explain where we are in the process of producing GPS replacement products for legacy timing instruments. The 6 and 8 channel Motorola VP and 8 channel UT+ will not work as replacements. Those products have also reached their 1024 Week-Roll Over limits. The HP Z3801A and Z3805A products only respond to 6 channel commands and produce 6 channel reply messages. We have developed single-board clones for the Motorola VP and UT+ products, as drop-in replacements, that are lower in cost than Synergy's 2-board Adaptor Board products (Shooting for dropping to less than $190 if component prices don't go even higher!). The SSR-VP can plug into the HP Z3801A and Z3805A products. A different part number SSR-VP designed to drop into HP 58503A and an SSR-UT+, designed to drop into HP 58503B products, have also been completed but firmware for those have yet to be tested in actual instruments. With the proper firmware loads, the SSR Drop-In products should be candidates for upgrading many other legacy timing instruments. We had planned for the single board "Drop-In" products to be available near the end of 2020 but COVID-19 changed things for us. We are now planning a small production run to satisfy folks that have already been in touch with us but we need to complete our boot-loader for firmware updates first. With current work load, I'd estimate 90 - 120 days for HP Z3801A and Z3805A replacements. If you are interested we can put you on our list. Apologies for the quasi-commercial intrusion! Art -----Original Message----- From: Frederick Bray <fwbray@mminternet.com> Sent: Monday, June 21, 2021 7:21 PM To: time-nuts@lists.febo.com Subject: [time-nuts] Z3801A Receiver Replacement I have a HP Z3801A with a dead GPS receiver. I understand that it is possible to drop in an Oncore VP 8 channel receiver as a replacement -- not withstanding the fact that the Z3801A will only see six channels. I see that Motorola R5122U1154 8 channel receivers are available. Does anyone know whether this will function in the Z3801A? I'd like to get it working again. Thanks. Fred Bray, KE6CD _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-leave@lists.febo.com To unsubscribe, go to and follow the instructions there.

FB

Frederick Bray

Tue, Jun 22, 2021 3:57 AM

Art,

Thanks for the info. Please do put me on the list for updates.

Fred

On Jun 21, 2021, at 8:55 PM, Art Sepin art@synergy-gps.com wrote:

Hi Fred,

I apologize if the following smells overtly commercial; it's only intended to answer your questions and explain where we are in the process of producing GPS replacement products for legacy timing instruments.

The 6 and 8 channel Motorola VP and 8 channel UT+ will not work as replacements. Those products have also reached their 1024 Week-Roll Over limits. The HP Z3801A and Z3805A products only respond to 6 channel commands and produce 6 channel reply messages.

We have developed single-board clones for the Motorola VP and UT+ products, as drop-in replacements, that are lower in cost than Synergy's 2-board Adaptor Board products (Shooting for dropping to less than $190 if component prices don't go even higher!). The SSR-VP can plug into the HP Z3801A and Z3805A products.

A different part number SSR-VP designed to drop into HP 58503A and an SSR-UT+, designed to drop into HP 58503B products, have also been completed but firmware for those have yet to be tested in actual instruments. With the proper firmware loads, the SSR Drop-In products should be candidates for upgrading many other legacy timing instruments.

We had planned for the single board "Drop-In" products to be available near the end of 2020 but COVID-19 changed things for us. We are now planning a small production run to satisfy folks that have already been in touch with us but we need to complete our boot-loader for firmware updates first. With current work load, I'd estimate 90 - 120 days for HP Z3801A and Z3805A replacements. If you are interested we can put you on our list.

Apologies for the quasi-commercial intrusion!

Art

-----Original Message-----
From: Frederick Bray fwbray@mminternet.com
Sent: Monday, June 21, 2021 7:21 PM
To: time-nuts@lists.febo.com
Subject: [time-nuts] Z3801A Receiver Replacement

I have a HP Z3801A with a dead GPS receiver. I understand that it is possible to drop in an Oncore VP 8 channel receiver as a replacement -- not withstanding the fact that the Z3801A will only see six channels.

I see that Motorola R5122U1154 8 channel receivers are available. Does anyone know whether this will function in the Z3801A? I'd like to get it working again.

Thanks.

Fred Bray, KE6CD

Art, Thanks for the info. Please do put me on the list for updates. Fred > On Jun 21, 2021, at 8:55 PM, Art Sepin <art@synergy-gps.com> wrote: > > Hi Fred, > > I apologize if the following smells overtly commercial; it's only intended to answer your questions and explain where we are in the process of producing GPS replacement products for legacy timing instruments. > > The 6 and 8 channel Motorola VP and 8 channel UT+ will not work as replacements. Those products have also reached their 1024 Week-Roll Over limits. The HP Z3801A and Z3805A products only respond to 6 channel commands and produce 6 channel reply messages. > > We have developed single-board clones for the Motorola VP and UT+ products, as drop-in replacements, that are lower in cost than Synergy's 2-board Adaptor Board products (Shooting for dropping to less than $190 if component prices don't go even higher!). The SSR-VP can plug into the HP Z3801A and Z3805A products. > > A different part number SSR-VP designed to drop into HP 58503A and an SSR-UT+, designed to drop into HP 58503B products, have also been completed but firmware for those have yet to be tested in actual instruments. With the proper firmware loads, the SSR Drop-In products should be candidates for upgrading many other legacy timing instruments. > > We had planned for the single board "Drop-In" products to be available near the end of 2020 but COVID-19 changed things for us. We are now planning a small production run to satisfy folks that have already been in touch with us but we need to complete our boot-loader for firmware updates first. With current work load, I'd estimate 90 - 120 days for HP Z3801A and Z3805A replacements. If you are interested we can put you on our list. > > Apologies for the quasi-commercial intrusion! > > Art > > > -----Original Message----- > From: Frederick Bray <fwbray@mminternet.com> > Sent: Monday, June 21, 2021 7:21 PM > To: time-nuts@lists.febo.com > Subject: [time-nuts] Z3801A Receiver Replacement > > I have a HP Z3801A with a dead GPS receiver. I understand that it is possible to drop in an Oncore VP 8 channel receiver as a replacement -- not withstanding the fact that the Z3801A will only see six channels. > > I see that Motorola R5122U1154 8 channel receivers are available. Does anyone know whether this will function in the Z3801A? I'd like to get it working again. > > Thanks. > > Fred Bray, KE6CD > > > > ______________________

JB

Jan Boutsen

Tue, Jun 22, 2021 4:27 AM

Art,

Thanks for the info. Please do put me on the list for updates.

Jan ON4MMW

-----Original Message-----
From: Art Sepin art@synergy-gps.com
Sent: Tuesday, June 22, 2021 5:54 AM
To: Discussion of precise time and frequency measurement time-nuts@lists.febo.com
Subject: [time-nuts] Re: Z3801A Receiver Replacement

Hi Fred,

I apologize if the following smells overtly commercial; it's only intended to answer your questions and explain where we are in the process of producing GPS replacement products for legacy timing instruments.

The 6 and 8 channel Motorola VP and 8 channel UT+ will not work as replacements. Those products have also reached their 1024 Week-Roll Over limits. The HP Z3801A and Z3805A products only respond to 6 channel commands and produce 6 channel reply messages.

We have developed single-board clones for the Motorola VP and UT+ products, as drop-in replacements, that are lower in cost than Synergy's 2-board Adaptor Board products (Shooting for dropping to less than $190 if component prices don't go even higher!). The SSR-VP can plug into the HP Z3801A and Z3805A products.

A different part number SSR-VP designed to drop into HP 58503A and an SSR-UT+, designed to drop into HP 58503B products, have also been completed but firmware for those have yet to be tested in actual instruments. With the proper firmware loads, the SSR Drop-In products should be candidates for upgrading many other legacy timing instruments.

We had planned for the single board "Drop-In" products to be available near the end of 2020 but COVID-19 changed things for us. We are now planning a small production run to satisfy folks that have already been in touch with us but we need to complete our boot-loader for firmware updates first. With current work load, I'd estimate 90 - 120 days for HP Z3801A and Z3805A replacements. If you are interested we can put you on our list.

Apologies for the quasi-commercial intrusion!

Art

-----Original Message-----
From: Frederick Bray fwbray@mminternet.com
Sent: Monday, June 21, 2021 7:21 PM
To: time-nuts@lists.febo.com
Subject: [time-nuts] Z3801A Receiver Replacement

I have a HP Z3801A with a dead GPS receiver. I understand that it is possible to drop in an Oncore VP 8 channel receiver as a replacement -- not withstanding the fact that the Z3801A will only see six channels.

I see that Motorola R5122U1154 8 channel receivers are available. Does anyone know whether this will function in the Z3801A? I'd like to get it working again.

Thanks.

Fred Bray, KE6CD

time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-leave@lists.febo.com To unsubscribe, go to and follow the instructions there.

Art, Thanks for the info. Please do put me on the list for updates. Jan ON4MMW -----Original Message----- From: Art Sepin <art@synergy-gps.com> Sent: Tuesday, June 22, 2021 5:54 AM To: Discussion of precise time and frequency measurement <time-nuts@lists.febo.com> Subject: [time-nuts] Re: Z3801A Receiver Replacement Hi Fred, I apologize if the following smells overtly commercial; it's only intended to answer your questions and explain where we are in the process of producing GPS replacement products for legacy timing instruments. The 6 and 8 channel Motorola VP and 8 channel UT+ will not work as replacements. Those products have also reached their 1024 Week-Roll Over limits. The HP Z3801A and Z3805A products only respond to 6 channel commands and produce 6 channel reply messages. We have developed single-board clones for the Motorola VP and UT+ products, as drop-in replacements, that are lower in cost than Synergy's 2-board Adaptor Board products (Shooting for dropping to less than $190 if component prices don't go even higher!). The SSR-VP can plug into the HP Z3801A and Z3805A products. A different part number SSR-VP designed to drop into HP 58503A and an SSR-UT+, designed to drop into HP 58503B products, have also been completed but firmware for those have yet to be tested in actual instruments. With the proper firmware loads, the SSR Drop-In products should be candidates for upgrading many other legacy timing instruments. We had planned for the single board "Drop-In" products to be available near the end of 2020 but COVID-19 changed things for us. We are now planning a small production run to satisfy folks that have already been in touch with us but we need to complete our boot-loader for firmware updates first. With current work load, I'd estimate 90 - 120 days for HP Z3801A and Z3805A replacements. If you are interested we can put you on our list. Apologies for the quasi-commercial intrusion! Art -----Original Message----- From: Frederick Bray <fwbray@mminternet.com> Sent: Monday, June 21, 2021 7:21 PM To: time-nuts@lists.febo.com Subject: [time-nuts] Z3801A Receiver Replacement I have a HP Z3801A with a dead GPS receiver. I understand that it is possible to drop in an Oncore VP 8 channel receiver as a replacement -- not withstanding the fact that the Z3801A will only see six channels. I see that Motorola R5122U1154 8 channel receivers are available. Does anyone know whether this will function in the Z3801A? I'd like to get it working again. Thanks. Fred Bray, KE6CD _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-leave@lists.febo.com To unsubscribe, go to and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-leave@lists.febo.com To unsubscribe, go to and follow the instructions there.

AS

Art Sepin

Tue, Jun 22, 2021 6:45 PM

Thanks, Jan. You are now on the list.

Art

-----Original Message-----
From: Jan Boutsen jan.boutsen@telenet.be
Sent: Monday, June 21, 2021 9:27 PM
To: 'Discussion of precise time and frequency measurement' time-nuts@lists.febo.com
Cc: 'Jan Boutsen' jan.boutsen@telenet.be; Art Sepin art@synergy-gps.com
Subject: RE: [time-nuts] Re: Z3801A Receiver Replacement

Art,

Thanks for the info. Please do put me on the list for updates.

Jan ON4MMW

-----Original Message-----
From: Art Sepin art@synergy-gps.com
Sent: Tuesday, June 22, 2021 5:54 AM
To: Discussion of precise time and frequency measurement time-nuts@lists.febo.com
Subject: [time-nuts] Re: Z3801A Receiver Replacement

Hi Fred,

I apologize if the following smells overtly commercial; it's only intended to answer your questions and explain where we are in the process of producing GPS replacement products for legacy timing instruments.

The 6 and 8 channel Motorola VP and 8 channel UT+ will not work as replacements. Those products have also reached their 1024 Week-Roll Over limits. The HP Z3801A and Z3805A products only respond to 6 channel commands and produce 6 channel reply messages.

We have developed single-board clones for the Motorola VP and UT+ products, as drop-in replacements, that are lower in cost than Synergy's 2-board Adaptor Board products (Shooting for dropping to less than $190 if component prices don't go even higher!). The SSR-VP can plug into the HP Z3801A and Z3805A products.

A different part number SSR-VP designed to drop into HP 58503A and an SSR-UT+, designed to drop into HP 58503B products, have also been completed but firmware for those have yet to be tested in actual instruments. With the proper firmware loads, the SSR Drop-In products should be candidates for upgrading many other legacy timing instruments.

We had planned for the single board "Drop-In" products to be available near the end of 2020 but COVID-19 changed things for us. We are now planning a small production run to satisfy folks that have already been in touch with us but we need to complete our boot-loader for firmware updates first. With current work load, I'd estimate 90 - 120 days for HP Z3801A and Z3805A replacements. If you are interested we can put you on our list.

Apologies for the quasi-commercial intrusion!

Art

-----Original Message-----
From: Frederick Bray fwbray@mminternet.com
Sent: Monday, June 21, 2021 7:21 PM
To: time-nuts@lists.febo.com
Subject: [time-nuts] Z3801A Receiver Replacement

I have a HP Z3801A with a dead GPS receiver. I understand that it is possible to drop in an Oncore VP 8 channel receiver as a replacement -- not withstanding the fact that the Z3801A will only see six channels.

I see that Motorola R5122U1154 8 channel receivers are available. Does anyone know whether this will function in the Z3801A? I'd like to get it working again.

Thanks.

Fred Bray, KE6CD

time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-leave@lists.febo.com To unsubscribe, go to and follow the instructions there.

Thanks, Jan. You are now on the list. Art -----Original Message----- From: Jan Boutsen <jan.boutsen@telenet.be> Sent: Monday, June 21, 2021 9:27 PM To: 'Discussion of precise time and frequency measurement' <time-nuts@lists.febo.com> Cc: 'Jan Boutsen' <jan.boutsen@telenet.be>; Art Sepin <art@synergy-gps.com> Subject: RE: [time-nuts] Re: Z3801A Receiver Replacement Art, Thanks for the info. Please do put me on the list for updates. Jan ON4MMW -----Original Message----- From: Art Sepin <art@synergy-gps.com> Sent: Tuesday, June 22, 2021 5:54 AM To: Discussion of precise time and frequency measurement <time-nuts@lists.febo.com> Subject: [time-nuts] Re: Z3801A Receiver Replacement Hi Fred, I apologize if the following smells overtly commercial; it's only intended to answer your questions and explain where we are in the process of producing GPS replacement products for legacy timing instruments. The 6 and 8 channel Motorola VP and 8 channel UT+ will not work as replacements. Those products have also reached their 1024 Week-Roll Over limits. The HP Z3801A and Z3805A products only respond to 6 channel commands and produce 6 channel reply messages. We have developed single-board clones for the Motorola VP and UT+ products, as drop-in replacements, that are lower in cost than Synergy's 2-board Adaptor Board products (Shooting for dropping to less than $190 if component prices don't go even higher!). The SSR-VP can plug into the HP Z3801A and Z3805A products. A different part number SSR-VP designed to drop into HP 58503A and an SSR-UT+, designed to drop into HP 58503B products, have also been completed but firmware for those have yet to be tested in actual instruments. With the proper firmware loads, the SSR Drop-In products should be candidates for upgrading many other legacy timing instruments. We had planned for the single board "Drop-In" products to be available near the end of 2020 but COVID-19 changed things for us. We are now planning a small production run to satisfy folks that have already been in touch with us but we need to complete our boot-loader for firmware updates first. With current work load, I'd estimate 90 - 120 days for HP Z3801A and Z3805A replacements. If you are interested we can put you on our list. Apologies for the quasi-commercial intrusion! Art -----Original Message----- From: Frederick Bray <fwbray@mminternet.com> Sent: Monday, June 21, 2021 7:21 PM To: time-nuts@lists.febo.com Subject: [time-nuts] Z3801A Receiver Replacement I have a HP Z3801A with a dead GPS receiver. I understand that it is possible to drop in an Oncore VP 8 channel receiver as a replacement -- not withstanding the fact that the Z3801A will only see six channels. I see that Motorola R5122U1154 8 channel receivers are available. Does anyone know whether this will function in the Z3801A? I'd like to get it working again. Thanks. Fred Bray, KE6CD _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-leave@lists.febo.com To unsubscribe, go to and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-leave@lists.febo.com To unsubscribe, go to and follow the instructions there.

FB

Frederick Bray

Tue, Jun 22, 2021 8:11 PM

Not sure of the nomenclature for the GPS receiver but judging from the size of the board, etc., it seems to be a Motorola. I know that it is 6 channel and apparently uses the Motorola data stream.

Fred Bray

On Jun 22, 2021, at 6:08 AM, Alexandre Souza alexandre.tabajara@gmail.com wrote:

Which one is the original receiver on the Z8301A? I wasn't able to quickly
google this info :\

---8<---Corte aqui---8<---
http://www.tabajara-labs.blogspot.com
http://www.tabalabs.com.br
---8<---Corte aqui---8<---

Em seg., 21 de jun. de 2021 às 23:21, Frederick Bray fwbray@mminternet.com
escreveu:

I have a HP Z3801A with a dead GPS receiver. I understand that it is
possible to drop in an Oncore VP 8 channel receiver as a replacement --
not withstanding the fact that the Z3801A will only see six channels.

I see that Motorola R5122U1154 8 channel receivers are available. Does
anyone know whether this will function in the Z3801A? I'd like to get
it working again.

Thanks.

Fred Bray, KE6CD

time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send
an email to time-nuts-leave@lists.febo.com
To unsubscribe, go to and follow the instructions there.

time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-leave@lists.febo.com
To unsubscribe, go to and follow the instructions there.

Not sure of the nomenclature for the GPS receiver but judging from the size of the board, etc., it seems to be a Motorola. I know that it is 6 channel and apparently uses the Motorola data stream. Fred Bray > On Jun 22, 2021, at 6:08 AM, Alexandre Souza <alexandre.tabajara@gmail.com> wrote: > > Which one is the original receiver on the Z8301A? I wasn't able to quickly > google this info :\ > > ---8<---Corte aqui---8<--- > http://www.tabajara-labs.blogspot.com > http://www.tabalabs.com.br > ---8<---Corte aqui---8<--- > > >> Em seg., 21 de jun. de 2021 às 23:21, Frederick Bray <fwbray@mminternet.com> >> escreveu: >> >> I have a HP Z3801A with a dead GPS receiver. I understand that it is >> possible to drop in an Oncore VP 8 channel receiver as a replacement -- >> not withstanding the fact that the Z3801A will only see six channels. >> >> I see that Motorola R5122U1154 8 channel receivers are available. Does >> anyone know whether this will function in the Z3801A? I'd like to get >> it working again. >> >> Thanks. >> >> Fred Bray, KE6CD >> >> >> >> _______________________________________________ >> time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send >> an email to time-nuts-leave@lists.febo.com >> To unsubscribe, go to and follow the instructions there. > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-leave@lists.febo.com > To unsubscribe, go to and follow the instructions there.

RD

Robert DiRosario

Tue, Jun 22, 2021 8:49 PM

Does this effect All Z3801As?
I have one of these:
http://www.realhamradio.com/GPS_Frequency_Standard.htm
I picked up a power supply and antenna for it but haven't done anything
with it yet.

I have a HP Z3801A with a dead GPS receiver.

Is it dead because of Week-Roll over limits or something else?

Robert

On 06/21/2021 11:54 PM, Art Sepin wrote:

Hi Fred,

I apologize if the following smells overtly commercial; it's only intended to answer your questions and explain where we are in the process of producing GPS replacement products for legacy timing instruments.

The 6 and 8 channel Motorola VP and 8 channel UT+ will not work as replacements. Those products have also reached their 1024 Week-Roll Over limits. The HP Z3801A and Z3805A products only respond to 6 channel commands and produce 6 channel reply messages.

We have developed single-board clones for the Motorola VP and UT+ products, as drop-in replacements, that are lower in cost than Synergy's 2-board Adaptor Board products (Shooting for dropping to less than $190 if component prices don't go even higher!). The SSR-VP can plug into the HP Z3801A and Z3805A products.

A different part number SSR-VP designed to drop into HP 58503A and an SSR-UT+, designed to drop into HP 58503B products, have also been completed but firmware for those have yet to be tested in actual instruments. With the proper firmware loads, the SSR Drop-In products should be candidates for upgrading many other legacy timing instruments.

We had planned for the single board "Drop-In" products to be available near the end of 2020 but COVID-19 changed things for us. We are now planning a small production run to satisfy folks that have already been in touch with us but we need to complete our boot-loader for firmware updates first. With current work load, I'd estimate 90 - 120 days for HP Z3801A and Z3805A replacements. If you are interested we can put you on our list.

Apologies for the quasi-commercial intrusion!

Art

-----Original Message-----
From: Frederick Bray fwbray@mminternet.com
Sent: Monday, June 21, 2021 7:21 PM
To: time-nuts@lists.febo.com
Subject: [time-nuts] Z3801A Receiver Replacement

I have a HP Z3801A with a dead GPS receiver. I understand that it is possible to drop in an Oncore VP 8 channel receiver as a replacement -- not withstanding the fact that the Z3801A will only see six channels.

I see that Motorola R5122U1154 8 channel receivers are available. Does anyone know whether this will function in the Z3801A? I'd like to get it working again.

Thanks.

Fred Bray, KE6CD

time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-leave@lists.febo.com To unsubscribe, go to and follow the instructions there.

time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-leave@lists.febo.com
To unsubscribe, go to and follow the instructions there.

Does this effect All Z3801As? I have one of these: http://www.realhamradio.com/GPS_Frequency_Standard.htm I picked up a power supply and antenna for it but haven't done anything with it yet. > I have a HP Z3801A with a dead GPS receiver. Is it dead because of Week-Roll over limits or something else? Robert On 06/21/2021 11:54 PM, Art Sepin wrote: > Hi Fred, > > I apologize if the following smells overtly commercial; it's only intended to answer your questions and explain where we are in the process of producing GPS replacement products for legacy timing instruments. > > The 6 and 8 channel Motorola VP and 8 channel UT+ will not work as replacements. Those products have also reached their 1024 Week-Roll Over limits. The HP Z3801A and Z3805A products only respond to 6 channel commands and produce 6 channel reply messages. > > We have developed single-board clones for the Motorola VP and UT+ products, as drop-in replacements, that are lower in cost than Synergy's 2-board Adaptor Board products (Shooting for dropping to less than $190 if component prices don't go even higher!). The SSR-VP can plug into the HP Z3801A and Z3805A products. > > A different part number SSR-VP designed to drop into HP 58503A and an SSR-UT+, designed to drop into HP 58503B products, have also been completed but firmware for those have yet to be tested in actual instruments. With the proper firmware loads, the SSR Drop-In products should be candidates for upgrading many other legacy timing instruments. > > We had planned for the single board "Drop-In" products to be available near the end of 2020 but COVID-19 changed things for us. We are now planning a small production run to satisfy folks that have already been in touch with us but we need to complete our boot-loader for firmware updates first. With current work load, I'd estimate 90 - 120 days for HP Z3801A and Z3805A replacements. If you are interested we can put you on our list. > > Apologies for the quasi-commercial intrusion! > > Art > > > -----Original Message----- > From: Frederick Bray <fwbray@mminternet.com> > Sent: Monday, June 21, 2021 7:21 PM > To: time-nuts@lists.febo.com > Subject: [time-nuts] Z3801A Receiver Replacement > > I have a HP Z3801A with a dead GPS receiver. I understand that it is possible to drop in an Oncore VP 8 channel receiver as a replacement -- not withstanding the fact that the Z3801A will only see six channels. > > I see that Motorola R5122U1154 8 channel receivers are available. Does anyone know whether this will function in the Z3801A? I'd like to get it working again. > > Thanks. > > Fred Bray, KE6CD > > > > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-leave@lists.febo.com To unsubscribe, go to and follow the instructions there. > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-leave@lists.febo.com > To unsubscribe, go to and follow the instructions there.

FB

Frederick Bray

Tue, Jun 22, 2021 10:23 PM

Probably not dead from the rollover issue as I can’t talk to the receiver via the serial port.

Fred Bray

On Jun 22, 2021, at 2:59 PM, Robert DiRosario ka3zyx@comcast.net wrote:

Does this effect All Z3801As?
I have one of these:
http://www.realhamradio.com/GPS_Frequency_Standard.htm
I picked up a power supply and antenna for it but haven't done anything with it yet.

I have a HP Z3801A with a dead GPS receiver.

Is it dead because of Week-Roll over limits or something else?

Robert

On 06/21/2021 11:54 PM, Art Sepin wrote:
Hi Fred,

I apologize if the following smells overtly commercial; it's only intended to answer your questions and explain where we are in the process of producing GPS replacement products for legacy timing instruments.

The 6 and 8 channel Motorola VP and 8 channel UT+ will not work as replacements. Those products have also reached their 1024 Week-Roll Over limits. The HP Z3801A and Z3805A products only respond to 6 channel commands and produce 6 channel reply messages.

We have developed single-board clones for the Motorola VP and UT+ products, as drop-in replacements, that are lower in cost than Synergy's 2-board Adaptor Board products (Shooting for dropping to less than $190 if component prices don't go even higher!). The SSR-VP can plug into the HP Z3801A and Z3805A products.

A different part number SSR-VP designed to drop into HP 58503A and an SSR-UT+, designed to drop into HP 58503B products, have also been completed but firmware for those have yet to be tested in actual instruments. With the proper firmware loads, the SSR Drop-In products should be candidates for upgrading many other legacy timing instruments.

We had planned for the single board "Drop-In" products to be available near the end of 2020 but COVID-19 changed things for us. We are now planning a small production run to satisfy folks that have already been in touch with us but we need to complete our boot-loader for firmware updates first. With current work load, I'd estimate 90 - 120 days for HP Z3801A and Z3805A replacements. If you are interested we can put you on our list.

Apologies for the quasi-commercial intrusion!

Art

-----Original Message-----
From: Frederick Bray fwbray@mminternet.com
Sent: Monday, June 21, 2021 7:21 PM
To: time-nuts@lists.febo.com
Subject: [time-nuts] Z3801A Receiver Replacement

I have a HP Z3801A with a dead GPS receiver. I understand that it is possible to drop in an Oncore VP 8 channel receiver as a replacement -- not withstanding the fact that the Z3801A will only see six channels.

I see that Motorola R5122U1154 8 channel receivers are available. Does anyone know whether this will function in the Z3801A? I'd like to get it working again.

Thanks.

Fred Bray, KE6CD

time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-leave@lists.febo.com To unsubscribe, go to and follow the instructions there.

time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-leave@lists.febo.com
To unsubscribe, go to and follow the instructions there.

Probably not dead from the rollover issue as I can’t talk to the receiver via the serial port. Fred Bray > On Jun 22, 2021, at 2:59 PM, Robert DiRosario <ka3zyx@comcast.net> wrote: > > Does this effect All Z3801As? > I have one of these: > http://www.realhamradio.com/GPS_Frequency_Standard.htm > I picked up a power supply and antenna for it but haven't done anything with it yet. > > > I have a HP Z3801A with a dead GPS receiver. > Is it dead because of Week-Roll over limits or something else? > > Robert > > >> On 06/21/2021 11:54 PM, Art Sepin wrote: >> Hi Fred, >> >> I apologize if the following smells overtly commercial; it's only intended to answer your questions and explain where we are in the process of producing GPS replacement products for legacy timing instruments. >> >> The 6 and 8 channel Motorola VP and 8 channel UT+ will not work as replacements. Those products have also reached their 1024 Week-Roll Over limits. The HP Z3801A and Z3805A products only respond to 6 channel commands and produce 6 channel reply messages. >> >> We have developed single-board clones for the Motorola VP and UT+ products, as drop-in replacements, that are lower in cost than Synergy's 2-board Adaptor Board products (Shooting for dropping to less than $190 if component prices don't go even higher!). The SSR-VP can plug into the HP Z3801A and Z3805A products. >> >> A different part number SSR-VP designed to drop into HP 58503A and an SSR-UT+, designed to drop into HP 58503B products, have also been completed but firmware for those have yet to be tested in actual instruments. With the proper firmware loads, the SSR Drop-In products should be candidates for upgrading many other legacy timing instruments. >> >> We had planned for the single board "Drop-In" products to be available near the end of 2020 but COVID-19 changed things for us. We are now planning a small production run to satisfy folks that have already been in touch with us but we need to complete our boot-loader for firmware updates first. With current work load, I'd estimate 90 - 120 days for HP Z3801A and Z3805A replacements. If you are interested we can put you on our list. >> >> Apologies for the quasi-commercial intrusion! >> >> Art >> >> >> -----Original Message----- >> From: Frederick Bray <fwbray@mminternet.com> >> Sent: Monday, June 21, 2021 7:21 PM >> To: time-nuts@lists.febo.com >> Subject: [time-nuts] Z3801A Receiver Replacement >> >> I have a HP Z3801A with a dead GPS receiver. I understand that it is possible to drop in an Oncore VP 8 channel receiver as a replacement -- not withstanding the fact that the Z3801A will only see six channels. >> >> I see that Motorola R5122U1154 8 channel receivers are available. Does anyone know whether this will function in the Z3801A? I'd like to get it working again. >> >> Thanks. >> >> Fred Bray, KE6CD >> >> >> >> _______________________________________________ >> time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-leave@lists.febo.com To unsubscribe, go to and follow the instructions there. >> _______________________________________________ >> time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-leave@lists.febo.com >> To unsubscribe, go to and follow the instructions there. > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-leave@lists.febo.com > To unsubscribe, go to and follow the instructions there.

AS

Art Sepin

Thu, Jun 24, 2021 1:22 AM

Robert,

Is it dead because of Week-Roll over limits or something else?

It is a Week Roll-Over limit. In a working receiver, the time should be correct with 3-D fix (min) but the date will be wrong. Some VP and UT+ Oncore receivers may have failed but we have found that to be very rare.

Art

P.S. We use SafeLinks protection for our e-mail so it adds many additional characters while the mail is being tested for virus, etc. in it's sand box.

-----Original Message-----
From: Robert DiRosario ka3zyx@comcast.net
Sent: Tuesday, June 22, 2021 1:49 PM
To: time-nuts@lists.febo.com
Subject: [time-nuts] Re: Z3801A Receiver Replacement

Does this effect All Z3801As?
I have one of these:
https://nam04.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.realhamradio.com%2FGPS_Frequency_Standard.htm&data=04%7C01%7Cart%40synergy-gps.com%7C9aec8b93f8564034a80a08d935c8ce5c%7Cc81f9fdec0e04d8c95779afaa0cad9ed%7C1%7C0%7C637599958847941854%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=N%2Fv%2B8URtNzXTNriy92U9kAuYLDhIufaHIq2%2BClC5qC8%3D&reserved=0
I picked up a power supply and antenna for it but haven't done anything with it yet.

I have a HP Z3801A with a dead GPS receiver.

Is it dead because of Week-Roll over limits or something else?

Robert

On 06/21/2021 11:54 PM, Art Sepin wrote:

Hi Fred,

I apologize if the following smells overtly commercial; it's only intended to answer your questions and explain where we are in the process of producing GPS replacement products for legacy timing instruments.

The 6 and 8 channel Motorola VP and 8 channel UT+ will not work as replacements. Those products have also reached their 1024 Week-Roll Over limits. The HP Z3801A and Z3805A products only respond to 6 channel commands and produce 6 channel reply messages.

We have developed single-board clones for the Motorola VP and UT+ products, as drop-in replacements, that are lower in cost than Synergy's 2-board Adaptor Board products (Shooting for dropping to less than $190 if component prices don't go even higher!). The SSR-VP can plug into the HP Z3801A and Z3805A products.

A different part number SSR-VP designed to drop into HP 58503A and an SSR-UT+, designed to drop into HP 58503B products, have also been completed but firmware for those have yet to be tested in actual instruments. With the proper firmware loads, the SSR Drop-In products should be candidates for upgrading many other legacy timing instruments.

We had planned for the single board "Drop-In" products to be available near the end of 2020 but COVID-19 changed things for us. We are now planning a small production run to satisfy folks that have already been in touch with us but we need to complete our boot-loader for firmware updates first. With current work load, I'd estimate 90 - 120 days for HP Z3801A and Z3805A replacements. If you are interested we can put you on our list.

Apologies for the quasi-commercial intrusion!

Art

-----Original Message-----
From: Frederick Bray fwbray@mminternet.com
Sent: Monday, June 21, 2021 7:21 PM
To: time-nuts@lists.febo.com
Subject: [time-nuts] Z3801A Receiver Replacement

I have a HP Z3801A with a dead GPS receiver. I understand that it is possible to drop in an Oncore VP 8 channel receiver as a replacement -- not withstanding the fact that the Z3801A will only see six channels.

I see that Motorola R5122U1154 8 channel receivers are available. Does anyone know whether this will function in the Z3801A? I'd like to get it working again.

Thanks.

Fred Bray, KE6CD

time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-leave@lists.febo.com To unsubscribe, go to and follow the instructions there.

time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe
send an email to time-nuts-leave@lists.febo.com To unsubscribe, go to and follow the instructions there.

time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-leave@lists.febo.com To unsubscribe, go to and follow the instructions there.

Robert, > Is it dead because of Week-Roll over limits or something else? It is a Week Roll-Over limit. In a working receiver, the time should be correct with 3-D fix (min) but the date will be wrong. Some VP and UT+ Oncore receivers may have failed but we have found that to be very rare. Art P.S. We use SafeLinks protection for our e-mail so it adds many additional characters while the mail is being tested for virus, etc. in it's sand box. -----Original Message----- From: Robert DiRosario <ka3zyx@comcast.net> Sent: Tuesday, June 22, 2021 1:49 PM To: time-nuts@lists.febo.com Subject: [time-nuts] Re: Z3801A Receiver Replacement Does this effect All Z3801As? I have one of these: https://nam04.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.realhamradio.com%2FGPS_Frequency_Standard.htm&data=04%7C01%7Cart%40synergy-gps.com%7C9aec8b93f8564034a80a08d935c8ce5c%7Cc81f9fdec0e04d8c95779afaa0cad9ed%7C1%7C0%7C637599958847941854%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=N%2Fv%2B8URtNzXTNriy92U9kAuYLDhIufaHIq2%2BClC5qC8%3D&reserved=0 I picked up a power supply and antenna for it but haven't done anything with it yet. > I have a HP Z3801A with a dead GPS receiver. Is it dead because of Week-Roll over limits or something else? Robert On 06/21/2021 11:54 PM, Art Sepin wrote: > Hi Fred, > > I apologize if the following smells overtly commercial; it's only intended to answer your questions and explain where we are in the process of producing GPS replacement products for legacy timing instruments. > > The 6 and 8 channel Motorola VP and 8 channel UT+ will not work as replacements. Those products have also reached their 1024 Week-Roll Over limits. The HP Z3801A and Z3805A products only respond to 6 channel commands and produce 6 channel reply messages. > > We have developed single-board clones for the Motorola VP and UT+ products, as drop-in replacements, that are lower in cost than Synergy's 2-board Adaptor Board products (Shooting for dropping to less than $190 if component prices don't go even higher!). The SSR-VP can plug into the HP Z3801A and Z3805A products. > > A different part number SSR-VP designed to drop into HP 58503A and an SSR-UT+, designed to drop into HP 58503B products, have also been completed but firmware for those have yet to be tested in actual instruments. With the proper firmware loads, the SSR Drop-In products should be candidates for upgrading many other legacy timing instruments. > > We had planned for the single board "Drop-In" products to be available near the end of 2020 but COVID-19 changed things for us. We are now planning a small production run to satisfy folks that have already been in touch with us but we need to complete our boot-loader for firmware updates first. With current work load, I'd estimate 90 - 120 days for HP Z3801A and Z3805A replacements. If you are interested we can put you on our list. > > Apologies for the quasi-commercial intrusion! > > Art > > > -----Original Message----- > From: Frederick Bray <fwbray@mminternet.com> > Sent: Monday, June 21, 2021 7:21 PM > To: time-nuts@lists.febo.com > Subject: [time-nuts] Z3801A Receiver Replacement > > I have a HP Z3801A with a dead GPS receiver. I understand that it is possible to drop in an Oncore VP 8 channel receiver as a replacement -- not withstanding the fact that the Z3801A will only see six channels. > > I see that Motorola R5122U1154 8 channel receivers are available. Does anyone know whether this will function in the Z3801A? I'd like to get it working again. > > Thanks. > > Fred Bray, KE6CD > > > > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-leave@lists.febo.com To unsubscribe, go to and follow the instructions there. > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe > send an email to time-nuts-leave@lists.febo.com To unsubscribe, go to and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-leave@lists.febo.com To unsubscribe, go to and follow the instructions there.