The Z3805A utilizes Carrier to Noise C/N instead of Signal Strength.  Typical values of C/N are 25 - 55 whereas Signal Strength can range from ~30 - 255. Chuck Zabilski BD Systems, Inc. ________________________________ From: "time-nuts-request@febo.com" <time-nuts-request@febo.com> To: time-nuts@febo.com Sent: Sunday, November 11, 2012 1:53 PM Subject: time-nuts Digest, Vol 100, Issue 38 Send time-nuts mailing list submissions to     time-nuts@febo.com To subscribe or unsubscribe via the World Wide Web, visit     https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts or, via email, send a message with subject or body 'help' to     time-nuts-request@febo.com You can reach the person managing the list at     time-nuts-owner@febo.com When replying, please edit your Subject line so it is more specific than "Re: Contents of time-nuts digest..." Today's Topics:   1. Re: Z3805 hold-Over (jmfranke)   2. Re: Z3805 hold-Over (Doug Parker)   3. Re: Z3805 hold-Over (Volker Esper)   4. Re: Z3805 hold-Over (Volker Esper)   5. Re: Z3805 hold-Over (Bob Camp)   6. Re: Z3805 hold-Over (Bob Camp) ---------------------------------------------------------------------- Message: 1 Date: Sun, 11 Nov 2012 14:04:15 -0500 From: "jmfranke" <jmfranke@cox.net> To: "Doug Parker" <doug.parker@btinternet.com>,    <time-nuts@febo.com> Subject: Re: [time-nuts] Z3805 hold-Over Message-ID: <DC6BAEDBFD0747039B478B94F2E3A837@Franke> Content-Type: text/plain; format=flowed; charset="iso-8859-1";     reply-type=original Your 21 ns for 1PPS and T1 does not look too bad, but the satellite received signal strengths are too low. You should have at least four or five SS values above 60-80. I always have at least three SS readings above 100. My Holdover runs between 03 and 4 microseconds. John  WA4WDL -------------------------------------------------- From: "Doug Parker" <doug.parker@btinternet.com> Sent: Sunday, November 11, 2012 1:36 PM To: <time-nuts@febo.com> Subject: Re: [time-nuts] Z3805 hold-Over > > > > Hi, > > I've got a Z3805 from one of the Chineese sources and had problems with > the HP 11801 oscillator which came with it. Even after a couple of weeks > operartion it was moving vast EFC voltages with the 'Holdover Uncertainty > Predict' reaching a lowest of 19uS. > > So I tried the HP oscillator from my Z3801 in the Z3805 and the daily EFC > change is back to a resonable level, but after 5 days of settling down, > the 'Holdeover Uncertainy Predict' has only got down to 10uS.and is > holding about that value. > > Could some one please advise what figures they are getting. As there's > something sticking in my mind that the whole system should be lower than > 6.3uS after 3 days of locked operation. Or have I been dreaming..... > > I have attached a JPG of my GPSCon graph, hope it helps > > thanks & 73s > Doug > G4DZU > http://www.g4dzu.com/ > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. ------------------------------ Message: 2 Date: Sun, 11 Nov 2012 19:24:20 +0000 (GMT) From: Doug Parker <doug.parker@btinternet.com> To: jmfranke <jmfranke@cox.net>, "time-nuts@febo.com"     <time-nuts@febo.com> Subject: Re: [time-nuts] Z3805 hold-Over Message-ID:     <1352661860.17054.YahooMailNeo@web87704.mail.ir2.yahoo.com> Content-Type: text/plain; charset=iso-8859-1 Hi John, ? Thanks for the observation, with the same antenna plugged into my Z3801, I get an SS of at least 90. ? I'll place a preamp in line to see if that increases the SS on the 3805 , maybe my problem is the GPS RX isn't well. Great point. ? Of course, ?I'll watch out for the 5V power feed going up the coax for the preamp in the antenna. ? 73s Doug G4DZU ________________________________ From: jmfranke <jmfranke@cox.net> To: Doug Parker <doug.parker@btinternet.com>; time-nuts@febo.com Sent: Sunday, 11 November 2012, 19:04 Subject: Re: [time-nuts] Z3805 hold-Over   Your 21 ns for 1PPS and T1 does not look too bad, but the satellite received signal strengths are too low. You should have at least four or five SS values above 60-80. I always have at least three SS readings above 100. My Holdover runs between 03 and 4 microseconds. John? WA4WDL -------------------------------------------------- From: "Doug Parker" <doug.parker@btinternet.com> Sent: Sunday, November 11, 2012 1:36 PM To: <time-nuts@febo.com> Subject: Re: [time-nuts] Z3805 hold-Over > > > > Hi, > > I've got a Z3805 from one of the Chineese sources and had problems with the HP 11801 oscillator which came with it. Even after a couple of weeks operartion it was moving vast EFC voltages with the 'Holdover Uncertainty Predict' reaching a lowest of 19uS. > > So I tried the HP oscillator from my Z3801 in the Z3805 and the daily EFC change is back to a resonable level, but after 5 days of settling down, the 'Holdeover Uncertainy Predict' has only got down to 10uS.and is holding about that value. > > Could some one please advise what figures they are getting. As there's something sticking in my mind that the whole system should be lower than 6.3uS after 3 days of locked operation. Or have I been dreaming..... > > I have attached a JPG of my GPSCon graph, hope it helps > > thanks & 73s > Doug > G4DZU > http://www.g4dzu.com/ > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. ------------------------------ Message: 3 Date: Sun, 11 Nov 2012 20:29:11 +0100 From: Volker Esper <ailer2@t-online.de> To: Discussion of precise time and frequency measurement     <time-nuts@febo.com> Subject: Re: [time-nuts] Z3805 hold-Over Message-ID: <509FFC87.3090609@t-online.de> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Yes, I guess, signal strength is essential. My holdover uncertainty is (after 1 weeks) about 1 to 2us. Volker DF9PL Am 11.11.2012 20:04, schrieb jmfranke: > Your 21 ns for 1PPS and T1 does not look too bad, but the satellite > received signal strengths are too low. You should have at least four or > five SS values above 60-80. I always have at least three SS readings > above 100. My Holdover runs between 03 and 4 microseconds. > > John WA4WDL > > -------------------------------------------------- > From: "Doug Parker" <doug.parker@btinternet.com> > Sent: Sunday, November 11, 2012 1:36 PM > To: <time-nuts@febo.com> > Subject: Re: [time-nuts] Z3805 hold-Over > >> >> >> >> Hi, >> >> I've got a Z3805 from one of the Chineese sources and had problems >> with the HP 11801 oscillator which came with it. Even after a couple >> of weeks operartion it was moving vast EFC voltages with the 'Holdover >> Uncertainty Predict' reaching a lowest of 19uS. >> >> So I tried the HP oscillator from my Z3801 in the Z3805 and the daily >> EFC change is back to a resonable level, but after 5 days of settling >> down, the 'Holdeover Uncertainy Predict' has only got down to 10uS.and >> is holding about that value. >> >> Could some one please advise what figures they are getting. As there's >> something sticking in my mind that the whole system should be lower >> than 6.3uS after 3 days of locked operation. Or have I been dreaming..... >> >> I have attached a JPG of my GPSCon graph, hope it helps >> >> thanks & 73s >> Doug >> G4DZU >> http://www.g4dzu.com/ > > > >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. > > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > ------------------------------ Message: 4 Date: Sun, 11 Nov 2012 20:33:56 +0100 From: Volker Esper <ailer2@t-online.de> To: Doug Parker <doug.parker@btinternet.com>,     Discussion of precise     time and frequency measurement <time-nuts@febo.com> Subject: Re: [time-nuts] Z3805 hold-Over Message-ID: <509FFDA4.9050902@t-online.de> Content-Type: text/plain; charset=ISO-8859-1; format=flowed You can easily check the 5V by measuring at the open antenna plug. When plugging the antenna, total current consumption should increase by about 10mA or so. Am 11.11.2012 20:24, schrieb Doug Parker: > Hi John, > > Thanks for the observation, with the same antenna plugged into my Z3801, I get an SS of at least 90. > > I'll place a preamp in line to see if that increases the SS on the 3805 , maybe my problem is the GPS RX isn't well. Great point. > > Of course,  I'll watch out for the 5V power feed going up the coax for the preamp in the antenna. > > 73s > Doug > G4DZU > > > ________________________________ >  From: jmfranke<jmfranke@cox.net> > To: Doug Parker<doug.parker@btinternet.com>; time-nuts@febo.com > Sent: Sunday, 11 November 2012, 19:04 > Subject: Re: [time-nuts] Z3805 hold-Over > > Your 21 ns for 1PPS and T1 does not look too bad, but the satellite received signal strengths are too low. You should have at least four or five SS values above 60-80. I always have at least three SS readings above 100. My Holdover runs between 03 and 4 microseconds. > > John  WA4WDL > > -------------------------------------------------- > From: "Doug Parker"<doug.parker@btinternet.com> > Sent: Sunday, November 11, 2012 1:36 PM > To:<time-nuts@febo.com> > Subject: Re: [time-nuts] Z3805 hold-Over > >> >> >> >> Hi, >> >> I've got a Z3805 from one of the Chineese sources and had problems with the HP 11801 oscillator which came with it. Even after a couple of weeks operartion it was moving vast EFC voltages with the 'Holdover Uncertainty Predict' reaching a lowest of 19uS. >> >> So I tried the HP oscillator from my Z3801 in the Z3805 and the daily EFC change is back to a resonable level, but after 5 days of settling down, the 'Holdeover Uncertainy Predict' has only got down to 10uS.and is holding about that value. >> >> Could some one please advise what figures they are getting. As there's something sticking in my mind that the whole system should be lower than 6.3uS after 3 days of locked operation. Or have I been dreaming..... >> >> I have attached a JPG of my GPSCon graph, hope it helps >> >> thanks&  73s >> Doug >> G4DZU >> http://www.g4dzu.com/ > > > >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > ------------------------------ Message: 5 Date: Sun, 11 Nov 2012 15:46:27 -0500 From: Bob Camp <lists@rtty.us> To: Doug Parker <doug.parker@btinternet.com>,    Discussion of precise     time and frequency measurement <time-nuts@febo.com> Subject: Re: [time-nuts] Z3805 hold-Over Message-ID: <9EC6326B-C8DF-4ED3-A1D0-3CBF4E7D31D7@rtty.us> Content-Type: text/plain; charset=iso-8859-1 Hi Most of mine get down to ridiculously low numbers after a few weeks to a few months on. How long seems to depend on how many years the unit has been off power. Any estimate under 500 ns is questionable with that hardware. The firmware seems to be quite happy reporting numbers well below that. Bob On Nov 11, 2012, at 1:36 PM, Doug Parker <doug.parker@btinternet.com> wrote: > >  > > Hi, > > I've got a Z3805 from one of the Chineese sources and had problems with the HP 11801 oscillator which came with it. Even after a couple of weeks  operartion it was moving vast EFC voltages with  the 'Holdover Uncertainty Predict'  reaching a lowest of 19uS. > > So I tried the HP oscillator from my Z3801 in the Z3805 and the daily EFC change is back to a resonable level, but after 5 days of settling down, the 'Holdeover Uncertainy Predict' has only got down to 10uS.and is holding about that value. > > Could some one please advise what figures they are getting. As there's something sticking in my mind that the whole system should be lower than 6.3uS after 3 days of locked operation. Or have I been dreaming..... > > I have attached a JPG of my GPSCon graph, hope it helps > > thanks & 73s > Doug > G4DZU > http://www.g4dzu.com/<3801-5Days.jpg>_______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. ------------------------------ Message: 6 Date: Sun, 11 Nov 2012 15:52:44 -0500 From: Bob Camp <lists@rtty.us> To: Discussion of precise time and frequency measurement     <time-nuts@febo.com> Subject: Re: [time-nuts] Z3805 hold-Over Message-ID: <C9C84563-7B7B-4EEB-BE78-41098B17802C@rtty.us> Content-Type: text/plain; charset=iso-8859-1 Hi You may well over drive the GPS board if you put more amplification in the line. If the antenna and coax work ok with a 3801, they should be fine with a 3805. If you have a very high gain setup, it may be ok for the 3801 and be over driving the 3805 already. What kind of antenna and coax are you using? Bob On Nov 11, 2012, at 2:24 PM, Doug Parker <doug.parker@btinternet.com> wrote: > Hi John, >  > Thanks for the observation, with the same antenna plugged into my Z3801, I get an SS of at least 90. >  > I'll place a preamp in line to see if that increases the SS on the 3805 , maybe my problem is the GPS RX isn't well. Great point. >  > Of course,  I'll watch out for the 5V power feed going up the coax for the preamp in the antenna. >  > 73s > Doug > G4DZU > > > ________________________________ > From: jmfranke <jmfranke@cox.net> > To: Doug Parker <doug.parker@btinternet.com>; time-nuts@febo.com > Sent: Sunday, 11 November 2012, 19:04 > Subject: Re: [time-nuts] Z3805 hold-Over > > Your 21 ns for 1PPS and T1 does not look too bad, but the satellite received signal strengths are too low. You should have at least four or five SS values above 60-80. I always have at least three SS readings above 100. My Holdover runs between 03 and 4 microseconds. > > John  WA4WDL > > -------------------------------------------------- > From: "Doug Parker" <doug.parker@btinternet.com> > Sent: Sunday, November 11, 2012 1:36 PM > To: <time-nuts@febo.com> > Subject: Re: [time-nuts] Z3805 hold-Over > >> >> >> >> Hi, >> >> I've got a Z3805 from one of the Chineese sources and had problems with the HP 11801 oscillator which came with it. Even after a couple of weeks operartion it was moving vast EFC voltages with the 'Holdover Uncertainty Predict' reaching a lowest of 19uS. >> >> So I tried the HP oscillator from my Z3801 in the Z3805 and the daily EFC change is back to a resonable level, but after 5 days of settling down, the 'Holdeover Uncertainy Predict' has only got down to 10uS.and is holding about that value. >> >> Could some one please advise what figures they are getting. As there's something sticking in my mind that the whole system should be lower than 6.3uS after 3 days of locked operation. Or have I been dreaming..... >> >> I have attached a JPG of my GPSCon graph, hope it helps >> >> thanks & 73s >> Doug >> G4DZU >> http://www.g4dzu.com/ > > > >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. ------------------------------ _______________________________________________ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts End of time-nuts Digest, Vol 100, Issue 38 ******************************************

Hi Chuck,   Thank you for the explanation of the SS and C/N modes used in the Z3805A, I hadn't noticed the change in designation on the receiver status. This totally explains the difference in signal reports between my Z3801 & Z3805. Sometimes you can't see the wood for the trees.   With this in mind, it looks like my Z3805 GPS is receiving an acceptable signal with a typical CF of 40+, so back to the drawing board. Or better still, just leave the Z3805A  alone for a month or so and let everything settle and then if neccesary, investigate further.   thanks Doug ________________________________ From: BD Systems Inc. <bdsysco@yahoo.com> To: "time-nuts@febo.com" <time-nuts@febo.com> Sent: Sunday, 11 November 2012, 22:58 Subject: [time-nuts] Z3805 hold-Over The Z3805A utilizes Carrier to Noise C/N instead of Signal Strength.  Typical values of C/N are 25 - 55 whereas Signal Strength can range from ~30 - 255. Chuck Zabilski BD Systems, Inc. ________________________________ From: "time-nuts-request@febo.com" <time-nuts-request@febo.com> To: time-nuts@febo.com Sent: Sunday, November 11, 2012 1:53 PM Subject: time-nuts Digest, Vol 100, Issue 38   Send time-nuts mailing list submissions to     time-nuts@febo.com To subscribe or unsubscribe via the World Wide Web, visit     https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts or, via email, send a message with subject or body 'help' to     time-nuts-request@febo.com You can reach the person managing the list at     time-nuts-owner@febo.com When replying, please edit your Subject line so it is more specific than "Re: Contents of time-nuts digest..." Today's Topics:    1. Re: Z3805 hold-Over (jmfranke)    2. Re: Z3805 hold-Over (Doug Parker)    3. Re: Z3805 hold-Over (Volker Esper)    4. Re: Z3805 hold-Over (Volker Esper)    5. Re: Z3805 hold-Over (Bob Camp)    6. Re: Z3805 hold-Over (Bob Camp) ---------------------------------------------------------------------- Message: 1 Date: Sun, 11 Nov 2012 14:04:15 -0500 From: "jmfranke" <jmfranke@cox.net> To: "Doug Parker" <doug.parker@btinternet.com>,    <time-nuts@febo.com> Subject: Re: [time-nuts] Z3805 hold-Over Message-ID: <DC6BAEDBFD0747039B478B94F2E3A837@Franke> Content-Type: text/plain; format=flowed; charset="iso-8859-1";     reply-type=original Your 21 ns for 1PPS and T1 does not look too bad, but the satellite received signal strengths are too low. You should have at least four or five SS values above 60-80. I always have at least three SS readings above 100. My Holdover runs between 03 and 4 microseconds. John  WA4WDL -------------------------------------------------- From: "Doug Parker" <doug.parker@btinternet.com> Sent: Sunday, November 11, 2012 1:36 PM To: <time-nuts@febo.com> Subject: Re: [time-nuts] Z3805 hold-Over > > > > Hi, > > I've got a Z3805 from one of the Chineese sources and had problems with > the HP 11801 oscillator which came with it. Even after a couple of weeks > operartion it was moving vast EFC voltages with the 'Holdover Uncertainty > Predict' reaching a lowest of 19uS. > > So I tried the HP oscillator from my Z3801 in the Z3805 and the daily EFC > change is back to a resonable level, but after 5 days of settling down, > the 'Holdeover Uncertainy Predict' has only got down to 10uS.and is > holding about that value. > > Could some one please advise what figures they are getting. As there's > something sticking in my mind that the whole system should be lower than > 6.3uS after 3 days of locked operation. Or have I been dreaming..... > > I have attached a JPG of my GPSCon graph, hope it helps > > thanks & 73s > Doug > G4DZU > http://www.g4dzu.com/ > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. ------------------------------ Message: 2 Date: Sun, 11 Nov 2012 19:24:20 +0000 (GMT) From: Doug Parker <doug.parker@btinternet.com> To: jmfranke <jmfranke@cox.net>, "time-nuts@febo.com"     <time-nuts@febo.com> Subject: Re: [time-nuts] Z3805 hold-Over Message-ID:     <1352661860.17054.YahooMailNeo@web87704.mail.ir2.yahoo.com> Content-Type: text/plain; charset=iso-8859-1 Hi John, ? Thanks for the observation, with the same antenna plugged into my Z3801, I get an SS of at least 90. ? I'll place a preamp in line to see if that increases the SS on the 3805 , maybe my problem is the GPS RX isn't well. Great point. ? Of course, ?I'll watch out for the 5V power feed going up the coax for the preamp in the antenna. ? 73s Doug G4DZU ________________________________ From: jmfranke <jmfranke@cox.net> To: Doug Parker <doug.parker@btinternet.com>; time-nuts@febo.com Sent: Sunday, 11 November 2012, 19:04 Subject: Re: [time-nuts] Z3805 hold-Over   Your 21 ns for 1PPS and T1 does not look too bad, but the satellite received signal strengths are too low. You should have at least four or five SS values above 60-80. I always have at least three SS readings above 100. My Holdover runs between 03 and 4 microseconds. John? WA4WDL -------------------------------------------------- From: "Doug Parker" <doug.parker@btinternet.com> Sent: Sunday, November 11, 2012 1:36 PM To: <time-nuts@febo.com> Subject: Re: [time-nuts] Z3805 hold-Over > > > > Hi, > > I've got a Z3805 from one of the Chineese sources and had problems with the HP 11801 oscillator which came with it. Even after a couple of weeks operartion it was moving vast EFC voltages with the 'Holdover Uncertainty Predict' reaching a lowest of 19uS. > > So I tried the HP oscillator from my Z3801 in the Z3805 and the daily EFC change is back to a resonable level, but after 5 days of settling down, the 'Holdeover Uncertainy Predict' has only got down to 10uS.and is holding about that value. > > Could some one please advise what figures they are getting. As there's something sticking in my mind that the whole system should be lower than 6.3uS after 3 days of locked operation. Or have I been dreaming..... > > I have attached a JPG of my GPSCon graph, hope it helps > > thanks & 73s > Doug > G4DZU > http://www.g4dzu.com/ > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. ------------------------------ Message: 3 Date: Sun, 11 Nov 2012 20:29:11 +0100 From: Volker Esper <ailer2@t-online.de> To: Discussion of precise time and frequency measurement     <time-nuts@febo.com> Subject: Re: [time-nuts] Z3805 hold-Over Message-ID: <509FFC87.3090609@t-online.de> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Yes, I guess, signal strength is essential. My holdover uncertainty is (after 1 weeks) about 1 to 2us. Volker DF9PL Am 11.11.2012 20:04, schrieb jmfranke: > Your 21 ns for 1PPS and T1 does not look too bad, but the satellite > received signal strengths are too low. You should have at least four or > five SS values above 60-80. I always have at least three SS readings > above 100. My Holdover runs between 03 and 4 microseconds. > > John WA4WDL > > -------------------------------------------------- > From: "Doug Parker" <doug.parker@btinternet.com> > Sent: Sunday, November 11, 2012 1:36 PM > To: <time-nuts@febo.com> > Subject: Re: [time-nuts] Z3805 hold-Over > >> >> >> >> Hi, >> >> I've got a Z3805 from one of the Chineese sources and had problems >> with the HP 11801 oscillator which came with it. Even after a couple >> of weeks operartion it was moving vast EFC voltages with the 'Holdover >> Uncertainty Predict' reaching a lowest of 19uS. >> >> So I tried the HP oscillator from my Z3801 in the Z3805 and the daily >> EFC change is back to a resonable level, but after 5 days of settling >> down, the 'Holdeover Uncertainy Predict' has only got down to 10uS.and >> is holding about that value. >> >> Could some one please advise what figures they are getting. As there's >> something sticking in my mind that the whole system should be lower >> than 6.3uS after 3 days of locked operation. Or have I been dreaming..... >> >> I have attached a JPG of my GPSCon graph, hope it helps >> >> thanks & 73s >> Doug >> G4DZU >> http://www.g4dzu.com/ > > > >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. > > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > ------------------------------ Message: 4 Date: Sun, 11 Nov 2012 20:33:56 +0100 From: Volker Esper <ailer2@t-online.de> To: Doug Parker <doug.parker@btinternet.com>,     Discussion of precise     time and frequency measurement <time-nuts@febo.com> Subject: Re: [time-nuts] Z3805 hold-Over Message-ID: <509FFDA4.9050902@t-online.de> Content-Type: text/plain; charset=ISO-8859-1; format=flowed You can easily check the 5V by measuring at the open antenna plug. When plugging the antenna, total current consumption should increase by about 10mA or so. Am 11.11.2012 20:24, schrieb Doug Parker: > Hi John, > > Thanks for the observation, with the same antenna plugged into my Z3801, I get an SS of at least 90. > > I'll place a preamp in line to see if that increases the SS on the 3805 , maybe my problem is the GPS RX isn't well. Great point. > > Of course,  I'll watch out for the 5V power feed going up the coax for the preamp in the antenna. > > 73s > Doug > G4DZU > > > ________________________________ >   From: jmfranke<jmfranke@cox.net> > To: Doug Parker<doug.parker@btinternet.com>; time-nuts@febo.com > Sent: Sunday, 11 November 2012, 19:04 > Subject: Re: [time-nuts] Z3805 hold-Over > > Your 21 ns for 1PPS and T1 does not look too bad, but the satellite received signal strengths are too low. You should have at least four or five SS values above 60-80. I always have at least three SS readings above 100. My Holdover runs between 03 and 4 microseconds. > > John  WA4WDL > > -------------------------------------------------- > From: "Doug Parker"<doug.parker@btinternet.com> > Sent: Sunday, November 11, 2012 1:36 PM > To:<time-nuts@febo.com> > Subject: Re: [time-nuts] Z3805 hold-Over > >> >> >> >> Hi, >> >> I've got a Z3805 from one of the Chineese sources and had problems with the HP 11801 oscillator which came with it. Even after a couple of weeks operartion it was moving vast EFC voltages with the 'Holdover Uncertainty Predict' reaching a lowest of 19uS. >> >> So I tried the HP oscillator from my Z3801 in the Z3805 and the daily EFC change is back to a resonable level, but after 5 days of settling down, the 'Holdeover Uncertainy Predict' has only got down to 10uS.and is holding about that value. >> >> Could some one please advise what figures they are getting. As there's something sticking in my mind that the whole system should be lower than 6.3uS after 3 days of locked operation. Or have I been dreaming..... >> >> I have attached a JPG of my GPSCon graph, hope it helps >> >> thanks&  73s >> Doug >> G4DZU >> http://www.g4dzu.com/ > > > >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > ------------------------------ Message: 5 Date: Sun, 11 Nov 2012 15:46:27 -0500 From: Bob Camp <lists@rtty.us> To: Doug Parker <doug.parker@btinternet.com>,    Discussion of precise     time and frequency measurement <time-nuts@febo.com> Subject: Re: [time-nuts] Z3805 hold-Over Message-ID: <9EC6326B-C8DF-4ED3-A1D0-3CBF4E7D31D7@rtty.us> Content-Type: text/plain; charset=iso-8859-1 Hi Most of mine get down to ridiculously low numbers after a few weeks to a few months on. How long seems to depend on how many years the unit has been off power. Any estimate under 500 ns is questionable with that hardware. The firmware seems to be quite happy reporting numbers well below that. Bob On Nov 11, 2012, at 1:36 PM, Doug Parker <doug.parker@btinternet.com> wrote: > >  > > Hi, > > I've got a Z3805 from one of the Chineese sources and had problems with the HP 11801 oscillator which came with it. Even after a couple of weeks  operartion it was moving vast EFC voltages with  the 'Holdover Uncertainty Predict'  reaching a lowest of 19uS. > > So I tried the HP oscillator from my Z3801 in the Z3805 and the daily EFC change is back to a resonable level, but after 5 days of settling down, the 'Holdeover Uncertainy Predict' has only got down to 10uS.and is holding about that value. > > Could some one please advise what figures they are getting. As there's something sticking in my mind that the whole system should be lower than 6.3uS after 3 days of locked operation. Or have I been dreaming..... > > I have attached a JPG of my GPSCon graph, hope it helps > > thanks & 73s > Doug > G4DZU > http://www.g4dzu.com/<3801-5Days.jpg>_______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. ------------------------------ Message: 6 Date: Sun, 11 Nov 2012 15:52:44 -0500 From: Bob Camp <lists@rtty.us> To: Discussion of precise time and frequency measurement     <time-nuts@febo.com> Subject: Re: [time-nuts] Z3805 hold-Over Message-ID: <C9C84563-7B7B-4EEB-BE78-41098B17802C@rtty.us> Content-Type: text/plain; charset=iso-8859-1 Hi You may well over drive the GPS board if you put more amplification in the line. If the antenna and coax work ok with a 3801, they should be fine with a 3805. If you have a very high gain setup, it may be ok for the 3801 and be over driving the 3805 already. What kind of antenna and coax are you using? Bob On Nov 11, 2012, at 2:24 PM, Doug Parker <doug.parker@btinternet.com> wrote: > Hi John, >  > Thanks for the observation, with the same antenna plugged into my Z3801, I get an SS of at least 90. >  > I'll place a preamp in line to see if that increases the SS on the 3805 , maybe my problem is the GPS RX isn't well. Great point. >  > Of course,  I'll watch out for the 5V power feed going up the coax for the preamp in the antenna. >  > 73s > Doug > G4DZU > > > ________________________________ > From: jmfranke <jmfranke@cox.net> > To: Doug Parker <doug.parker@btinternet.com>; time-nuts@febo.com > Sent: Sunday, 11 November 2012, 19:04 > Subject: Re: [time-nuts] Z3805 hold-Over > > Your 21 ns for 1PPS and T1 does not look too bad, but the satellite received signal strengths are too low. You should have at least four or five SS values above 60-80. I always have at least three SS readings above 100. My Holdover runs between 03 and 4 microseconds. > > John  WA4WDL > > -------------------------------------------------- > From: "Doug Parker" <doug.parker@btinternet.com> > Sent: Sunday, November 11, 2012 1:36 PM > To: <time-nuts@febo.com> > Subject: Re: [time-nuts] Z3805 hold-Over > >> >> >> >> Hi, >> >> I've got a Z3805 from one of the Chineese sources and had problems with the HP 11801 oscillator which came with it. Even after a couple of weeks operartion it was moving vast EFC voltages with the 'Holdover Uncertainty Predict' reaching a lowest of 19uS. >> >> So I tried the HP oscillator from my Z3801 in the Z3805 and the daily EFC change is back to a resonable level, but after 5 days of settling down, the 'Holdeover Uncertainy Predict' has only got down to 10uS.and is holding about that value. >> >> Could some one please advise what figures they are getting. As there's something sticking in my mind that the whole system should be lower than 6.3uS after 3 days of locked operation. Or have I been dreaming..... >> >> I have attached a JPG of my GPSCon graph, hope it helps >> >> thanks & 73s >> Doug >> G4DZU >> http://www.g4dzu.com/ > > > >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. ------------------------------ _______________________________________________ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts End of time-nuts Digest, Vol 100, Issue 38 ****************************************** _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.