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Discussion of precise time and frequency measurement

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LORAN C receiver

GL
Glenn Little WB4UIV
Mon, May 30, 2022 1:21 AM

I have a Si-Tex KODEN 797 receiver.
I this usable with eLORAN and can I get useful timing data from the data
out BNC connector?

Can this be used for anything other than parts?

Thanks
73
Glenn
WB4UIV

--

Glenn Little                ARRL Technical Specialist  QCWA  LM 28417
Amateur Callsign:  WB4UIV            wb4uiv@arrl.net    AMSAT LM 2178
QTH:  Goose Creek, SC USA (EM92xx)  USSVI, FRA, NRA-LM    ARRL TAPR
"It is not the class of license that the Amateur holds but the class
of the Amateur that holds the license"

I have a Si-Tex KODEN 797 receiver. I this usable with eLORAN and can I get useful timing data from the data out BNC connector? Can this be used for anything other than parts? Thanks 73 Glenn WB4UIV -- ----------------------------------------------------------------------- Glenn Little ARRL Technical Specialist QCWA LM 28417 Amateur Callsign: WB4UIV wb4uiv@arrl.net AMSAT LM 2178 QTH: Goose Creek, SC USA (EM92xx) USSVI, FRA, NRA-LM ARRL TAPR "It is not the class of license that the Amateur holds but the class of the Amateur that holds the license"
PS
paul swed
Mon, May 30, 2022 5:10 PM

Glenn good afternoon.
Unfamiliar with that receiver. If its a location receiver for a plane or
boat then it has no value as they depended on 3 sites to generate a
location. Today the eLORAN tests have been pretty much single site that
fakes a secondary transmitter.
Things like Austrons and SRS can leverage the single site for very accurate
frequency.
But those receivers were intended for frequency or timing.
I am staying clear of the timing aspect because I am honestly not sure
the old method is actually being transmitted.

Eloran provides an additional bit in the pulses that actually does contain
timing and correction information. Though all of the existing receivers to
my knowledge do not produce this data as an output.

If the US were to invest in eLORAN then I honestly believe the 9th bit
could be recovered from the SRS and Austrons. Decoded and used for time and
propagation corrections. I have seen the actual eLORAN receivers and they
seem to be SDR like.
But nothing a cheap time-nut could get your hands on.
Regards
Paul
WB8TSL

On Mon, May 30, 2022 at 10:57 AM Glenn Little WB4UIV via time-nuts <
time-nuts@lists.febo.com> wrote:

I have a Si-Tex KODEN 797 receiver.
I this usable with eLORAN and can I get useful timing data from the data
out BNC connector?

Can this be used for anything other than parts?

Thanks
73
Glenn
WB4UIV

--

Glenn Little                ARRL Technical Specialist  QCWA  LM 28417
Amateur Callsign:  WB4UIV            wb4uiv@arrl.net    AMSAT LM 2178
QTH:  Goose Creek, SC USA (EM92xx)  USSVI, FRA, NRA-LM    ARRL TAPR
"It is not the class of license that the Amateur holds but the class
of the Amateur that holds the license"


time-nuts mailing list -- time-nuts@lists.febo.com
To unsubscribe send an email to time-nuts-leave@lists.febo.com

Glenn good afternoon. Unfamiliar with that receiver. If its a location receiver for a plane or boat then it has no value as they depended on 3 sites to generate a location. Today the eLORAN tests have been pretty much single site that fakes a secondary transmitter. Things like Austrons and SRS can leverage the single site for very accurate frequency. But those receivers were intended for frequency or timing. I am staying clear of the timing aspect because I am honestly not sure the old method is actually being transmitted. Eloran provides an additional bit in the pulses that actually does contain timing and correction information. Though all of the existing receivers to my knowledge do not produce this data as an output. If the US were to invest in eLORAN then I honestly believe the 9th bit could be recovered from the SRS and Austrons. Decoded and used for time and propagation corrections. I have seen the actual eLORAN receivers and they seem to be SDR like. But nothing a cheap time-nut could get your hands on. Regards Paul WB8TSL On Mon, May 30, 2022 at 10:57 AM Glenn Little WB4UIV via time-nuts < time-nuts@lists.febo.com> wrote: > I have a Si-Tex KODEN 797 receiver. > I this usable with eLORAN and can I get useful timing data from the data > out BNC connector? > > Can this be used for anything other than parts? > > > Thanks > 73 > Glenn > WB4UIV > > -- > ----------------------------------------------------------------------- > Glenn Little ARRL Technical Specialist QCWA LM 28417 > Amateur Callsign: WB4UIV wb4uiv@arrl.net AMSAT LM 2178 > QTH: Goose Creek, SC USA (EM92xx) USSVI, FRA, NRA-LM ARRL TAPR > "It is not the class of license that the Amateur holds but the class > of the Amateur that holds the license" > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe send an email to time-nuts-leave@lists.febo.com >
GL
Glenn Little WB4UIV
Tue, May 31, 2022 10:08 PM

Thanks, it will be used for parts.
I is a boat navigation receiver that used a 20 MHz TCXO.

I was an Electronics tech on submarines, specialty navigation subsystem.
Shortly before I retired, they upgraded the nav system to remove the
WPN-3 LORAN receiver and replaced it with a BRN-5 LORAN sensor.
With this we only required two station to get a fix.
While inport we tracked LORAN C and determined a drift rate for our
cesium standards.
With the known drift rate of the LORAN station standard and our known
drift rate, we tracked "phase shift" LORAN.
Easier to remain locked to a net with only two stations required an
master no longer required.

73
Glenn
WB4UIV

On 5/30/2022 1:10 PM, paul swed via time-nuts wrote:

Glenn good afternoon.
Unfamiliar with that receiver. If its a location receiver for a plane or
boat then it has no value as they depended on 3 sites to generate a
location. Today the eLORAN tests have been pretty much single site that
fakes a secondary transmitter.
Things like Austrons and SRS can leverage the single site for very accurate
frequency.
But those receivers were intended for frequency or timing.
I am staying clear of the timing aspect because I am honestly not sure
the old method is actually being transmitted.

Eloran provides an additional bit in the pulses that actually does contain
timing and correction information. Though all of the existing receivers to
my knowledge do not produce this data as an output.

If the US were to invest in eLORAN then I honestly believe the 9th bit
could be recovered from the SRS and Austrons. Decoded and used for time and
propagation corrections. I have seen the actual eLORAN receivers and they
seem to be SDR like.
But nothing a cheap time-nut could get your hands on.
Regards
Paul
WB8TSL

On Mon, May 30, 2022 at 10:57 AM Glenn Little WB4UIV via time-nuts <
time-nuts@lists.febo.com> wrote:

I have a Si-Tex KODEN 797 receiver.
I this usable with eLORAN and can I get useful timing data from the data
out BNC connector?

Can this be used for anything other than parts?

Thanks
73
Glenn
WB4UIV

--

Glenn Little                ARRL Technical Specialist  QCWA  LM 28417
Amateur Callsign:  WB4UIV            wb4uiv@arrl.net    AMSAT LM 2178
QTH:  Goose Creek, SC USA (EM92xx)  USSVI, FRA, NRA-LM    ARRL TAPR
"It is not the class of license that the Amateur holds but the class
of the Amateur that holds the license"


time-nuts mailing list -- time-nuts@lists.febo.com
To unsubscribe send an email to time-nuts-leave@lists.febo.com


time-nuts mailing list -- time-nuts@lists.febo.com
To unsubscribe send an email to time-nuts-leave@lists.febo.com

--

Glenn Little                ARRL Technical Specialist  QCWA  LM 28417
Amateur Callsign:  WB4UIV            wb4uiv@arrl.net    AMSAT LM 2178
QTH:  Goose Creek, SC USA (EM92xx)  USSVI, FRA, NRA-LM    ARRL TAPR
"It is not the class of license that the Amateur holds but the class
of the Amateur that holds the license"

Thanks, it will be used for parts. I is a boat navigation receiver that used a 20 MHz TCXO. I was an Electronics tech on submarines, specialty navigation subsystem. Shortly before I retired, they upgraded the nav system to remove the WPN-3 LORAN receiver and replaced it with a BRN-5 LORAN sensor. With this we only required two station to get a fix. While inport we tracked LORAN C and determined a drift rate for our cesium standards. With the known drift rate of the LORAN station standard and our known drift rate, we tracked "phase shift" LORAN. Easier to remain locked to a net with only two stations required an master no longer required. 73 Glenn WB4UIV On 5/30/2022 1:10 PM, paul swed via time-nuts wrote: > Glenn good afternoon. > Unfamiliar with that receiver. If its a location receiver for a plane or > boat then it has no value as they depended on 3 sites to generate a > location. Today the eLORAN tests have been pretty much single site that > fakes a secondary transmitter. > Things like Austrons and SRS can leverage the single site for very accurate > frequency. > But those receivers were intended for frequency or timing. > I am staying clear of the timing aspect because I am honestly not sure > the old method is actually being transmitted. > > Eloran provides an additional bit in the pulses that actually does contain > timing and correction information. Though all of the existing receivers to > my knowledge do not produce this data as an output. > > If the US were to invest in eLORAN then I honestly believe the 9th bit > could be recovered from the SRS and Austrons. Decoded and used for time and > propagation corrections. I have seen the actual eLORAN receivers and they > seem to be SDR like. > But nothing a cheap time-nut could get your hands on. > Regards > Paul > WB8TSL > > On Mon, May 30, 2022 at 10:57 AM Glenn Little WB4UIV via time-nuts < > time-nuts@lists.febo.com> wrote: > >> I have a Si-Tex KODEN 797 receiver. >> I this usable with eLORAN and can I get useful timing data from the data >> out BNC connector? >> >> Can this be used for anything other than parts? >> >> >> Thanks >> 73 >> Glenn >> WB4UIV >> >> -- >> ----------------------------------------------------------------------- >> Glenn Little ARRL Technical Specialist QCWA LM 28417 >> Amateur Callsign: WB4UIV wb4uiv@arrl.net AMSAT LM 2178 >> QTH: Goose Creek, SC USA (EM92xx) USSVI, FRA, NRA-LM ARRL TAPR >> "It is not the class of license that the Amateur holds but the class >> of the Amateur that holds the license" >> _______________________________________________ >> time-nuts mailing list -- time-nuts@lists.febo.com >> To unsubscribe send an email to time-nuts-leave@lists.febo.com >> > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe send an email to time-nuts-leave@lists.febo.com -- ----------------------------------------------------------------------- Glenn Little ARRL Technical Specialist QCWA LM 28417 Amateur Callsign: WB4UIV wb4uiv@arrl.net AMSAT LM 2178 QTH: Goose Creek, SC USA (EM92xx) USSVI, FRA, NRA-LM ARRL TAPR "It is not the class of license that the Amateur holds but the class of the Amateur that holds the license"