Early GPS receivers used a 10.23 MHz time base.
Probably related to 2^10-1.
Some GPS manufacturers approached HP about making
a 10811 on 10.23 MHz. There is a circuit modification
for 10.23 MHz and some crystals were made (I
have some somewhere). However, I don't believe
any 10.23 MHz 10811's
Hi Rick:
10.23 MHz shows up in the ICD-200 spec on how the GPS signal is generated.
I've got a GPS sig gen see:
http://www.prc68.com/I/5001A.html
http://www.prc68.com/I/5001Bot.html
and it has an HP 10.23 MHz oscillator.
Have Fun,
Brooke Clarke
http://www.prc68.com/P/Prod.html Products I make
At 08:33 AM 5/30/2008, you wrote:
Early GPS receivers used a 10.23 MHz time base.
Probably related to 2^10-1.
yep.. the chip rate for the C/A code is 1.023 Megachips/second, the P
code is 10.23 Megachips/second, and the L1 frequency (1575.42) is
exactly 154 times the 10.23 MHz, the L2 is 120
Brooke,
That would imply that this 10.23 MHz ocxo could be used in place of a GPS
receiver's
oscillator and some additional circuitry to form a LOOP. Then divide by 1023
for a
reference frequency to another loop with a sine-wave oscillator as the house
standard.
I have seen the above
Bill,
I have not seen 10.23MHz external freq input on commercial receivers.
But I have two ancient (ca 1991) Magnavox GPS Engines. (As seen on page
23 in pdf below.)
http://www.rms-ion.org/Presentations/Dual-Use%20GPS.pdf
These are running on 10.23MHz XOs. One (of too many) future projects
: Friday, May 30, 2008 12:47 PM
Subject: Re: [time-nuts] Piezo Little Wonder OCXO
At 08:33 AM 5/30/2008, you wrote:
Early GPS receivers used a 10.23 MHz time base.
Probably related to 2^10-1.
yep.. the chip rate for the C/A code is 1.023 Megachips/second, the P
code is 10.23 Megachips/second
in a scheme where instead
of I/Q they did offset IF sampling.
John WA4WDL
- Original Message -
From: Jim Lux [EMAIL PROTECTED]
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Friday, May 30, 2008 12:47 PM
Subject: Re: [time-nuts] Piezo Little Wonder OCXO
of precise time and frequency measurement
time-nuts@febo.com
Sent: Friday, May 30, 2008 12:47 PM
Subject: Re: [time-nuts] Piezo Little Wonder OCXO
At 08:33 AM 5/30/2008, you wrote:
Early GPS receivers used a 10.23 MHz time base.
Probably related to 2^10-1.
yep.. the chip rate for the C
to,
[EMAIL PROTECTED]
- Original Message -
From: Randy Leifer [EMAIL PROTECTED]
To: time-nuts@febo.com
Sent: Thursday, May 29, 2008 10:26 PM
Subject: [time-nuts] Piezo Little Wonder OCXO
This is surplus item I found.
Piezo Crystal Company
Piezo Little Wonder
model # 2910007-27
Does
This is surplus item I found.
Piezo Crystal Company
Piezo Little Wonder
model # 2910007-27
Does anyone know the pin-outs (see photo/link)?
What is a the freq 10.238 MHz used for ?
There is a trim pot, but I doubt it will trim away
238k to get to 10MHz.
Leifer
Sent: Thursday, May 29, 2008 10:26 PM
To: time-nuts@febo.com
Subject: [time-nuts] Piezo Little Wonder OCXO
This is surplus item I found.
Piezo Crystal Company
Piezo Little Wonder
model # 2910007-27
Does anyone know the pin-outs (see photo/link)?
What is a the freq 10.238 MHz used
To: time-nuts@febo.com
Subject: [time-nuts] Piezo Little Wonder OCXO
This is surplus item I found.
Piezo Crystal Company
Piezo Little Wonder
model # 2910007-27
Does anyone know the pin-outs (see photo/link)?
What is a the freq 10.238 MHz used for ?
There is a trim pot, but I doubt
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