[time-nuts] time-nuts Digest, Vol 118, Issue 35 Message: 3
Walter Hofstädtler
walter at hofstaedtler.com
Sat May 17 16:53:21 UTC 2014
Hi,
> Traced the problem of my FTS 1200 to the first BC109 Transistor on the
> A2/A3 AGS/Amplifier board. Since it is right after the Oscillator transistor low noise is critical. This unit is at least 30 years old and my question is, what transistor will have
> even lower noise than the than low noise BC 109.
> Voltage is 6.43 V.
A BC 549 is a replacement
Walter
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Gesendet: Samstag, 17. Mai 2014 18:00
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Betreff: time-nuts Digest, Vol 118, Issue 35
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Today's Topics:
1. Re: Fwd: CGSIC: Known Problem With Certain GPS Devices
(Magnus Danielson)
2. Re: Fwd: CGSIC: Known Problem With Certain GPS Devices
(Brooke Clarke)
3. FTS 1200 transistor replacement (EWKehren at aol.com)
----------------------------------------------------------------------
Message: 1
Date: Sat, 17 May 2014 01:01:50 +0200
From: Magnus Danielson <magnus at rubidium.dyndns.org>
To: time-nuts at febo.com
Subject: Re: [time-nuts] Fwd: CGSIC: Known Problem With Certain GPS
Devices
Message-ID: <537698DE.2050707 at rubidium.dyndns.org>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
They can't point official fingers. That's why.
Ask you vendor if they need firmware upgrades to comply in this aspect.
Cheers,
Magnus
On 05/16/2014 12:39 AM, SAIDJACK at aol.com wrote:
> It would be good to understand which receivers are adversely affected
> by this.. the USCG did not list affected vendors/devices..
>
>
> In a message dated 5/15/2014 15:19:51 Pacific Daylight Time,
> magnus at rubidium.dyndns.org writes:
>
> Hi fellow time-nuts,
>
> I think this message is interesting. It shows that some receiver
> vendors have been cheating on an important detail, ignoring the
> health status and being confused as a result.
>
> Cheers,
> Magnus
>
>
> -------- Original Message --------
> Subject: CGSIC: Known Problem With Certain GPS Devices
> Date: Thu, 15 May 2014 21:20:23 +0000
> From: Civil Global Positioning System Service Interface Committee
> (CGSIC) <cgsic at cgls.uscg.mil>
> Reply-To: cgsic at cgls.uscg.mil
> To: cgsic at cgls.uscg.mil <cgsic at cgls.uscg.mil>
>
> All CGSIC:
>
> May 15, 2014
>
> Recently, many GPS users have reported intermittent GPS outages in
> their devices. After investigating, the U.S. government has linked
> the problem to flawed processing of GPS satellite data within certain
> GPS receiver chipsets. The GPS satellite service continues to
> function as designed and is fully operational and available worldwide.
>
> The problem affects only user equipment that erroneously ignores the
> satellite health status information broadcast from every GPS satellite.
> The problem is not related to the April 28, 2014, activation of civil
> navigation messages on the GPS L2C and L5 signals.
>
> Since March 15, 2014, the Air Force has been conducting functional
> checkout on a GPS satellite, designated Space Vehicle Number (SVN) 64.
> SVN 64 broadcasts a data message that clearly indicates SVN 64 is
> unusable for navigation. Nevertheless, the U.S. government has
> confirmed that certain GPS receivers are using data from SVN 64, in
> violation of GPS interface specifications, resulting in outages or
> corrupted, inaccurate position calculations.
>
> The Air Force testing is scheduled to end in mid-May 2014 at which
> time SVN 64 will begin normal operation. At that point, these problems may
> stop occurring. Meanwhile, the U.S. government urges all GPS device
> makers to review their products for compliance with the GPS interface
> specifications, and if necessary, to issue software/firmware updates
> to users as soon as possible. View specifications
> http://www.gps.gov/technical/icwg/
>
> Users experiencing GPS outages should check with their device
> manufacturers for available software/firmware updates. In addition,
> any civil user seeing unusual behavior in GPS user equipment should
> report it to the U.S. Coast Guard Navigation Center (NAVCEN).
> Aviation users should file reports consistent with FAA-approved
> procedures. Military users seeing unusual behavior should report it
> the GPS Operations Center (GPSOC).
>
> Please direct any civil user questions to NAVCEN at (703) 313-5900,
> http://www.navcen.uscg.gov Please direct any military user questions
> to the GPSOC at (719) 567-2541, DSN: 560-2541,
> gpsoperationscenter at us.af.mil https://gps.afspc.af.mil Military
> alternate: Joint Space Operations Center, (805) 606-3514, DSN:
> 276-3514, jspoccombatops at vandenberg.af.mil
> ----
> See also:
> Technical explanation for device makers (PDF)
> http://www.navcen.uscg.gov/pdf/gps/GPSOC_PRN 30_Notice.pdf
>
> V/R
> Rick Hamilton
> CGSIC Executive Secretariat
> GPS Information Analysis Team Lead
> USCG Navigation Center
> 703-313-5930
>
>
> _______________________________________________
> CGSIC one-way mailing list
> Unsubscribe: http://cgls.uscg.mil/mailman/listinfo/cgsic
>
> If you would like to report abuse of the CGLS listserv please send an
> email to: CGLSAdmin at uscg.mil
>
>
> _______________________________________________
> time-nuts mailing list -- time-nuts at 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 at febo.com To unsubscribe, go to
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>
------------------------------
Message: 2
Date: Fri, 16 May 2014 17:23:19 -0700
From: Brooke Clarke <brooke at pacific.net>
To: Discussion of precise time and frequency measurement
<time-nuts at febo.com>
Subject: Re: [time-nuts] Fwd: CGSIC: Known Problem With Certain GPS
Devices
Message-ID: <5376ABF7.50601 at pacific.net>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Hi:
I recently got a CSI LGBX Pro DGPS Receiver and it used to display a list of the satellites it was tracking, but not that function is no longer working.
But all the other functions seem to work. CSI made their own LF beacon receivers but in this model they use an Ashtech G-12L for GPS and a Fugro 3000 Receiver for the OmniSTAR correction subscription service which costs $800/year. I've asked Trimble (who are doing the tech support for Ashtech) if there's a firmware upgrade.
http://www.prc68.com/I/LGBXcsiDGPS.html
Have Fun,
Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html
Magnus Danielson wrote:
> They can't point official fingers. That's why.
>
> Ask you vendor if they need firmware upgrades to comply in this aspect.
>
> Cheers,
> Magnus
>
> On 05/16/2014 12:39 AM, SAIDJACK at aol.com wrote:
>> It would be good to understand which receivers are adversely
>> affected by this.. the USCG did not list affected vendors/devices..
>>
>>
>> In a message dated 5/15/2014 15:19:51 Pacific Daylight Time,
>> magnus at rubidium.dyndns.org writes:
>>
>> Hi fellow time-nuts,
>>
>> I think this message is interesting. It shows that some receiver
>> vendors have been cheating on an important detail, ignoring the
>> health status and being confused as a result.
>>
>> Cheers,
>> Magnus
>>
>>
>> -------- Original Message --------
>> Subject: CGSIC: Known Problem With Certain GPS Devices
>> Date: Thu, 15 May 2014 21:20:23 +0000
>> From: Civil Global Positioning System Service Interface Committee
>> (CGSIC) <cgsic at cgls.uscg.mil>
>> Reply-To: cgsic at cgls.uscg.mil
>> To: cgsic at cgls.uscg.mil <cgsic at cgls.uscg.mil>
>>
>> All CGSIC:
>>
>> May 15, 2014
>>
>> Recently, many GPS users have reported intermittent GPS outages in
>> their devices. After investigating, the U.S. government has linked
>> the problem to flawed processing of GPS satellite data within certain
>> GPS receiver chipsets. The GPS satellite service continues to
>> function as designed and is fully operational and available worldwide.
>>
>> The problem affects only user equipment that erroneously ignores the
>> satellite health status information broadcast from every GPS satellite.
>> The problem is not related to the April 28, 2014, activation of
>> civil navigation messages on the GPS L2C and L5 signals.
>>
>> Since March 15, 2014, the Air Force has been conducting functional
>> checkout on a GPS satellite, designated Space Vehicle Number (SVN) 64.
>> SVN 64 broadcasts a data message that clearly indicates SVN 64 is
>> unusable for navigation. Nevertheless, the U.S. government has
>> confirmed that certain GPS receivers are using data from SVN 64, in
>> violation of GPS interface specifications, resulting in outages or
>> corrupted, inaccurate position calculations.
>>
>> The Air Force testing is scheduled to end in mid-May 2014 at which
>> time SVN 64 will begin normal operation. At that point, these problems may
>> stop occurring. Meanwhile, the U.S. government urges all GPS device
>> makers to review their products for compliance with the GPS interface
>> specifications, and if necessary, to issue software/firmware updates
>> to users as soon as possible. View specifications
>> http://www.gps.gov/technical/icwg/
>>
>> Users experiencing GPS outages should check with their device
>> manufacturers for available software/firmware updates. In addition,
>> any civil user seeing unusual behavior in GPS user equipment should
>> report it to the U.S. Coast Guard Navigation Center (NAVCEN).
>> Aviation users should file reports consistent with FAA-approved
>> procedures. Military users seeing unusual behavior should report it
>> the GPS Operations Center (GPSOC).
>>
>> Please direct any civil user questions to NAVCEN at (703) 313-5900,
>> http://www.navcen.uscg.gov Please direct any military user questions
>> to the GPSOC at (719) 567-2541, DSN: 560-2541,
>> gpsoperationscenter at us.af.mil https://gps.afspc.af.mil Military
>> alternate: Joint Space Operations Center, (805) 606-3514, DSN:
>> 276-3514, jspoccombatops at vandenberg.af.mil
>> ----
>> See also:
>> Technical explanation for device makers (PDF)
>> http://www.navcen.uscg.gov/pdf/gps/GPSOC_PRN 30_Notice.pdf
>>
>> V/R
>> Rick Hamilton
>> CGSIC Executive Secretariat
>> GPS Information Analysis Team Lead
>> USCG Navigation Center
>> 703-313-5930
>>
>>
>> _______________________________________________
>> CGSIC one-way mailing list
>> Unsubscribe: http://cgls.uscg.mil/mailman/listinfo/cgsic
>>
>> If you would like to report abuse of the CGLS listserv please send
>> an email to: CGLSAdmin at uscg.mil
>>
>>
>> _______________________________________________
>> time-nuts mailing list -- time-nuts at 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 at 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 at febo.com To unsubscribe, go to
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
>
------------------------------
Message: 3
Date: Sat, 17 May 2014 11:37:42 -0400 (EDT)
From: EWKehren at aol.com
To: time-nuts at febo.com
Subject: [time-nuts] FTS 1200 transistor replacement
Message-ID: <62f98.1c47159b.40a8dc4d at aol.com>
Content-Type: text/plain; charset="US-ASCII"
Traced the problem of my FTS 1200 to the first BC109 Transistor on the
A2/A3 AGS/Amplifier board. Since it is right after the Oscillator transistor low noise is critical. This unit is at least 30 years old and my question is, what transistor will have even lower noise than the than low noise BC 109.
Voltage is 6.43 V.
Thanks Bert Kehren
------------------------------
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