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 -----Ursprüngliche Nachricht----- Von: [email protected] [mailto:[email protected]] Im Auftrag von [email protected] Gesendet: Samstag, 17. Mai 2014 18:00 An: [email protected] Betreff: time-nuts Digest, Vol 118, Issue 35 Send time-nuts mailing list submissions to [email protected] 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 [email protected] You can reach the person managing the list at [email protected] When replying, please edit your Subject line so it is more specific than "Re: Contents of time-nuts digest..." 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 ([email protected]) ---------------------------------------------------------------------- Message: 1 Date: Sat, 17 May 2014 01:01:50 +0200 From: Magnus Danielson <[email protected]> To: [email protected] Subject: Re: [time-nuts] Fwd: CGSIC: Known Problem With Certain GPS Devices Message-ID: <[email protected]> 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, [email protected] 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, > [email protected] 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) <[email protected]> > Reply-To: [email protected] > To: [email protected] <[email protected]> > > 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, > [email protected] https://gps.afspc.af.mil Military > alternate: Joint Space Operations Center, (805) 606-3514, DSN: > 276-3514, [email protected] > ---- > 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: [email protected] > > > _______________________________________________ > time-nuts mailing list -- [email protected] To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- [email protected] To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > ------------------------------ Message: 2 Date: Fri, 16 May 2014 17:23:19 -0700 From: Brooke Clarke <[email protected]> To: Discussion of precise time and frequency measurement <[email protected]> Subject: Re: [time-nuts] Fwd: CGSIC: Known Problem With Certain GPS Devices Message-ID: <[email protected]> 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, [email protected] 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, >> [email protected] 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) <[email protected]> >> Reply-To: [email protected] >> To: [email protected] <[email protected]> >> >> 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, >> [email protected] https://gps.afspc.af.mil Military >> alternate: Joint Space Operations Center, (805) 606-3514, DSN: >> 276-3514, [email protected] >> ---- >> 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: [email protected] >> >> >> _______________________________________________ >> time-nuts mailing list -- [email protected] To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> >> _______________________________________________ >> time-nuts mailing list -- [email protected] To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> > _______________________________________________ > time-nuts mailing list -- [email protected] 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: [email protected] To: [email protected] Subject: [time-nuts] FTS 1200 transistor replacement Message-ID: <[email protected]> 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 ------------------------------ _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts End of time-nuts Digest, Vol 118, Issue 35 ****************************************** _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
