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
An: [email protected]
Betreff: time-nuts Digest, Vol 118, Issue 35
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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]
_______________________________________________
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------------------------------
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.
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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
------------------------------
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End of time-nuts Digest, Vol 118, Issue 35
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