Hi The first thing to check is the soldering job on the DB-9 connector. Second thing to check is the RS-232 level translator IC. (RS-232 in should create TTL etc)
Bob On May 8, 2012, at 5:52 PM, [email protected] wrote: > Hi group! > > Just got a few Thunderbolts. It is a few PN 39448-61 and one PN 38223-61. > Date codes from 9932 to 0025. This is the "normal" version with a 24VDC > power board and Tbolt board integrated in a small AL box with red > markings. One of the receivers is having a problem. Measuring from the > outside there is: > > 1) Takes the same amount of power as the working units.(to the > resolution measured) > 2) Has 10MHz output. > 3) Has 4.9VDC on antenna center pin. > 4) -8.9VDC stable on rs232 Tx pin (pin2 in DB9) > 5) 10MHz is 0.7Hz off after many power on hours with known good antenna > 6) TP9 & TP10 (close to the GPS board power connector) has 4.9VDC > 7) Tboltmon will not talk to the board. > 8) There is no serial output at all from the Tbolt. > > Differences compared to a good Tbolt > > 1) Tboltmon will ofcause communicate. > 2) After locking 10MHz will be very close to nominal > 3) TP9 and TP10 shows a square wave (ca 7V pp, 9.795625000kHz) > > I have looked at Tom's page at > > http://www.leapsecond.com/tbolt-faq.htm > > Brooke's at > > http://www.prc68.com/I/ThunderBolt.shtml#IC > > and John's at > > http://www.ke5fx.com/tbolt.htm > > Are there other good Thunderbolt sites? > > Has anyone done debugging of faulty Tbolts? Comments on what might be > wrong with my faulty unit? (I am not that experienced in hardware > debugging...) > > -- > > Björn > > > > > > > _______________________________________________ > 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.
