After chatting with John Miles, and Paul (ziggy), I was reminded that TTL RS232 is not a good thing around a pedantic protocol analyzer.
4V signal swings would work with the analyzer's strict +/-3V thresholds, except for that wonderful excuse for a UART that Trimble used, putting a big glitch dead center in each sent bit position. The protocol analyzer saw that glitch drop below 3V, and just knew it was a start bit. And, that coupled with using 9600,8,N,1 instead of Trimble's favorite 9600,8,O,1 settings made for the interesting data smearing I was seeing. Now, I am getting properly formed TSIP packets. Time to decode them and see what they mean. More later, -Chuck Harris Chuck Harris wrote:
Hi gang! I am in the process of repairing a Ball/Efratom MFS209 GPSDO. The MGPS unit reports that I have an ADC fault, and a feed line fault. I have done some testing and can easily see that the feed line has the proper +5V on the unit's N connector, and that it can source the required 200ma, but with a known good antenna, the MGPS controller still reports the fault.
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