I recently had a most significant digit error on my TR7. What was happening was that the readout showed 4053, when the actual frequncy should have been 14053, for example, when the bandswitch was set to 20 mtrs. Likewise it showed 11053 when it should have been 21053 on 15 mtrs.
The synthesizer was off - it wasn't a readout error. The problem was in the digital control pcb. I had a spare and installing the spare solved the problem. However, I note that there are two versions of the digital control PCB. My original one has a PROM plus a digital divider circuit. The replacement one (older version?) has no PROM but does everything with counter/divider chips. From a quick logic probe check I suspect that the PROM is bad in the original PCB. The technical manual shows both versions. Anyone know of a source of these PROMS for one of these digital control PCBs?? Does the firmware exist? It programs each Amateur Band. Anyone know why the two versions exist? Are there more problems with one? tnx es 73, Doug/WA1TUT _______________________________________________ Drakelist mailing list [email protected] http://mailman.zerobeat.net/mailman/listinfo/drakelist
