[Drake] TR-4 troubleshooting

[Richard Peterson]

Any good TR-4 troubleshooters on line? My good old TR-4 has gotten "testy" again, this time it works on some modes and not others. For example, on 80 meters, it works fine on USB with good output, but has no output on lower sideband. On 40 meters, both modes are dead: It will receive, but calibration is way off. On 20 meters, USB is good and LSB has no output; on 15 meters, USB is dead and LSB is OK. You get the picture.

There is no "mixing" with the xtal oscillator in this design on both 80 and 20. Therefore, 9 MHZ IF plus 5 MHX PTO gives you 14 MHZ, and on 80, it uses the 9MHZ IF minus the 5 MHZ PTO to five you 4 MHZ. Too, the sideband filters get switched back and forth, I believe.
 
Regardless, this is very screwy. As I said, any good 'shooters out there?

Richard
WB5NEN

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