Found this on zerobeat under Drake Mods by VE3EFJ:
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- 8.05 MHz Osc Won't Net
This oscillator is varicap controlled and is used in conjunction with the 13.995 fixed oscillator to develop the BFO. In doing it this way, there is little chance that there will be BFO leakage, or what leakage there is, can be controlled.
There is a trimmer adjustment to net the 8.05 MHz crystal, but what the manual fails to tell you is that this adjustment is also affected by the trim pots for the injection frequencies for the BFO.
If you try to set this trimmer up and it just won't trim, try an arbitrary setting of the trimmer screw and see if, say, on LSB you can get it to the proper frequency with the trim pot for that mode.
Would this actually work?? If the best one can net the crystal is say around 5.646 instead of 5.645 will the rig work correctly? if the trim pots on the power supply board for USB, LSB, CW, RTTY and AM will all adjust to the proper frequencies?? Seems a lot easier than trial and error padding of C1029.
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73, Bill NZ0T
