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562pbtadj [2007/04/09 18:57] n5na created |
562pbtadj [2007/05/21 00:43] n5na |
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| Since I've not seen this explained elsewhere, here's what I did to adjust the Passband tuning control: | Since I've not seen this explained elsewhere, here's what I did to adjust the Passband tuning control: | ||
| - | -Find a good spot to connect the freq counter! The manual doesn't say, so I tried several places. First place I tried was the emitter of Q4. Bad spot! The counter displayed the freq, and I readjusted everything. After I disconnected the counter and | + | -Find a good spot to connect the freq counter! The manual doesn't say, so I tried several places. First place I tried was the emitter of Q4. Bad spot! The counter displayed the freq, and I readjusted everything. After I disconnected the counter and checked it on the air, it was off considerably. Basically the counter/cable was pulling the oscillator. The best place I found was the emitter of Q7 (easiest place to make a connection is where R44 connects to the emitter of Q7). |
| - | checked it on the air, it was off considerably. Basically the counter/cable was pulling the oscillator. The best place I found was the emitter of Q7 (easiest place to make a connection is where R44 connects to the emitter of Q7). | + | |
| -Turn the Passband control to the extreme that places the lowest voltage on the varactor. I have to admit I can't remember which direction this is! Basically turn it to whichever extreme show's the highest freq on the counter. | -Turn the Passband control to the extreme that places the lowest voltage on the varactor. I have to admit I can't remember which direction this is! Basically turn it to whichever extreme show's the highest freq on the counter. | ||
| -Adjust C22 (small trimmer cap) for a frequency of 15.3023 MHz | -Adjust C22 (small trimmer cap) for a frequency of 15.3023 MHz | ||
