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562pbtadj [2007/04/09 18:57] n5na created |
562pbtadj [2007/06/10 17:48] (current) 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 | ||
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| Anthony, NT4X | Anthony, NT4X | ||
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| + | ---- | ||
| + | **Comments by email from I1OWT/5 - June 10, 2007** | ||
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| + | I had to adjust the PBT of Omni V transceiver and I could not adjust the PBT with the test point indicated by Anthony. | ||
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| + | The difference from the procedure described by Anthony, NT4X, is in the test point. It's possible that my frequency counter is not enough sensitive. | ||
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| + | This is the procedure I used to adjust the PBT freq: | ||
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| + | -Connect a frequency counter to L-3 on the PBT bd. | ||
| + | -Turn the PBT control full CW and adjust C-22 to 15.302.300 | ||
| + | -Turn PBT control to 12 o'clock position and adjust R-18 to read 15.300.000 | ||
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| + | 73 de I1OWT/5 | ||
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| + | pietro | ||
