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No BFO Adjustment


jerryk5lru
 

This is a Bitx20 Version 3. I'm almost done with it. The receiver receives good, the VFO bandwidth is between 14,000. and 14,450. The exciter produces a signal of 500mv and the PA kicks that up to around 4 volts. When trying to tune the BFO and the carrier balance is where I have the problem. My frequency is 9995.31 mhz at the emitter of Q9. Here is where the problem starts. Leonards instructions say I should have 15kc adjustment. But all I have is about 3 hertz, not kilohertz with the 22pf trimmer. So when I try to adjust the carrier balance, in transmit, 7 db down the filter skirt, I have no adjustment. The carrier balance is .321mv on the low side and .634mv on the high side. It nulls out in the middle of the pot. This is why I think I'm not getting enough drive. Any thoughts? Thanks, Jerry K5LRU

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