Ken --
You don't really need to set up a DDS BFO. The on-board BFO oscillator is strong and stable. What you probably should do is adjust the BFO frequency directly to suit your ears. (See message #19317; that is what I did with my unit). You can setup a DDS BFO as well, of course; I know you now know how to do that. --? If using a DDS, remember to disable the on-board oscillator; probably removing the BFO crystal is the simplest solution. In fact, injecting the DDS signal into where the crystal was is probably the best all-around solution as to where to do it. Mind the signal level and the frequency. Experiment for the best sound.
You probably SHOULD use a DDS for the VFO. Remember to disable the on-board VFO oscillator by removing L4.
john
AD5YE
---In BITX20@..., <chase8043@...> wrote :
I got it. I kept thinking the IF(12 MHZ) was the BFO. So it turns out my BFO is also 11.9986 MHZ.
So if I have mine start at say 7.164 MHZ, it's o/p is 11.9986 - 7.164 = 4.8346 MHZ
OK back to the DDS LPF and 20M BPF.
73 Ken
