Thanks Arv. I only have an old oscilloscope and I use an Arduino/AD9850 combination (which will become my VFO later) as a signal generator. That' s how I tried to determine how the BPF was doing. I guess you are right, adding one or two turns might be best. But I did not take input or output impedance in accounts so that could affect the properties of the filter as well.
I kept my BFO at 3 kHz *below* the IF frequency but by using a VFO of 17 MHz the mixer should convert the LSB signals into USB and vise versa on TX. So my main concern is the CB 27 MHz band.
If you know of a simpler (wider) BPF for 40 meters, please let me know. I will experiment with LTspice, have not used it before. Appreciate your response...
Fokko PH0KKO
