As for SPAN control, Kelivin-Varley Voltage Divider was found to be worked well. I was checked the frequency range of all 60-bands with this voltage divider. The schematic is attached (sorry in Japanese).
Teruo Katoh
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On 2024/01/12 6:39, Larry Lovell wrote:
Any suggestions on how to make the BFO?
I am experimenting with two different ideas for the SPAN control.? One is a 10 turn 10 K resistor with dial.? The other is a 10 position rotary switch with selected resistors.
As always, I am open for suggestions.
