Measure the voltage at the center pin of your tuning pot to ground using a voltmeter. ?Does it smoothly vary between 0 and 5 volts as you turn the knob?
Odd that your rig powers up at 7.7mhz, but frequency going down in 100khz steps is what I would expect if the center pin of the pot was stuck at 0 volts.?
On Sun, Mar 26, 2017 at 11:35 am, Daniel Acevedo wrote:
As the title states, my tuning pot does not tune. When I power the BITX40, it starts off on a freq. of 7.700MHz and then decreases, by itself to 7.600, 7.500, 7.400 etc until it gets to about 6.900mhz. It then occassionaly fluctuates to 6.885mhz or something like that. Any ideas?
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