Re: Redy for smoke test but Bitx 42


Dexter N Muir
 

Wrong, Curt.  Presence of that Tuning connector defines your board as BITX40 - and yes, Shep, that extra 3-pin connector on board was for the potentiometer to control the voltage of a varicap diode in the early analog oscillator. If you have the Raduino, that is redundant: the Raduino replaces that oscillator. The inductor for that oscillator was a toroid: there should be a blank component outline in that area for that(L4), and C91. Refer to the circuit diagram at http://www.hfsignals.com/index.php/2017/11/23/bitx40-circuit-description/

That 4.7k resistor is only needed for proper operation of the uBITX.

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