[AMRadio] National PW Dial

Brett gazdzinski brett.gazdzinski at verizonbusiness.com
Mon Mar 12 13:11:37 EST 2007

As Don said, I don't think you could get a cap to
do that, maybe a pto inductor would work, they seem
to be able to track turns to frequency, although its
over many turns, not just 180 degrees, and it has a
special wound coil I think.

I am no good at marking frequencies on a dial so
they look nice, and things can drift, circuit changes
may eliminate any and all accuracy, so I went to a digital
readout (freq counter off the local osc) on the receivers.

I have not figured out a way to make that work with a VFO,
as its off during receive. A spot switch that turns on
the oscillator tube would work, but the display would be
blank during receive unless its on.
If its on, RF will get into the receivers....



> -----Original Message-----
> From: amradio-bounces at mailman.qth.net 
> [mailto:amradio-bounces at mailman.qth.net] On Behalf Of Byron Tatum
> Sent: Sunday, March 11, 2007 10:20 PM
> To: AMRadio at mailman.qth.net
> Subject: [AMRadio] National PW Dial
> Hello-
>     Does anyone have any information on getting a PW dial { 0 
> to 500 units) to directly correspond to 0 - 500 Khz. in a VFO 
> circuit? I have the National "PW Condensor", a PW dial with a 
> 155 pF. air variable. Thanks, Byron WA5THJ.
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