[AMRadio] National PW Dial


david knepper collinsradio at adelphia.net
Mon Mar 12 13:03:34 EST 2007


I have brand new PW dials if anyone is interested.

Dave, W3ST
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----- Original Message ----- 
From: "D. Chester" <k4kyv at charter.net>
To: <amradio at mailman.qth.net>
Sent: Monday, March 12, 2007 1:06 PM
Subject: Re: [AMRadio] National PW Dial


>    >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.
>
>>It might be possible, by carefully pruning the coil, and adjusting the end 
>>plates of the capacitor by bending them in and out.  It would depend on 
>>the fixed >capacitors used in the tuned circuit.
>
>
>
> Good luck.
>
> It would probably be more trouble than it's worth, since the capacitor 
> will need to be somewhere intermediate between straight-line frequency and 
> straight-line capacitance, and which would be designed to work over a 
> specific, limited range of maximum to  minimum frequencies.
>
> Probably better to just do like National did with the HRO and NC-101 
> series: make up a tuning chart.
>
> Don k4kyv
>
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