Re: Bitx20A bandspread

Charles D. Smith
 

MV109 ... email is ai4ot@... 
Thanks Leonard! Your videos helped me to understand so much when I first started with the bitx radios. 
I’ve got a 6:1 reduction drive on the cap so I do have a fairly smooth tuning range of about 400khz, plus the fine tuning always puts me right on frequency easily. I don’t “need” varactor tuning or a 10 turn pot. (It’s nice on the cw rigs but not “necessary” with ssb signals being further apart usually.)
72/73 de Chas ai4ot



On Apr 23, 2018, at 10:38 PM, kc0wox Leeper <kc0wox@...> wrote:

I've modified many 20a's using the directions on my web page. http://golddredgervideo.com/kc0wox/bitx20amods/varactormod.htm The key is the varactor. I would guess that the one you have doesn't give a 400 pfd variation in capacitance.with an 8n 0r 9 volt variation. What is the varactor diode that you are using? I have used the NTE618 and it has a capacitance range of 20pfd at 8 volts and 420pfd at 1.2 volts. Also acceptable is a MVAM108 or MVAM109 Let me know what you are using. Send me your email address to kc0wox@... and I'll get back to you by email.
Leonard
kc0wox

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