[Elecraft] K1 tuning range ideas/questions

[Don Brown]

Hi

I did this on one of the K1's I built a while back. To change from 150 kHz 
to 80 KHz you change a capacitor from 120 pf (I think) to 82 pf. If you want 
100 KHz then use 100 pf. Use a NPO type cap or you may get too much 
frequency drift. I looked for 20 turn pots also but all of the pots I found 
are too big to fit on the front panel and cost $50 to $100. However there is 
a metal shaft version of the pot used in the K1 that has a better feel and 
is more rugged and only cost $13 from Mouser. I have installed this pot on 
the five K1's I have built for people.

Don Brown
KD5NDB


----- Original Message ----- 
From: "David Toepfer" <davetoepfer at yahoo.com>
To: <elecraft at mailman.qth.net>
Sent: Wednesday, September 14, 2005 5:56 PM
Subject: [Elecraft] K1 tuning range ideas/questions


> I know the K1 comes with a standard tuning range choice of 2 (80k or 
> 150k).
> But I was wondering if it were possible to do something like 100k.  I ask
> because there is almost a concensus that the 150k tuning range is too 
> fast, so
> I would like to avoid this.  But I would also like access to 3.575-3.585, 
> which
> seems beyond the 80k tuning range choice.  I suppose I could just choose 
> 150k
> and buy a 20-turn pot and have the best of both worlds.  And if this were 
> the
> case, I wonder if I could make a 250k tuning range with a 30-turn pot.
>
> Help/Feedback?
>
> David, K3TUE