K1 tuning range ideas/questions

[David Toepfer]

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
.

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[Don Brown-4]

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" <[hidden email]>
To: <[hidden email]>
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

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[Don Brown-4]

Hi

The metal shaft pot part number for the K1 is 652-3540S-1-104 from Mouser
Electronics. The last time I ordered some they were about $13 plus shipping.
When mounting do not use the plastic washer that came with the K1 pot. Use a
nut then the star washer then the panel followed by the flat washer and nut.
adjust the back nut so only one or two threads are showing on the top nut.
This moves the pot shaft and VFO knob back closer to the panel. I think this
looks better with the knob close to the panel.

Don Brown
KD5NDB


----- Original Message -----
From: "Bart W0IIT" <[hidden email]>
To: "Don Brown" <[hidden email]>
Sent: Thursday, September 15, 2005 9:59 AM
Subject: Re: [Elecraft] K1 tuning range ideas/questions


> Don,
>
> Would you know the part number for the metal shafted pot you have used?  I
> have my K1 tore down to put the backlight mod in---perfect time to change
> out the pot!!
>
> tia es 72, Bart
>
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[Bill Johnson-10]

Don,

What is the part # as I am thinking about building a K1 for my arsenal...
along with some other elecraft stuff.

Bill

K9YEQ

K2-#35

KX1-#35


-----Original Message-----

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
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[Bill Johnson-10]

Don, Got the number from your later response.  I read from oldest to latest
so didn't notice it.

Bill


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