[R-390] Carrier-level adjustment pot?

[Jim M.]

I have used the Vishay/Spectrol 10-turn pot available from Mouser.  This is 
the one I recall using (it's been a few years):

Data sheet:
http://www.mouser.com/catalog/628/548.PDF

Mouser part number for 100 ohm pot:  59453411101
http://www.mouser.com/search/Refine.aspx?Ne=1447464+254016&Ntt=*59453411101*&Msb=0&Mkw=59453411101&N=1323038

The 10 turn pot will give much better zero adjustment and won't drift like a 
single turn pot.  It's just small enough to fit under the bracket on the IF 
module.

Jim N4BE


----- Original Message ----- 
From: "Barry" <n4buq at knology.net>
To: "R-390-List" <R-390 at mailman.qth.net>
Sent: Tuesday, January 23, 2007 10:57 PM
Subject: [R-390] Carrier-level adjustment pot?


> Can someone tell me which 10-turn pot they've used to replace the
> carrier-level pot in the R390A?  I ordered one, but the little solder tabs
> are pretty small.  Considering two of the original pins had two wires
> running to it, one of which is the 1W resistor, the holes in this pot 
> aren't
> really big enough for the job.  I think I ran into this with my first
> replacement in my other radio and I ended up soldering to the resistor 
> lead
> and/or jumper wire, but don't remember.  Is there a pot that has holes big
> enough to do the job and will still fit under the housing?
>
> Thanks,
>
> Barry - N4BUQ
>
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