[R-390] 10-turn S-meter zero pot

David Wise David_Wise at Phoenix.com
Sun Feb 22 13:12:15 EST 2015


Fix the problem, not the symptom.  A simple wiring change makes the original pot work like a dream.  It's archived in the Pearls Of Wisdom.

Dave Wise

________________________________________
From: R-390 [r-390-bounces at mailman.qth.net] On Behalf Of Norman Ryan via R-390 [r-390 at mailman.qth.net]
Sent: Saturday, February 21, 2015 8:46 PM
To: Larry Snyder; r-390 at mailman.qth.net
Subject: Re: [R-390] 10-turn S-meter zero pot

Hi, Larry,
I recall similar difficulty some time ago.  I think somehow you have to detach the bracket sufficiently to swap out the zero gain pot, using your ingenuity.  Fasteners are tricky to reach.
While you're contemplating this, consider using a ten-turn Bourne pot.  Then zero-ing the carrier level meter accurately becomes a breeze.  You won't require a locking ten-turn knob, but it gives a cool look to the IF deck.
73Norman

      From: Larry Snyder larrys at teamlarry.com



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