[R-390] Limiter on R390A vs R390 (need a pot)

Sat Jul 6 08:44:42 EDT 2019

Thanks Larry.  I dug into it and found the problem right away.  The limiter pot is open from end to end and open between the wiper and the end at about 1/3 turn.  Now my problem is getting one to replace it considering the integral switch

Does anyone have one in their parts bin that they’re willing to sell?

Thanks,

John

From: Larry H <larry41gm at gmail.com> 
Sent: Saturday, July 6, 2019 7:49 AM
To: jgedde at optonline.net
Cc: R-390 Forum <R-390 at mailman.qth.net>
Subject: Re: [R-390] Limiter on R390A vs R390

John,  Your 390A definitely has a problem with the limiter.  It should operate smoothly to full cutoff at around 9 (depending on the signal strength).  My first thought would be to check c101 and c536 for leakage, or perhaps r119 is bad.

Regards, Larry

On Sat, Jul 6, 2019 at 4:39 AM <jgedde at optonline.net <mailto:jgedde at optonline.net> > wrote:

Good Morning!

I notice a substantial difference in how the limiter performs on my R390 vs
my R390A.  Let me explain, the limiter on the R390 seems to be much easier
to use as the control performs much more finely and is much easier to
control.  The R390 cuts off completely much higher in the adjustment range
than the R390A.  In the R390A, the limiting action is only up to about 3 or
4 on the dial before it cuts off completely.  Further, the R390A, is nearly
impossible to adjust right to the point of cutoff.  After the adjustment is
made, the action takes a second or two to settle out.  Backing off the
adjustment does nothing for slight movement, then audio comes back suddenly.

I suspect the R390A has an issue but I wanted to confirm that the operation
should be the same or not before I dig into it.

John

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