Hi Richard,
I tried to access the core from the back of the assembly but at least on
this R-4C, the top of the slug is smooth with no indentation. With the
front panel was removed, turning the core from the front was easy once the
anti-turn adhesive was broken. After alignment, I re-applied a drop of
adhesive to keep it from accidentally turning in the future.
Paul, W9AC
----- Original Message -----
From: "Paul Christensen" <w...@arrl.net>
To: "Drakelist group" <drakelist@zerobeat.net>
Sent: Wednesday, October 27, 2010 1:49 PM
Subject: Re: [Drakelist] R-4C Notch Control
Yep, that fixed it. With the front panel removed, I had to turn the
notch coil shaft CCW by about four turns such that the null occurs when
the control is at 12 o'clock on zero beat - as discussed in the manual.
Access to the coil shaft is through a hole in the front chassis, and does
require panel and knob removal. Many Tnx!
Paul, W9AC
I also had problems tuning the notch filter on my R4-B. I was able to
do it from the back but now don't remember exactly how it did it. I think
there is a hex socket on the back of the core. Its just been too long and
I only had to do it once. BTW, this notch filter is _very_ effective when
adjusted right.
--
Richard Knoppow
Los Angeles
WB6KBL
dickb...@ix.netcom.com
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