----- Original Message -----
From: Tom Weigel
To: richard radke
Sent: Sunday, January 28, 2007 3:07 PM
Subject: Re: [drakelist] R-4B PreSelector Issue
Rick:
Here are the calibrator marker s-meter readings for the various bands on my
R-4B:
1.5 - 30.0 mhz no readings found
3.6 mhz S7
7.3 mhz 35-Over S9
14.2 mhz 20-Over S9
21.1 mhz 15-Over S9
28.6 mhz 20-Over S9
Thanks,
Tom, ABØJ
----- Original Message -----
From: richard radke
To: Tom Weigel
Sent: Sunday, January 28, 2007 1:53 PM
Subject: Re: [drakelist] R-4B PreSelector Issue
Tom,
How strong is the calibrator marker on the other bands?...Should be at least
S9, even on 10
Rick W9WS
Tom Weigel wrote:
Hello:
With the exception of 40M, where the set performs very well, my R-4B has
extremely weak or nonexistent PreSelector peaks and extremely weak receive.
This happens whether operating standalone or in transceive with my T-4XB.
The previous owner installed a small breadboard circuit described on an
accompanying hand-drawn schematic as "Improved Product Detector Using MC
1496L," from the December, 1977 issue of Ham Radio. I think that this mod was
originally meant for the R-4C, but I really don't know. I also suspect that
the previous owner could have only used these Twins on 40M. Again, I am
guessing!
I have gone through and cleaned all of the bandswitches with Q-Tip and
DeOxit, lifting off some tarnish from the circular switch surfaces.
Is a complete realignment session in order for my R-4B? Bad crystals?
Anyone else have additional ideas?
Thanks in advance,
Tom, ABØJ
Minneapolis, MN
