On Fri, 30 Jul 2010 20:40:52 -0500, Brian Koontz wrote:
Well, the TR-7 from hell is now a fully operational TR-7 from hell!
Now it's time to get on the air!
Congratulations, Brian! You have been assimilated into the collective.
Resistance is futile.
73
-Jim
--
Ham Radio NU0C
Lincoln,
I have obtained an R4C with many of the Sherwood mods installed
including the solid state 3d mixer which is supposed to eliminate the
dreaded frying crackle. Unfortunately occasionally I hear a bit of
static sounding to me like what a brief solar flare might sound. It is
not really a hiss
Brian Koontz wrote:
Some further investigation revealed that the chassis has warped over
the years, so the two 3-prong connectors on the VCO board were no
longer in a horizontal line. So I was determined to make sure the
board was fully seated on all the connectors.
So, for archival
I had this problem when a crystal filter on the back was not making a good
connection with one of the pins. Wiggle each filter. The static crashes would
occur out of nowhere and last a few seconds. Took me weeks to find it.
73,
Bob WW3QB
--- On Sat, 7/31/10, K4GM- George k...@verizon.net
Bob,
Thanks for that tip for the R4C. I think I'll just DeOxit mine while it
is on the bench being re-capped!!! Isn't this list the greatest??
73,
Don, WB5HAK
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Sandy,
Sorry
for any confusion from my previous e-mail. The TR7 does not understand
digital *directly* from a PC (aka some type of USB, serial or parallel
interface to an accy of PC interface). It really only understand audio
in/out. Many newer radios have direct computer interfaces that allow
George, I had a similar experience with an R-4C that still had the 6EJ7 third
mixer. However, the noise was from the IF Amplifier, V5, a 6BA6. New tube in
and the intermittant solar storm noise was gone.
Bob K9JU
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Same thing on the filter selector switch. Not using the radio will
usually have a switch issue. A bit od deoxit will resolve thAt issue.
Good luck. The third mixer did adequately address the third mixer
prob. Drake had 3 or 4 designs and Sherwood. Solved it all.
A clean and functioning
http://www.chuckg.com/r4brecapping.htm
Note it's incomplete because I haven't done C176 yet, but I'm heading
out of town and don't know when I'll get to that.
I take the pics mostly for my own reference, so if 20 minutes after
removing something some question comes up, I have the pics to refer
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