[Lowfer] Icom R75 Frequency Jumps

[pbunn]

Todd,

Did you use Jays circuit for GPS locking your R75?

Pat Bunn
N4LTA

-----Original Message-----
From: lowfer-bounces at mailman.qth.net [mailto:lowfer-bounces at mailman.qth.net] On Behalf Of ToddRoberts2001 at aol.com
Sent: Wednesday, August 07, 2013 10:42 PM
To: lowfer at mailman.qth.net
Subject: Re: [Lowfer] Icom R75 Frequency Jumps

John thanks for the heads up on the problem with the noisy PBT dual  pot control in the Icom  R75. I'm not sure how hard it is to access those pots? Do you have to pull the front panel off and is it a very involved  procedure?
 
My thinking is if someone has a currently good working R75 one could extend the life of the pots with a good shot of Deoxit F5 fader lube into the pots? The Deoxit F5 has restored some pretty noisy pots for me in the past. It might be good prevention to put some lubricant in those pots if possible. Could someone do it with those pots, or are they  sealed?
 
Another thing I am doing with my R75 is I leave the top cover off all the time.
 I have discovered that leaving the top cover on literally turns the chassis of the R75 into an oven. After being turned on for an hour or so many parts inside were almost too hot to touch. I am sure this would shorten the life of some components like the electrolytic capacitors and possibly others.
 
I found leaving the top cover off allowed most of the heat to escape so most of the components are now cool to the touch and a few that were very hot before are now barely lukewarm.
 
Icom did not provide for any air circulation with the top cover on.
There are no louvers or vents for the air to circulate. One project I am working on is to build a new top cover using perforated metal which would look a little better than leaving the top wide open. But it  is worth it to have a cool-running R75 and it is used indoors all of the  time here anyway so it is not exposed to any outside weather.
 
Another benefit of having the R75 locked to GPS is the radio doesn't  need to be turned on all the time to help stability like with the  internal crystal.
It has instant-on stability with the external GPS standard connected, so it is good to go with ARGO right after turning it on and the rest of the time it can be left turned off when not in use.
 
Thanks, 73 - Todd WD4NGG
 
 
 
In a message dated 8/7/2013 6:58:54 P.M. Eastern Daylight Time, w1tag at charter.net writes:

The pots were made by Toko, and have been discontinued. But Icom seems  to have a good supply at 16 bucks apiece. Since I had also been having  issues with audio volume jumps, I picked up replacement AF/RF gain controls  as well
 
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