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That’s odd I was getting the sound with a brand new relay in the other rig then I took the brand new relay and put it into the rig I just got. Could this brand new relay be the problem? interesting!

I don't know what's causing that sound but at slow speed, at least to my ears, the very first part is a bit like the pinging sound made by relay contacts dropping out. That might be a clue but it also

Great to hear the tone, mouse squeak! There is a 0.01 uF resistor off the plat (pin 5) of V17. It joins with a 330 K resistor. Pull this junction point to ground and try the test. Gary W0DVN

That's exactly how I would have played it. My R-4C has a NB because I moved it from one I sold. Steve Wedge, W1ES Time flies like an arrow. Fruit flies like a banana. Sent with [Proton

Never mind I figured out how to play it back at .25 speed. Boy I feel old! But any how what is this sound (at normal speed) caused by?

How do you play it back at .25 speed? Mark

Interesting to play that back at 0.25 speed. Barry - N4BUQ

Here is the sound. Mark

Possible? I just noticed that it's not a particular spot on the dial but rather it is two pieces of metal scraping at every 100 khz of the dial. Mark

Steve I just sent you an email to your email address from QRZ. It contains the mysterious mouse sound. Mark

*** The FR-301 can be had cheaply brand new on Ebay for the Japanese version. This is made to work off 100VAC, but it works just fine off 125. I have one. Somebody took one apart and found that the

How do I send you a recorded sound? Mark

Oh, I wasn't sure because when I looked in my TR-4CW (without RIT) it had all of them in there so I thought that was the way they came? Since I will be keeping my TR4-CW/RIT and eventually selling the

Could be a bent shaft. Watch the skirt as you turn the knob. If the skirt is rubbing on the panel, you’ll need to use one or two 1/4” washers under the skirt to give it extra space. There is not

If you could record the sound, that could help. Else, I wouldn’t be concerned as long as everything’s working find otherwise. Steve Wedge, W1ES Time flies like an arrow. Fruit flies like a banana.

This is how most TR-4C(any) came from the factory. The higher subbands were optional. If it was mine, I’d just get a 28.5 -29.1. Not much around above 29. I’ll look through my pile but I think

Hakko FR-301 is a great tool for desoldering. A bit expensive up front, but over the years may pay off in ease of use and less damage. Really stubborn parts I have occasionally had to resort to the

Thanks everyone! Great feedback/advice that I had not considered. Should make this a lot easier now. -- Craig/W8CS Greenville, SC

In the TR-4CW/RIT that I just purchased, both the 42.5 and the 43.6 Mhz crystals are missing. Anyone know where I can get these from? Mark

Just got my TR-4CW/RIT yesterday. When I turn the main tuning dial to a certain spot it sounds like two pieces of metal briefly scraping together. Mark