Got this in from a viewer. He says the left channel is distorted. I previously built a little kit that takes in Left and Right audio and puts out a composite signal with the 19KHz pilot just for this fix. Lets get to it. ... https://www.youtube.com/watch?v=N-oxViWQkpM
We take a look at a Marti RPT15 transmitter that I believe might be causing some interference with one of my other receivers on a second harmonic. We replace some caps, align the power output and check the spectral purity. Also I show a way to use a very inexpensive SDR radio as a poor mans spectrum analyzer and how to use it to check deviation with the Bessel Null method.
Sorry for the noise and the audio getting a little ahead of the video but you still get the idea.
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https://www.youtube.com/watch?v=D5saWmztWgk
I bought 2 of these things to make 1 good one. That done I realized that the plus and minus voltage indicator did not work right. This is the repair video.
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https://www.youtube.com/watch?v=IdYbs9QONmk
I just thought you all might like to see just how long it takes to completely replace all the caps and switches in a 528E. This is a fairly long video but it could be used as an instructional video on how to do this job the best way. I have re-capped dozens of these things and this method is the best I have come across yet. Please feel free to comment.
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https://www.youtube.com/watch?v=9sBfNFYrxSU
Got this on Ebay for a really good price. Motorola R2200A Communications Service Monitor. Lets see if it works.
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https://www.youtube.com/watch?v=2IWuHmJx4tA
I put the high voltage capacitor tester in a box and wired it up. In this video we will take a look at it and put it through its paces.
The case I used
https://www.ebay.com/itm/294514807311
Link to where to get the board
https://www.antiquewireless.org
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https://www.youtube.com/watch?v=2jLmoWNwYe8
Poor old thing has been in constant service for at least 25 years, possibly more. Client claimed it would start to distort. Lets see why.
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https://www.youtube.com/watch?v=Mq_5fc9DzKQ