Aphex Dominator II - How does it work and an easy fix
This is one of several Dominators I got in for look-over and any repairs needed. Most of them were cleaning switches and pots and checking capacitors and function. I thought you might like to see how they work why they are still in service. Enjoy. ... https://www.youtube.com/watch?v=HF8E278DYwU
A customer brought me in a Kenwood TS-480SAT transceiver that had low power and very distorted transmit audio. In this video I repair the transmit and do a full transmit alignment including the idle current setup for the output transistors. Nice radio for either a mobile or base station with a big power supply.
The give away is over. Maybe I will do more in the future.
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https://www.youtube.com/watch?v=btccegtvumQ
I got a piece of equipment in to fix and it requires a composite input. I don't have anything that has a composite output at the moment so I decided to buy a little kit that will take Left/Right audio in and output composite stereo with a 19KHZ pilot. Lets put it together, together.
Where to buy the kit.
http://electronics-diy.com/product_details.php?pid=35&name=NJM2035%20Stereo%20Encoder%20/%20Multiplexer%20Kit
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https://www.youtube.com/watch?v=3d0m7lVG2yU
This Comrex Access came in with the complaint of a flakey power connector. Lets take a look at it and see what we can do.
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https://www.youtube.com/watch?v=U8NYmVAfqIQ
I found this in a thrift store for $9.99. Here I take a look at it and see how good, or bad, it is and do a little repair work too. It was scratching the DVD on the way out. Interesting fix.
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https://www.youtube.com/watch?v=Oo3oKHbgW7E
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 got really lucky on a 'make offer' on EBay and acquired a new toy for the bench. Lets use it to fix a Belar FM modulation monitor.
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https://www.youtube.com/watch?v=jxwInO0ojPY
This is the first in a series of QuickTakes. This one shows how different resistors affect RF and what it could to your circuit. Complete with spectrum analyzer screen.
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https://www.youtube.com/watch?v=HH_faUXLEnE