01-31-2021, 04:00 PM
Some of you may remember that several years ago I bought a Scott SLRM "morale" receiver. It has sat since then, and I have not gotten around to working on it. The fact is, I have not even opened it up to look at it, let alone testing it at all. I have decided that it is going to be my next radio to tackle. I have done a lot of reading of the articles on ARF about these receivers, and the fact that one should use an isolation transformer with them comes up consistently. I looked at the schematic, and was reminded of my old Navy days back during the Vietnam War, and the educational movie they showed us "115 Volts AC, Your Deadly Shipmate."
[Video: https://www.youtube.com/watch?v=E-iN21u6nG8]
I remembered that for safety, neither side of a 115V supply on a ship is connected to ground, to the ship itself, which means that while one can get a severe capacitance shock if you come in contact with one side of 115VAC, it is not a direct completed circuit. In the U.S. power distribution system, one side of the 115VAC circuit IS connected to ground. With the circuit of this radio, that CAN cause problems.
[Image: https://64.media.tumblr.com/0a29c49e1b2c...c92499.jpg]
So, I have ordered a 100 watt, 120V - 120V isolation transformer to use with this receiver. I will see if I can find room for it inside the radio. If not, I will have to make a separate box for it. Stay tuned. Over the next weeks this thread may grow as I tackle this receiver.
[Video: https://www.youtube.com/watch?v=E-iN21u6nG8]
I remembered that for safety, neither side of a 115V supply on a ship is connected to ground, to the ship itself, which means that while one can get a severe capacitance shock if you come in contact with one side of 115VAC, it is not a direct completed circuit. In the U.S. power distribution system, one side of the 115VAC circuit IS connected to ground. With the circuit of this radio, that CAN cause problems.
[Image: https://64.media.tumblr.com/0a29c49e1b2c...c92499.jpg]
So, I have ordered a 100 watt, 120V - 120V isolation transformer to use with this receiver. I will see if I can find room for it inside the radio. If not, I will have to make a separate box for it. Stay tuned. Over the next weeks this thread may grow as I tackle this receiver.
