I had a thought a moment ago, it is entirely possible the Panasonic capacitors Kenwood chose for their factory backup board were designed for ultra low leakage and normal supercapacitors might have a lot higher leakage and be totally unsuited for memory backup.
I have no way of checking this possibility but thought I'd toss it out to warn people what worked extremely well for me might not work for them.
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I just powered up an iCom IC-28A that has not been powered up for at least 6 years. All the memories were there. I'm preparing for a very active severe storm season and our landlords are studying for their amatuer lisences. My wife, the twins, and I want reliable communication in the event of tornadoes.
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I also wanted to open one modified IC-28A to verify how I did it so I can modified 3 others.? ?
The memory cells in all 3 'new' IC-28A are dead.?
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The IC-28A is an older single band transceiver, kind of obsolete to most hams. I don't need 70cm and I got a good deal on these units, $20 each. They were barely used, mainly to monitor several local repeaters.
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