The band data signal is the same for the FT-450D and FT-991A. I recently?built a cable for my yaesu rigs that is working. The band select table is listed at the top-right of the diagram. Note that the signal is 5 volts. This may allow you to track down which coil/capacitor combination is at fault.

My FC-40 has failed to tune my long wire properly after working flawlessly for the last 4-5 years.? I did some more extensive testing and found this unique result.? It tunes properly on all bands from 15 meters through 6 meters, but below that, I get HSWR reply.? That’s the symptom and it’s the same with my FT-857D and FT891.

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To my knowledge, nothing has changed since I put it up and fastened it in my tree.? It is very difficult to get to it since I can’t climb ladders anymore so I’m hoping to avoid that.? With that, I have a couple questions:

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1. When these two radios are in the “Tuner” mode, do they send band data to the FC-40 or some other kind of control data?
2. Is it possible that a pin (or two) on the control cable could fail that would cause it to not tune the lower bands?
3. If I have to take it down from my tree, I would prefer to troubleshoot the problem myself before sending it to you.? So can you recommend looking at any specific components that might cause this kind of fault, i.e., a specific capacitor or relay or something?

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If I can’t fix it, I will fill out the trouble report and send it in for repair, but I would love to be able to resolve this myself; it’s kind of in the amateur radio tradition.

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Thanks as always for your help,

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Harley Burton

N5BFB

73