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I have a new FT-911A and I’m researching expanding Tx on HF and VHF/UHF but It’s a little confusing. I had a FT-991 a few years ago, back then I watched a YouTube video that gives you HF Tx only so did the MARS mod shown (bridged JP3003). It was more disassembly then I like but it was worth it. It’s been a few years and I do a little horse trading and one of the newer FT-991A has been added to my stable and I’m wanting to take a look inside. Surely after all this time and the vastness of the World Wide Web I can learn something new and someone has cracked the VHF/UHF Tx side of this radio but no joy :/

Here’s what I got so far: I found some photos in descriptions of how to mod this radio and I noticed how some pictures show JP3001/JP3002 with micro-min chip resistors and others show them simply bridged hmmm...

Any mars mod should be available from your Mars co-ordinator.. Also,,if Mars uses vhf uhf...
Any other,, suggests use in un-authorized frequencys and is probably why you have had no replys , as most hams will not assist in messing up a prefectly good radio.

hello, I wanted some information on the ft-991a, the just bought I wanted to know how to do the bandwidth expansion on vhf uhf, I found they are like expanding the hf doing jp3003 jumper, instead I do not find how to expand the vhf uhf now the radio in tx 144-146 mhz there is a way to go in tx up to 148mhz, perhaps because the European version? I ask you for help as I wait for your answer. Thank you.