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 shows you the mod for 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.I could post the screenshots of each but this is a text only forumLoggedPages: 1.
![Yaesu Ft 991a Mods Vhf Jp3001 E Jp3002 Yaesu Ft 991a Mods Vhf Jp3001 E Jp3002](http://radioaficion.com/cms/wp-content/uploads/2016/10/FT-991A_yaesu-2.jpg)
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The US version has 2x resistors, they appear anyway, in JP3001 and JP3002. They are marked with '000'. The mods.dk site shows solder bridges in these places. I assume the 'resistors' are 0 ohms.
I tested continuity across them.I do not know if this will expand the VHF coverage or if there is something else in the radio/software that affects it. You may check the firmware in the radio. There are updates available. The US version of the yaesu website has the downloads for the software updates (NOTE: there are different ones for the FT-991 and the FT-991A. I made that mistake and bricked the rig with the FT-991 version on an FT-991A, then realized my mistake and went through the flashing process again - radio works fine now).Check the thread I created on this for more notes.