so ive been sitting on doing this for about a year now and finally just did it last weekend. the mars/cap mod on the IC-7300 is pretty straightforward, just the one jumper on the board, took maybe 20 minutes including the time i spent second-guessing myself and looking at the photos again. transmit now covers the full range without the rig complaining at me.

while i had it open i also went ahead and swapped out the stock fan for a Noctua NF-A4x20 which honestly should have been done day one. the original fan is... not quiet. the noctua runs so much cooler and barely makes any noise at all. i was skeptical it would move enough air but temps look totally normal under extended digital operation which is where i was getting a little worried before.

anyone else done any other worthwhile mods to the 7300? ive seen some stuff about the display brightness mod and the ref oscillator upgrade but not sure if the TCXO swap is actually worth the money for general HF use or if thats more of a you-need-it-for-specific-things situation.

the TCXO question comes up a lot and honestly my take is it depends on what youre doing. for regular SSB and even FT8 the stock oscillator is fine, the software does enough correction that you wont notice. where it actually matters is stuff like weak signal VHF work or if you're doing any kind of coherent operations or WSPR where you want your frequency accuracy to be really tight over long periods. i did the upgrade on mine mostly because i had the rig open for something else and figured why not, but i wouldnt specifically open it up just for that unless you have a reason.

the fan mod is the real quality of life improvement, totally agree. mine was making this faint whine on certain RPMs that drove me crazy during quiet CW sessions. noctua fixed all of that.

i did the ref oscillator swap on my 7300 about 8 months ago and i honestly cant tell you if it made a practical difference day to day, like the radio just works and everything seems fine. did a bunch of FT8 before and after and the decode rates looked similar. maybe i was hoping for some obvious improvement that wasnt really there for my use case. the fan mod though yeah that one you feel immediately, its a totally different radio to sit next to for a 2 hour pileup session.