so ive had my 7300 for about two years now and finally got around to doing the mars/cap mod to open up the tx range a bit. pretty straightforward honestly, just the jumper on the board, took maybe 20 minutes including the time i spent second-guessing myself with the screwdriver. but while i had it open i also noticed a few other things people talk about doing and im kind of on the fence about some of them.

the one im most curious about is the fan mod, swapping the stock fan for a quieter one or running it off a different voltage to slow it down. mine isnt obnoxiously loud but on long digital modes sessions it does spin up and its just kind of there in the background. has anyone actually done this and noticed a real difference or is it one of those things that sounds better on paper than it actually is in practice.

also saw some stuff about the ref clock upgrade for better frequency stability, some tcxo replacement deal. i mostly do ft8 and some ssb ragchews, not sure if that level of precision even matters for what im doing but curious if anyone has done it and whether the rig felt any different afterwards. probably overthinking this stuff but i had it open anyway so now i keep looking at it like theres more to do lol

did the fan mod on mine probably a year ago, used a noctua 40mm fan, had to do a little wiring work to get the voltage right but its dead quiet now. honestly its one of those quality of life things that doesnt show up in any spec sheet but after living with it you cant imagine going back. the rig runs fine thermally, i checked temps during a couple hours of js8call and nothing got scary.

the tcxo thing — i mean for ft8 youre probably fine without it, the stock oscillator isnt terrible. where it actually matters is if you wanna do things like wspr beaconing and care about being dead on frequency, or if youre doing any weak signal vhf stuff where frequency accuracy starts to actually matter. for ssb ragchewing and ft8 you wont notice it at all. save the money or put it toward something else honestly.

yeah the mars mod is pretty harmless on those radios. i did mine like day two of owning it, old habit from the 706 days where you kind of just did it automatically. fan mod sounds interesting, my shack gets warm in summer and i always wondered if the stock cooling was really adequate for heavy digital use. might look into that noctua option.