so ive been running my 7300 for about two years now and always kinda bugged me that the reference oscillator wasnt as stable as id like, especially when im doing weak signal stuff on 17m and sometimes 10m when the band opens up weird. you know how it is, slight drift when the rig hasnt fully thermaled out and youre trying to hold a freq.

anyway i finally pulled the trigger on the TCXO-3 upgrade from Icom. not exactly cheap for what it is but the install was pretty straightforward if youre comfortable taking the lid off. just that one board swap essentially. i did it on a Saturday afternoon, had it back together in maybe an hour and a half including me being overly careful about the RF shield clips.

honestly? the difference is noticeable. cold startup is way more stable now, frequency doesnt wander nearly as much in the first 10-15 mins of warmup. if youre doing any kind of digital work or you care about dial accuracy below like 10hz resolution it actually matters. probably overkill for just casual phone ragchewing but for what i use the radio for i think it was worth the like 50-60 bucks.

anyone else done this one or done other mods to their 7300? curious what else people have found worth doing vs not

yeah I did the same mod maybe 8 months ago. agree its worth it for digital modes, i was having issues with FT8 decode rate being slightly worse than expected and after reading around figured the oscillator drift during warmup was part of it. after the swap my decode numbers came up noticeably in the first few minutes of a session. the install is easy, honestly the hardest part is just not losing those tiny screws when you open the bottom panel lol.

one thing i also did around the same time was the fan mod — there's a resistor swap that makes the fan kick in earlier and run a bit faster under load. doesnt make a huge difference thermally but its one of those things that makes you feel better about running the rig at 100w for extended periods. if you havent looked into that one its pretty trivial to do while you already have the covers off.

i havent done the TCXO on mine yet but ive been thinking about it. mostly i run PSK and JS8 so yeah the drift thing is real, i just compensate by letting the rig sit for 20 mins before i care about accuracy which is kinda annoying. might just do it. the fan mod the other guy mentioned is interesting too, i run split with a linear sometimes and the 7300 does get a little toasty.