so ive been messing around with a cheap RTL-SDR v3 dongle for a few months now, mostly listening to aircraft and some weather satellites, and honestly it blew my mind how much you can do with a $30 piece of plastic. but ive been eyeing the SDRplay RSPdx for a while now and the price difference is pretty significant. like we're talking 10x the cost roughly.

my main interest at this point is HF — i want to get into MW DX and maybe some shortwave utility stuff, possibly some ham bands once i actually pass my ticket. the RTL-SDR does okay on HF with the direct sampling mod but it feels kinda noisy and the dynamic range seems to fall apart when there's a strong local AM station nearby. i ran SDR# and then tried SDRuno and honestly SDRuno felt more polished to me but that might just be because i'm used to it now.

so the question is — does the RSPdx actually make a noticeable difference on crowded HF bands or am i just going to be paying for specs on paper that i wont really hear in practice. anyone gone from one to the other and can give me a real world take on it

went through basically the same thing a couple years ago. the honest answer is yes, the RSPdx is noticeably better on HF, but how much that matters totally depends on your antenna situation. i was running both side by side into a 40m dipole and the dynamic range difference was real — had a big AM broadcaster about 8 miles away and the RTL would just smear garbage all over the adjacent frequencies, the RSPdx handled it way cleaner. the HDR mode on the RSPdx below 2MHz is genuinely useful for MW DX too, not just a marketing thing.

that said if you're on a random wire or a small loop the RTL-SDR with a good preselector/filter can close the gap quite a bit. and SDRuno has gotten better but it's still a bit clunky compared to SDR# or even HDSDR in my opinion. if you're serious about HF and you're going to stick with this hobby i'd say the RSPdx is worth it, if you're still in the 'poking around' phase maybe grab a Nooelec NESDR or something and wait.

i have the RSPdx and like it a lot but tbh for MW DX the antenna matters way more than the radio. im using a 40 foot longwire out back and even the rtl-sdr pulled in some decent catches on it. the SDRplay just makes it less frustrating when the bands are busy. also SDRuno crashes on my machine like once every hour or so which is annoying, some people swear by it but i keep going back to SDR# with the SDRplay ExtIO plugin just because its more stable for me. ymmv