so ive been using an RTL-SDR v3 dongle for about a year now and honestly its been great for what it is, been doing some aircraft stuff, a bit of NOAA weather sat decoding, general scanning around. but im starting to feel the limits of it especially on HF where the direct sampling mode is just... okay. not terrible but not great either.

been looking at upgrading and im kind of torn between the SDRplay RSP1A and just going full send on a HackRF One. price difference is real — RSP1A is what, around $120ish, and the HackRF is pushing $350-400 depending on where you get it. the HackRF can transmit which is cool i guess but im not sure i actually need that. i mostly just want to receive better across a wider range with cleaner noise floor.

anyone actually done this comparison or gone from RTL-SDR to either of these? curious what the real world difference feels like in SDRuno or SDR# or whatever youre running. and does the RSP1A actually do 1kHz to 2GHz as cleanly as they advertise or is there fine print i should know about

had the RSP1A for about two years now and its genuinely a big step up from the rtl dongle, especially on HF. the noise floor improvement is noticeable and the 10 MHz bandwidth is nice when youre watching a big chunk of spectrum. SDRuno has gotten a lot better too, used to be kinda clunky but its pretty solid now. i run it alongside HDSDR sometimes depending on what im doing.

that said the fine print you asked about — yeah, below about 500 kHz things get a little sketchy, and the very top of its range near 2GHz isnt quite as sensitive as lower bands. still way better than the rtl dongle in direct sampling mode which always felt like fighting the hardware. if youre primarily a listener and not itching to transmit id say RSP1A is the smarter buy. the HackRF is cool and i messed with one at a friends shack but the receive performance honestly isnt as good as the RSP1A for pure monitoring, its more of a swiss army knife thing.

HackRF guy here, i'll be the other side of this. got mine mainly because i wanted to experiment with transmitting low power stuff and do some replay testing on my own systems (garage door opener type stuff, nothing sketchy). for that its awesome. but if you just want to listen, honestly the SDRplay wins on receive quality, the HackRF noise figure isnt its strong suit.

one thing nobody mentions enough is the software side — SDRuno is tied to SDRplay obviously but if you want to use the HackRF with SDR# or GQRX or whatever its pretty painless. both work fine with GNU Radio if you ever go down that rabbit hole which... fair warning, you will lose a weekend.