I tried it. It’s exactly what WRAK968 said. -60dB would be Max with the noise floor, and the sweep is real slow. I’ve tuned lots of similar devices, I took mine over to friend with a service monitor to see how close I was. Best I could do was about -60 on 466.52 vs the 467.575 I was tuning for. If you nailed it you would be lucky. My repeater had RX desense because I tried the NanoVNA, now it’s a 20 mile repeater once I put the Amazon duplexer on the service monitor.