Today I was looking at online benchmark tests of some HF rigs running transverters for VHF. Depended on the rig and the NF of the transverter, but sometimes the high-end transverters on otherwise average base station HF rigs had NFs close to 1, 1.2, etc. Excellent, compared to the IC-910H (around 8 I think) or even the IC-9700 (around 3 something). What I could not find, is what is the typical noise factor of a VHF or UHF rig. Say the IC-7100 in FM or USB on 2m or 70cm, or a random VHF mobile. Maybe thats in brochures and called something else. But a ballpark figure--its like '20'--would be nice if you know it. Trying to compare that on HF is difficult too. On some bands the SDRplay 1A as a NF of 8. Then above 100MHz or so its around 3. At 3 thats already better than a IC-910H is supposed to be on the chart I saw. In a perfect world I run all SDRs to high quality transverters even on 2m, on up. I've done some FM-only contesting and I'm curious where the average 65w FM mobile rig is, the average HF + VHF rig running SSB, etc. Maybe running a simple SDRplay is enough to get a NF down to 3 really cheaply. And a LNA to get it even lower. And get abilities to see a whole band to catch infrequent activity, without having to co stantly spin a dial. Its almost enough for me to think to run a SDRplay for RX on these bands (NF around 3) and just use the rig for TX. Economically speaking I mean. Its also in my head that a decent LNA sort of makes up for a lousy rig NF. Is that basically correct? When I compared HF figures, SDR rigs to non-SDR ones, initially I was surprised that SDR rigs (even high end ones) were frequently less sensitive. But then again, their dynamic range seems to more than make up for it. Thoughts?