Been doing some tests of my Elad FDM-DUO on HF bands with my noise-ridden lab environment.  Using my HP E4421B sig gen with 30dB screened attenuator, the minimum discernable signal using PI-RX and JT4A is:
472: -150dBm
1820: -150dBm
3503: -148dBm
5379: -149dBm
7010: -150dBm
10102: -149dBm
14002: -147dBm
18080: -146dBm
21005: -147dBm
24900: -144dBm
28005: -144dBm
28200: -145dBm
28500: -142dBm
29500: -144dBm
50200: -144dBm

I was wondering if I was getting noise from the local environment up the coax outer or power/control leads, but those measurements were made with the coax screen of the HF antenna connected to the radio, so I guess not.

With the antennas connected (at 2200utc), I see a noise floor of -142dBm on 28MHz, only a couple of dB more than with a dummy load. On 18MHz, about the same. Across the bands from 18MHz to 30MHz, I see a few tones and squiggles, worst tones about -120dBm. Looks like I don’t have any significant local noise, at least between 18MHz and 30MHz. Interesting. Bit different on LF and VHF, where I have some work to do!

As ever, this was MY Duo and MY lab, YMMV!

Found this on ebay.  Better than a VXO.

Quick tropo JT65A test with F8GGD, many MS pings though, and no decode.  895km too far under these conditions

Running split using SW2 with two channels on SW2

Recording of GRAVES MS pings at 11:00 on 17th Nov using FDM-DUO SDR rx with Kuhne TR144H 14MHz IF, 9-ele LFA and 0.6dB LNA

XW8BM on 160 tonight, peaked up to very clear 579 for 5 minutes around 23:20-23:25 but nobody worked him.  Spotted him and he disappeared immediately.  Embarrassing!

Step one:  find a WebSDR site and realise you can still copy CW quite fast

Step two:  tie a rock on the end of a rope and throw it into a tree

Step three:  find a reel of TV coax and some transformer wire and a bit of perspex.

Step four: make a 20m dipole.

Step five: retrieve ancient Kenwood from a dust-covered box

Step six: put a 9V battery in ancient homebrew keyer and plug in dusty Bencher paddle.

Outcome: Enormous fun playing in the IOTA contest