On the most expensive unit the "Pro" model a remark seemed to indicate that it's gain was dependent on PS voltage 10V to 18V. BUT - that page is a mess of cut and paste. I don't know what you really g

Check out the analysis Conrad posted. {^_-}

If he runs the PA at full steam (which is likely to also give the best dynamic range) there is a serious LOT of room for splitters. An 8 way splitter would work adequately. That's 9 dB so there is a r

Duration, frequency spacing, and any modulation (probably PM of some sort) would be interesting. Post processing to pull out relative timing and the like can also possibly pull out modulation using wi

5V at a whomping 150 mA. That latter may be the show stopper if you try to use your front end's Bias-T. And why that version and not "https://www.tgn-technology-online.com/en/Low-Noise-Amplifier-ULNA3

It appears they require their own power supply with the gain being controlled by the supply voltage. {^_^}

The cheapest one would probably be good enough. The next one up might be slightly better because you get a nice noisy power supply and (possibly redundant) Bias-T tap for it. The most expensive one wo

For listening get the cable out of the picture by mounting it on the antenna. At a guess that will buy you as much as 6 dB noise figure. {^_^}

Roughly speaking where are you located? Are there military or protest sites anywhere near you? That definitely looks like some form of covert comm. {^_^}

Receive them on post processing. But, then you would have to figure out how to demodulate and decrypt them. If they don't all more or less start and end at the same time you may have multiple hopping

Small quibble - an all metal adapter is OK. Avoid adapter cables, though. And a ferrite bead good for the pertinent frequencies on the antenna cable at the input of the filter won't hurt and may help

And select the packing option. That reduces the load on USB by about 1/3. {^_^}

Frequency? {o.o}

Sounds like you have not adjusted the respective front end gains correctly. {o.o}

A cool feature for recording would be to take a 200 kHz wide slice of spectrum and feed that out somewhat as is done in the various SDR servers. Then the uploads might not take two days and a excess o

30 seconds plus a button that saves the last 30 seconds to a file might be nice. {o.o}

Wires are inconvenient; but, they do remove some annoying potential problems. And if you are sitting at your ham station listening you're stuck there for your tuning knob so why no wired NOISE CANCELI

PK - for pure important communications or contesting the old Motorola police or utility radios are, well, designed for speech and if that kills "fidelity" "oh well." If you want easy listening for ext

Normally speaking a shared port would not communicate with each other but would both communicate with a third port. At least that is the way the lower level windows code is setup unless it has changed

Tools menu. Options. Take a tour. You will find all manner of interesting things including com port selections for various things. And your ideal source for help is, believe it or not, https://www.sdd