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Here's a screenshot of a 'hacked' Pluto transmitting a two-tone signal as received by an Airspy HF+ (probably the best SDR you can buy for reception at 145MHz). As you see, the transmission is nice and clean.
Here's the two-tone setting.
Next week a beta Gemini 1K will arrive at the G4ELI location. With just 10W from an ANAN 10E it'll generate 1 kilowatt without breaking into a sweat.
I spent a day working on transmit support for the LimeSDR. This is by no means finished, but I'm able to say that it works. I have a few problems,
The above are down to my own software, so I'll give myself a good kicking sometime and get this fixed later in 2017 or early 2018.
Here we see the Upper Sideband (USB) signal as received with an Airspy HF+.
And here's the TX panel from SDR Console.