Using an ICOM IC-7610 into an amplifier which is connected to an 800W homebuilt dry dummy-load for testing. Now I could drag one of the Spectrum Analysers up to the shack or bring all the AR-equipment downstairs (fat chance). So I decided to use my trusty old SDR-IQ. As this is not an accuracy test/measurement rather a quick check to see how the signal looks before it goes out into the ether. Using an SDR and a PC makes it easier to snap pictures of the result for later comparison.
Here is a quick view of the setup:
TRX : IC-7610
AMP : SPE
LOAD: 50Ω 800W with 40dB Tap
ATT : 20dB
RX : SDR-IQ
PC : Laptop with Spectraview 3.39 connected to RX via USB2
The below picture shows me what my transmitted signal looks like. Instead of using my Elecraft two-tone generator I was using my voice and by creating a rather harmonic rich sound (don't ask, the wife came running in and thought I needed attention) the below spectrum showed up on the "Spectrum Analyser".
And here is my Voice caller, calling CQ ....
And here is a spectrum display using a TX bandwidth of 2800 Hz, 100-2900.
Here you can see how my ICOM IC-7300 fared when checking the output signal.
Here is a device you could use to monitor your transmission with a cheap SDR receiver, a CRO or a Spectrum Analyser.
And below is a spectrum plot of my signal on 20m:
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