Most hams buy an SDR RCVR to monitor the bands. I found this unique application for the SDRplay RSP1A as a Spectrum Analyser for your test bench. The RSP1A is know for it's level accuracy and high sensitivty. This make the RSP-1A an excellent candidate for making accurate measurements that normallly rrquire a high priced piece of test equipment.
The Spectrum Analyser is based on an Application written by Steve Andrew. This is an Alpha version of the software (v1.0a) and may be downloaded from the SDRplay web page including the User Manual.
The current Devices supported are also listed on the SDRplay web page.