The antenna tuner can dramatically increase the RF signal level when the antenna is resonant.There are many places to turn up or down gain levels. Questions immediately arise when trying to set the proper receiver gain. Hence, the RTL-SDR should be able to perform just about as well as it ever will in this situation. By the time the RF signals get to the 1st IF mixer, they have already been filtered by the low-pass band filters of the parent receiver, which effectively eliminates interference from local high power FM stations that can degrade the performance of the RTL-SDR. There is a big advantage to have the RTL-SDR on the IF of a good multi-band receiver. But first I wanted to know just how good is the SDR receiver really?
I set up the RTL-SDR and various software components as described previously. So this could be a simple enhancement of the existing receiver if it really worked. The WSJT-X program is happy to decode signals with this audio bandwidth, but the native IC-751A only has about 2.8kHz audio bandwidth on the upper side band mode. My first goal was to see if I could receive the complete JT65 and JT9 signal band, with both modes usually in a band region up to 5 kHz wide on the digital sections of the main ham bands. Once I had the RTL-SDR radio working as a pan-adapter for my IC-751A, I quickly became interested in seeing what I could do with all of those signals that were apparent on the SDR radio’s waterfall.
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