Hi Derrick

When I start SDR # to listen on the ISS packet download frequency (I think 430.55 MHz), and point my antenna in the general direction of the ISS, nothing appears in the main panel of the ISS application.

The ARISS digipeater is on 145.825 MHz.

I often use the terrestrial APRS frequency of 144.390 to test a Soundmodem setup. I'm in the Chicago area and there are always lots of packets. I don't need to wait for the next pass to find out if it works. If I can receive OK on 144.390 then receiving on 145.825 generally works.