One of the great things about the Kenwood TH-D74A is how easy APRS is to use. However I was puzzled for a few days because I could not make it work with my rtl-sdr receiver within my apartment. It turns out my Lenovo W520 Laptop power cord was causing just enough interference to make the TH-D74 think it was receiving a message all the time preventing the HT from transmitting.
At the time, I was developing a python script to extract location data from APRS packets. I had my cheap RTL2832 tv tuner plugged into an Odroid C2 on a different monitor and was watching the waterfall with GQRX. After turning off all other electronics in the house, the spike near 144.390 MHz went away. Trial and error revealed the problem to be with the laptop power supply.
Hooray!
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