YouTube user ranickel and creator of the RANVerter HF upconverter for software defined radios has posted a video showing how to use an RTL-SDR dongle and RANVerter to create a panadapter for an old and cheap Heathkit HR-10 “beginners receiver” ham radio.

He connects the mixer stage of the HR-10 via a capacitor to his RANVerter which then connects to a RTL-SDR dongle.