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VCR139A Panadaptor
In designAmateur radioCRTTest gear
Last updated 25 September 2026
A panadaptor shows a stretch of spectrum around the frequency a receiver is tuned to, so you can see signals before you hear them. This design taps the receiver's IF, sweeps a second oscillator across it, and displays the detected output on a VCR139A.
At a glance
| Display | VCR139A CRT |
|---|---|
| Input | Receiver IF tap, buffered |
| Method | Swept superhet with log detector |
Block diagram
Click a drawing to open it full size.
Documentation
The full design report, schematics and parts list will be published here once the project has been built, tested and filmed.