[EdHolland]

The Racal is a very clever design, which achieved very high stability and good image rejection in a time long before frequency synthesis. I'd love to own one. The "Barlow-Wadley Loop" circuit configuration allows for a high first IF frequency, but cancels the oscillator drift with clever down conversion. The early Yaesu (FRG 7 and FRG7700) receivers, amongst others, use a similar circuit scheme.

https://en.wikipedia.org/wiki/Wadley_loop

More on the RA17:

https://www.electronics-notes.com/articl...l-ra17.php


Alignment, so I understand - and see in the video - is certainly not you're typical superhet procedure.

Cheers

Ed