Russian valve electronics. True, or sort of not true?

[Loose rivets]

I'm confused by that. Surely the 'transmit - receive' rate is not at those frequencies?

I can't imagine the vast coils being able to conduct current in Mhz, the voltages would have to be astronomic at those frequencies.

I thought they just needed to give a short rise-time pulse, and detect the response. I'd imagined this in the hundreds of Hz, not millions.