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From: Cursitor Doom <cd999666@notformail.com>
Newsgroups: sci.electronics.design
Subject: "Sampler??"
Date: Sun, 28 Jul 2024 17:31:52 -0000 (UTC)
Organization: A noiseless patient Spider
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Gentlemen,

I'm in the process of trying to track down a fault in my main HP spectrum 
analyzer. I've narrowed the issue down to the area of this "sampler" which 
is part of a phase locked loop. I'm not sure I fully understand its 
function, however. In particular, I'm extremely confused as to why they're 
calling it a "sampler" because when that term arises, I typically think of 
something doing akin to what a sampling oscilloscope does: noting voltage 
levels at predetermined intervals. AFAICS, this "sampler" is doing no such 
thing. It's just a harmonic mixer, surely? If not, I must be nuts. YOU get 
to decide!

Block diagram here: https://disk.yandex.com/i/YXcGssgDXwVEbg

Short functional description here: 
https://disk.yandex.com/i/k7YTYTGjHltsGw