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From: Cursitor Doom <cd999666@notformail.com>
Newsgroups: sci.electronics.design
Subject: Re: "Sampler??"
Date: Sat, 3 Aug 2024 20:43:12 -0000 (UTC)
Organization: A noiseless patient Spider
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On Sat, 03 Aug 2024 12:34:44 GMT, Jan Panteltje wrote:

> On a sunny day (Sat, 3 Aug 2024 11:27:15 -0000 (UTC)) it happened
> Cursitor Doom <cd999666@notformail.com> wrote in
> <v8l46j$3e34d$1@dont-email.me>:
> 
>>>>There are several IFs, none of which none are 21.4Mhz according to the
>>>>notes in the text. They state the IF changes according to band, so
>>>>it's 3621.4Mhz for band 0, -321.4Mhz for band 1 and +321.4Mhz for
>>>>bands 2, 3 and 4.
>>> 
>>> Page 10 of the manual, quote:
>>> rear panel IF outputs
>>>  21.4 MHz IF Output
>>
>>Wow! What a lot of IFs!
> 
> In
>  HP_8566B_troubleshooting_and_repair_1.pdf
> On page 55 see the 24.1 MHz originating from block A4A8A1
>  then pasing through a gain control block A4A5,
> 
> On page 57 you see it being processed
>  selectable bandwidth control A4A4 log amplifer with filters A4A3 log
>  detector A2A2
> and then to the recorder outputs (top left page 55)
> 
> The control part 'A4A9 IF control'
> selects what you want to see.
> 
> So it seems to me the 24.1 MHz is the final filter?
> 
> It _is_ possible the graticule display is wrong not the display it
> self...
> wild guess though, would need to measure some stuff.
> Or maybe one of the PLL loops is locked at the wrong frequency.

I've got several hours tomorrow to look further into this, Jan. I have 
some useful info to apply to the problem........