I should qualify that -- dramatic improvement at low offsets. More than
about 10 Hz from the carrier, the results were the same with either
reference.
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On 4/14/20 11:10 AM, John Ackermann N8UR via groups.io wrote:
Several years ago I did phase noise measurements on a 3325B. The
results are here:
The unit had the standard (not high-stability) oscillator and my
measurements showed a dramatic PN improvement using a high-quality
external reference.
John
On 4/14/20 8:50 AM, Raymond Domp Frank wrote:
Hi Szabolcs,
Thanks for your reaction and pointer.
I have been able to download the 3325B service manual you refer to, from
the Agilent website, no problem...
At least now I've got some numbers re. the phase noise. The qualitative
part is well known of course but as Lord Kelvin said...
Apparently, one needed to buy the option 1 version to get phase noise
specified.
Re. Marc: It seems so much out of character (as far as we outsiders know).
It's annoying and spoils my fun watching his videos. Just banning and no
reaction whatsoever to two polite requests for explanation c.q.
restoration to his known email addresses is rude but apparently
in-character.
It's possible that he saw (/youtube shows?) each iteration of the main
message (I edited it maybe five times in quick succession) as a separate
reaction, much like the individual mail messages that we sometimes get
in a digest with each editing change by a poster but resulting in one
changed online post. Online, I only saw just the most recent version.
OTOH, I'm sure he would have recognized it and could have admonished me
to better prepare and not edit my reactions if he wanted.
I've been thinking about contacting Ken but I'd dislike going behind
Marc's back and Ken does not decide what Marc says in his videos. I
can't imagine Ken not seeing (upfront) what I saw, it's not rocket
science (pun intended). In that respect, it's enough for me that I had
the thought and was able to verify it.
Anyway, I've got some quantitative info on the phase noise subject for
the 3325(B, option 1)...
Raymond
