Take a look at the plots at the bottom of this page.
http://hpmemoryproject.org/technics/bench/3048/hp_sources_02.htm
Note the 8642b vs the 3325B. The '42b has much lower ultimate noise far
out but see how decent the 3325B is in comparison. HP really made great
stuff back in the day!!!
73/jeff/ac0c
alpha-charlie-zero-charlie
www.ac0c.com
On 01-Jan-19 5:32 PM, Jeff Blaine wrote:
I was doing some DR3 testing of receivers fitted with additional
crystal filtering and at the time wanted to find a sig gen that was as
clean as the pair of xtal oscillators which were the baseline. Of
course I never found anything that clean (at least not without
spending a fortune) but do remember the 3325B was exceptionally clean
close in. The tradeoff of that as a source is that the noise floor
does not roll off nearly as fast as something like an 8657b. It lacks
spurs close to the fundamental which are found in all the HP stuff of
the age at least until you get to the 864x stuff.
The answer, as others mentioned, depends on what you are really trying
to do with that rig though. If you want a quick LO source then I
would bet you will have a hard time showing the that rig's performance
is suffering with the 3325B as the LO. At least not without some
pretty specific test criteria setup (e.g. DR3 testing vs. a pure xtal
source).
73/jeff/ac0c
alpha-charlie-zero-charlie
www.ac0c.com
On 01-Jan-19 3:33 PM, Artek Manuals wrote:
The question that remains begging here from the original post (maybe
off topic ?) is how low a phase noise does he really NEED in this
application? We here at time-nuts tend to think in the 10e-12 minutia
area, but In this application ( a HF Communications receiver) the
3325B may be "good enough" that PN wont really be an issue as a
practical matter. Don't see who the original poster is from this
snippet but a possible better place to get a "practical" answer might
be over on the EEVBlog?
Dave
manu...@artekmanuals.com
On 1/1/2019 3:38 PM, Brooke Clarke wrote:
Hi Chris:
The HP 8648 Signal Generator was developed to have low phase noise
that was needed for testing pagers.
See second table of SSB Phase Noise at:
https://prc68.com/I/HP8648.shtml
--
Have Fun,
Brooke Clarke
https://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html
axioms:
1. The extent to which you can fix or improve something will be
limited by how well you understand how it works.
2. Everybody, with no exceptions, holds false beliefs.
-------- Original Message --------
01/01/2019 14:22
Could I use my HP3325B locked to a Trimble Thunderbolt GPS disciplined
10MHz oscillator as the master LO of my Kenwood TS-590S transceiver
that has a LO at 15.6 MHz, or is the phase noise too great? My VK3HZ
gps disciplened LO replacement died recently, I may be able to repair
it but as they are no longer available I am looking at alternatives to
achieve a very stable frequency. Thanks
https://www.febo.com/pages/hp3325b/
http://www.vk3hz.net/XRef/XRef_Home.html
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