Hi Jeff:
The key feature of the 3325 is the amplitude resolution. They are called out in the cal procedures for many instruments
because of that and I don't think there's a modern replacement.
--
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 --------
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
_______________________________________________
time-nuts mailing list -- time-nuts@lists.febo.com
To unsubscribe, go to
http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
and follow the instructions there.
_______________________________________________
time-nuts mailing list -- time-nuts@lists.febo.com
To unsubscribe, go to
http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
and follow the instructions there.