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
[email protected]
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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