[time-nuts] HP3325B as LO for a transceiver or receiver? Phase noise?
Brooke Clarke
brooke at pacific.net
Tue Jan 1 23:43:08 UTC 2019
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
>> manuals at 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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