[time-nuts] ok, newbie questions

Bob Camp lists at rtty.us
Fri Nov 26 18:01:12 UTC 2010


Hi

First option would be to dig into what you already have. There may be a pretty good OCXO in something on your bench.

Any TBolt with a date code past 2001 should have a good OCXO in it. It's plenty good enough for what you are trying to do.

Bob

Sent from my iPhone

On Nov 25, 2010, at 11:48 PM, "W2HX" <w2hx at w2hx.com> wrote:

> Hi all, I am sure my questions have been asked before. Unfortunately, the
> mailman style archives are so hard to search through. So forgive me my
> transgressions. Happy will I be to get a reference to an old thread that
> answers my questions. Don't need new answers if old ones suffice. (of course
> new answers always welcome!)
> 
> I am looking for a 10 MHz standard for my lab.  Accuracy/stability probably
> wouldn't make a hill of beans difference in the stuff I do, so my questions
> are more academic and it's just nice knowing I have a "really good"
> standard.
> 
> 1. So from reading about this topic on KE5FX.com I understand that a better
> ocxo makes for better phase noise and near-term quality.  I also understand
> that some later tbolts had a very good ocxo in them and therefore would not
> benefit significantly from an upgrade as ke5fx did using an HP 10811 unit.
> I am considering a thunderbolt advertised on ebay by "flyingbest." I will be
> traveling to China (mainland, and Hong Kong) on business the last two weeks
> in December so I might save some shipping.  Here is a photo. Can anyone tell
> me if this unit has a  "better" 10811-class ocxo or "not so good "ocxo? I
> also understand that not all ocxo's are created equal, even if they are the
> same model number.
> 
> http://tinyurl.com/2dg2dz3
> 
> 2. Other GPS DO units seem to differ on the number of satellites they can
> receive from simultaneously (channels). What is the net effect of having a
> standard that can see 6,8 or 16 birds? Is noise averaged out? Is
> stability/phase noise improved? Here is an example of a 16 sat unit.  Anyone
> have any experience with this unit? Good/bad indifferent? It seems they can
> be had for about $200.
> 
> http://tinyurl.com/2ad5kls
> 
> 3. And then there is the venerable HP units like this one.  I understand
> this uses the 10811 ocxo. Other than the better ocxo, is there anything
> inherently superior about these HP units to warrant the additional cost? Or
> are we mostly just paying for the HP name?  This one is 6 sats.
> 
> http://tinyurl.com/24tkwdv
> 
> Lastly, my use of a 10 MHz standard will be for use in equipment like
> microwave counters (EIP 548A), Spectrum analyzers (HP 8658B) VNA's (HP
> 3577A, 8753C to 6 GHz), synthesizer (HP 3326A and HP 8662A), premium
> receivers (Harris 590H), etc., etc. For these purposes, is a GPS DO advised,
> or perhaps a rubidium standard? For example, I don't need this to power a
> clock. Just a good, clean, stable signal with low noise, low spurs, etc.
> 
> What's the overall opinion? THANKS !!!!
> 
> (here's to hoping this message looks better than the first two tests I made)
> 73 Eugene W2HX
> 
> 
> 
> 
> 
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