[time-nuts] (no subject)

[Bob Camp]

Hi

It's not that the TBolt is noisy, it's that good phase noise is a whole lot of db down. If you look at the posted plots, there is a lot of digital crud in them even with a good supply. The TBolt innards are the most likely source.

Bob

On Aug 20, 2010, at 1:00 PM, "Mark J. Blair" <nf6x at nf6x.net> wrote:

> 
> On Aug 20, 2010, at 5:07 AM, Bob Camp wrote:
>> The TBolt OCXO does have good noise characteristics. Unfortunately you have to pull it out of the unit to figure that out.
> 
> Is its phase noise substantially worse when it's in the unit? I.e., is the rest of the TBolt adding a lot of phase noise to its output via its power and/or tuning voltages?
> 
> I'm powering my TBolt with an HP 6236B bench supply rather than the cheap open-frame switcher that came with it. Based on what I read, powering the TBolt with a switcher adds a lot of noise/spurs to the OCXO spectrum. My unit has the Trimble-marked OCXO, which I gather is supposed to be a lot better than the Piezo-marked one. My TBolt is presently just screwed onto the top cover of the 6236B, which is probably far from optimal. I have the whole setup installed in a closet, so at least it doesn't get nailed with a blast of cold air every time the air conditioner turns on.
> 
> 
> 
> -- 
> Mark J. Blair, NF6X <nf6x at nf6x.net>
> Web page: http://www.nf6x.net/
> GnuPG public key available from my web page.
> 
> 
> 
> 
> 
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
>