[time-nuts] Thunderbolt power requirements

[Bob kb8tq]

Hi



> On Jan 31, 2020, at 2:16 PM, Brian Lloyd <brian at lloyd.aero> wrote:
> 
> On Fri, Jan 31, 2020 at 12:17 PM Bob kb8tq <kb8tq at n1k.org> wrote:
> 
>> Hi
>> 
>> The better you regulate the 12V, the better the TBolt will function.
>> The OCXO will be very unhappy outside a +/- 0.5V region. It really
>> wants something well regulated (like at the couple of millivolts level).
>> 
> 
> That is the info I was looking for. My T-bolt works very well but all three
> supplies are regulated. So I have to come up with regulated +12V and -12V.


The -12 can be just about anything. Moving it from -10 to -12 has virtually 
no effect at all on the output. You need to regulate the +5 and +12.

Bob

> 
> Depending on exactly what era OCXO your TBolt has in it and how well
>> it is still functioning, ppb level changes for a few percent delta supply
>> are
>> not unexpected.
>> 
> 
> My T-bolt does seem to be working well, at least when compared to the Rb
> and my TCXO-based GPSDO. All three seem to be quite consistent. 10MHz from
> the NTP server is not as stable as the other 3. The 1pps from the NTP
> server wanders +/- 50ns from the 1pps from the T-bolt. All are running from
> the same GPS antenna outdoors with a pretty much unobstructed view of the
> sky. (I have some trees and the peak of my roof up to about 20 degrees
> above the horizon to the S.)
> 
> Thanks Bob.
> 
> -- 
> 
> 
> 
> Brian Lloyd
> 706 Flightline
> Spring Branch, TX 78070
> brian at lloyd.aero
> +1.210.802-8FLY (1.210.802-8359)
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