[time-nuts] Thunderbolt reception problems

[bg at lysator.liu.se]

Hi Said,

With your background, I assumed you would know better...

What is your antenna gain? What is your antenna cable loss? Does the Tbolt
work correctly connected directly to the GPS antenna? Do you have an
inline LNA to add close to the antenna? Do you have a higher gain antenna
available?

If 10dB is a lot or nost... that DO depend on the circumstances.

--

   Björn

> Hi Bjoern,
>
> I respectfully disagree. I measured the loss through the GPS amp and Mini
> Circuits splitter at only 10.1dB. That's really not a lot. I couldn't
> find
> a loss-spec in the Thunderbolts' specification.
>
> The Agilent amp has GPS filters in it that improve signal quality by
> filtering out all non-GPS signals.
>
> Someone else had the same problem here (that's how the discussion
> initially started) thinking his Symmetricom splitter was dead. I think
> it's  safe to
> say a GPSDO can be expected to work with a name-brand GPS splitter  (which
> it did not either for the other gentleman).
>
> So if the M12+, M12M, and all other GPS receivers I have can all handle
> this signal without a hitch, except the Thunderbolt, then this means the
> Thunderbolt requires special attention (or in my case possibly it's own
> GPS
> antenna).
>
> I will try to change the AMU settings as Warren suggested, that makes
> sense. Maybe this is what we should have tried from the beginning to make
> our
> Thunderbolts work?
>
> bye,
> Said
>
>
> In a message dated 11/21/2009 14:18:51 Pacific Standard Time,
> bg at lysator.liu.se writes:
>
> Hi  Said,
>
> As we talked about some weeks ago... your test is unfair to the  Tbolt,
> but
> that is perhaps intentional. The Tbolt will need more gain to  work. You
> are giving it a signal that is out of  spec.
>
> --
>
> Björn
>
>
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