[time-nuts] Active antennas for a Thunderbolt...

Didier Juges shalimr9 at gmail.com
Tue Jul 31 00:18:02 UTC 2012


Looks like my bullet might be bad.. .

Didier


"Charles P. Steinmetz" <charles_steinmetz at lavabit.com> wrote:

>Chuck wrote:
>
>>I don't quite know what to say about that.  Trimble seems to think
>that bullet
>>antenna is the right thing to use.  Somehow, I would think they should
>know.
>
>I normally use a choke-ring survey antenna, but I also have a Trimble 
>Bullet III, P/N 41556-00 (RoHS version is P/N 57860-10) -- which is 
>the antenna that Trimble recommended for use with the 
>Thunderbolt.  IME, at 35-40 north latitude it works OK indoors (with 
>a plaster ceiling and asphalt tile over wood roof between it and the 
>outside), and flawlessly out in the semi-open (some trees closer than 
>you'd like) with 100 feet of good 75-ohm coax (most birds have a c/n 
>of 48 dB or more).  A Symmetricom cone timing antenna works pretty 
>much the same, with about 2 dB lower c/n.
>
>Best regards,
>
>Charles
>
>
>
>
>
>
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