[time-nuts] low-loss cable

Robert Darlington rdarlington at gmail.com
Mon Jun 13 12:21:33 UTC 2011

Hi Dick,

See page 27 of this document (as numbered at the bottom of the page, or PDF
page 29):

The Trimble Bullet antenna for the TBolt has ">28dB gain" and they recommend
RG-59 coax.  Brooke's page ( http://www.prc68.com/I/ThunderBolt.shtml#Ant )
mentions the TBolt is happy with an antenna gain between 18 and 35dB.   He
also mentions to watch out for the voltage to the antenna.   A lot of newer
antennas run on 3.3 volts instead of the 5V being injected up the line by
the Thunderbolt.    I'm having a problem with Symmetricom clocks at work
where they switched to injecting 12 volts up the line (previously models
were 5 volts) so I had to get up on the roof and swap antennas.


On Mon, Jun 13, 2011 at 1:56 AM, Dick Moore <richiem at hughes.net> wrote:

> Once again, thanks to all. The Lucent bullet antenna has an N connector on
> the base, so I'll just use RG-6 which I have enough of, and live with a
> bigger trough through the window frame or just go ahead and bore through the
> wall -- I originally cut the slit in the window frame to accommodate the
> Hawk patch antenna's permanently attached very small diameter cable and I
> didn't want to mess with removing and installing the BNC connector on the
> other end on that tiny stuff in order to take it through the wall. But with
> RG-6 or RG-59, no such problem.
> Now, question 2: fluke.l says that the Lucent bullet will work fine with
> the TBolt -- but is there any chance that the 26dB gain of that antenna and
> its preamp will cause the TBolt pain?
> Best,
> Dick
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