[time-nuts] GPS antenna gain

[David McGaw]

Yes, more correctly I used 2 power inserters, one each way, to shunt 
the antenna power around the attenuator so that the antenna is 
powered and the GPS receiver sees the antenna as connected.

David

At 08:50 PM 1/14/2009, you wrote:
>And I did not make myself clear.
>
>If you were using power inserters, I expect one was used coming from
>your GPS receiver and you shunted the DC voltage around the attenuator
>and re-inserted DC voltage back to the antenna.
>
>
>
>Brian Kirby wrote:
> > Can we clarify, you were using the DC blocks or were they power inserters ?
> >
> > Brian
> >
> > David McGaw wrote:
> >> Hello Gents (and Ladies),
> >>
> >> I am in a bit of a quandary.  I have been using a Synergy Timing 3000
> >> GPS antenna in a test set-up for some time and recently got a VIC-100
> >> antenna, thinking that its greater spec-sheet gain (38dBi vs 25dB(i?)
> >> typical) would allow for a longer down-lead in the field if
> >> needed.  Upon testing, the VIC-100 appears to have around 10dB LESS
> >> gain than the Timing 3000 and I would say is barely adequate on 25 ft
> >> of LMR-195!  I used a switched attenuator pad with 2 DC blocks for
> >> the test and set each antenna to comparable SNR levels as indicated
> >> using TAC32 with an M12M-T.  I have tried a second VIC-100 with the
> >> same results.  Would anyone have an explanation for this?
> >>
> >> Thanks,
> >>
> >> David McGaw N1HAC
> >>
> >>
> >>
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