[time-nuts] GPS antenna gain

Brian Kirby kirbybq at bellsouth.net
Wed Jan 14 20:45:40 EST 2009


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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