[time-nuts] GPS antenna gain
kirbybq at bellsouth.net
Wed Jan 14 20:50:18 EST 2009
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 ?
> 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?
>> David McGaw N1HAC
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