[time-nuts] GPS antenna gain

Brian Kirby 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 ?
> 
> 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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> 
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