[time-nuts] Rooftop antenna and splitter

[Bill Slade]

Hi again,
The very best GNSS antennas tend to be based on suspended patch antenna 
(air-dielectric) structures because they give the best 
bandwidth/radiation efficiency (and hence, noise temperature) 
performance.  The very best include choke-rings for multipath 
suppression (Dorne-Margolin & variants), but these are costly items.  
Miniature ceramic pucks can have pretty horrible radiation efficiency, 
which degrades noise performance, so be careful when buying Chinese 
cheapies.    I have actually seen commercial antennas where resistors 
were added (before LNA) to improve antenna return loss!

On 27.01.19 14:28, Bob kb8tq wrote:
> Hi
>
> With things like the uBlox F9 now out on the market cheap …. I would go with
> an antenna that will do L1 / L2 / L5 and work with everything that it up there.
> You still are in the “under $100” range (delivered) for new product from China.
> It’s a good bet that the guts of all of them are made there. It’s also a good bet
> that they all are ceramic slab style designs.
>
> Bob
>
>> On Jan 26, 2019, at 11:10 PM, Denny Page via time-nuts <time-nuts at lists.febo.com> wrote:
>>
>> Hi all,
>>
>> I’m looking for recommendations on an antenna / splitter configuration. I currently have six GPS/GLONASS/Galileo timing devices, each with it’s own puck antenna in a window. I have an opportunity to move to a (single) roof top antenna, with a splitter to feed the individual devices, and I am looking for recommendations on which antenna and splitter people would recommend.
>>
>> So far, I am looking at the following antennas:
>>
>> PCTEL GNSS1-TMG-26N (https://www.pctel.com/antenna-product/global-gnss-timing-reference-antenna-gnss1-tmg-26n/)
>>
>> PCTEL GNSS1-TMG-40N (https://www.pctel.com/antenna-product/global-gnss-timing-antenna-gnss1-tmg-40n/)
>>
>> And the following splitters:
>>
>> GPS Networking ALDCBS1x8 (https://www.gpsnetworking.com/products/aldcbs1x8)
>>
>> GPS Source S18 (https://www.gpssource.com/collections/gps-splitter/products/s18-1x8-standard-gps-splitter)
>>
>> The run from the antenna to the splitter will be 30-35 feet, and from the splitter to the units will be 3-5 feet. I’m wondering about the need for the 40dB vs the 26dB. I haven’t looked at any passive splitters, but even with the 40dB I’m thinking won’t offer enough to support even a 1x6 splitter.
>>
>> I would appreciate any thoughts folk have to offer.
>>
>> Thanks,
>> Denny
>>
>>
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