[time-nuts] Rooftop antenna and splitter

[Bob kb8tq]

Hi

The pictures shown earlier are of a “survey antenna”. In the post I was careful to refer to a “survey antenna”
as the point of the post. Ideally you want to be meters away from any metal.

Bob

> On Apr 30, 2019, at 5:42 PM, Taka Kamiya via time-nuts <time-nuts at lists.febo.com> wrote:
> 
> I can see that on survey situation but will it affect timing installations?
> Will you give me an idea how far those bullet type antenna needs to be?  My antenna sits on a very short pole (2 feet?) and its base is mounted to frame of my screened in porch.  Roof and structure is aluminum, which is very much like ground plane and reflective.
> 
> --------------------------------------- 
> (Mr.) Taka Kamiya
> I'm stuck in a wormhole....  Hello, worms! 
> 
>   On Tuesday, April 30, 2019, 5:01:05 PM EDT, Bob kb8tq <kb8tq at n1k.org> wrote:  
> 
> Hi
> 
> You very much do *not* want to put a ground plane on one of the modern survey
> antennas.(Chinese or US or Canadian or …)  The better ones are very explicit 
> about this. They are optimized to sit on a pole in free air. Anything else and the 
> pattern is degraded. ( = multipath gets worse)
> 
> Bob
> 
>> On Apr 30, 2019, at 2:23 PM, David J Taylor via time-nuts <time-nuts at lists.febo.com> wrote:
>> 
>> Hi David,
>> 
>> No, no ground plane. Don’t really have a lot of room for that in the window. Out of curiosity, how large of an impact have you found with a ground plane?
>> 
>> Btw, I love the pan!
>> 
>> Denny
>> ============================
>> 
>> Yes, Denny, choosing the baking tray (IIRC) was fun - I wanted as large a flat area as I could reasonably get, but it has to be magnetic.  I don't recall what I took into the shop to test with!
>> 
>> Unfortunately I didn't make any specific measurements with and without the ground plane, but I did see a noticeable increase in SNR.  Even a small e.g. tobacco tin may help.
>> 
>> Cheers,
>> David
>> -- 
>> SatSignal Software - Quality software for you
>> Web: http://www.satsignal.eu
>> Email: david-taylor at blueyonder.co.uk
>> Twitter: @gm8arv 
>> 
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> 
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