Yes, I saw your particular mention of survey antennas. My concern was that
multi-path will affect any setup.
I've seen pros and cons of placing a cookie sheets and pizza pans under
antennas to enhance "efficiency". I'm not exactly buying into this idea but I
thought your discussions were similar.
I have two identical antennas and one is already installed in a manner I
described. I suppose I could purchase a pole and mount it all by itself in
middle of my yard. Comparison will be very interesting.
Thanks for your reply.
---------------------------------------
(Mr.) Taka Kamiya
I'm stuck in a wormhole.... Hello, worms!
On Tuesday, April 30, 2019, 6:28:11 PM EDT, Bob kb8tq <[email protected]>
wrote:
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
> <[email protected]> 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 <[email protected]> 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
>> <[email protected]> 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: [email protected]
>> Twitter: @gm8arv
>>
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