[time-nuts] Advice on sighting a roof mounted gps area please

[Bob Camp]

Hi

If you are going to get any benefit from multiple antennas, you want to space them as far apart as possible. You are better off with one antenna and a splitter than with two close spaced antennas. 

The cost of mucking around on the roof is non-trivial. The world is headed to L1/L2 operation on GPS and similar systems. Invest the money in one good antenna and mount rather than multiples. 

Bob

On Oct 12, 2014, at 10:19 AM, paul swed <paulswedb at gmail.com> wrote:

> Tim
> The antennas should not interfere with each other due to rf leakage because
> of the way the systems are designed. I will believe you are using 2 rf
> feeds.
> The more you can clear the trees the better. My very simple solution is a
> 90' tower.
> A bit of humor it does have other uses.
> Regards
> Paul
> WB8TSL
> 
> On Sun, Oct 12, 2014 at 7:34 AM, swingbyte <swingbyte at exemail.com.au> wrote:
> 
>> Hi All,
>> I am building a house extension and part of the works involves adding a
>> new hip roof made of corrugated iron.  I was thinking I would pass a 50mm
>> pvc pipe through the roof with a tee and then mount two conical gps timing
>> antennas on top of it.  I am in a low point and don't have visibility of
>> the horizons ( I'm not in the out-back).
>> My question is should I mount on the peak of the roof?  How close can I
>> mount two antennas from each other? Can they interfere with each other?  I
>> am also in the midst of some tall trees - although my new roof will be
>> pretty high it will still be below the tallest trees.
>> Of course the main reason for this is I want to do some accurate timing
>> 
>> ASCII art of proposed set-up
>> 
>>  A                  A
>>  |                  |
>>  --------------------
>>           |
>>           |
>>           ^
>>          /  \
>>         /    \
>>        / roof \
>> 
>> Thanks for your advice
>> 
>> Tim
>> 
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