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

Bob Camp kb8tq at n1k.org
Sun Oct 12 14:37:18 EDT 2014


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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