[time-nuts] Difference in GPS antennas

[Pete Lancashire]

I have some (well a LOT) of microwave absorber. it looks
like a mix of ferrite and rubber that has been bonded
to a stainless steel cloth (think window screening) in the
middle. About 1/8" thick.

I can get the make, p/n and a picture this weekend if interested.
I remember the company that made it got bought out, which then
got bought out etc and I gave up.

Price would be free+shipping, there are about 400 each
sheets about 30x30 inches. Each sheet must weight 5 lbs.


>
>
> On 8/14/09 9:13 AM, "Mark Sims" <holrum at hotmail.com> wrote:
>
>>
>
>>
>> Some of the data collection runs that I want to do is with the patch
>> mounted
>> on a pizza pan and in a cake pan and see if that helps the performance
>> by
>> faking what a survey antenna does.
>>
>
> If you can scrounge up some suitable RF absorbing material to put on the
> pan, that might be an interesting experiment.  Maybe even something like
> charcoal briquettes (I don't know if the resistivity is right..)
>
>
>
> I've tried the pizza pan thing, but that was because my antenna was a
> magmount, and it was convenient. I didn't see if it gave better
> performance.
> A flat plate might actually be worse than putting the bare antenna up on a
> pole, because it gives strong multipath from a very close reflection
> point.
>
>
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