[time-nuts] Pizza anyone?

[Don Latham]

Hi all: for the proper dimensions, see some of the sections of W1GHZ's
microwave antenna handbook to get the appropriate size for the pizza pan
choke. Mark may have gotten lucky...
Don

Magnus Danielson
> Mark,
>
> I'll take salami, onion and mozzarella...
>
> Mark Sims wrote:
>> I bought a couple of pizza pans for the GPS Patch Antenna Improvement
>> Program...  preliminary results:
>>
>> My  15+ year old Magellan patch antenna (actually made by Murata) would
>> barely function with the Tbolt.   It was (barely) tracking three
>> satellites and going through long periods of holdover.  I then mounted
>> it on the bottom of a 16" pizza pan.  It is now tracking 8 satellites
>> with no signal dropouts.
>>   If you are using a consumer/automotive type patch antenna,  you might
>> want to try a pizza pan ground plane under it.   I am doing a 48 hour
>> survey run to see how it performs compared to my other antennas.  I
>> cannot compare it to itself without the pan since it would never
>> complete the survey.
>>
>> My geodetic grade antenna is a patch type antenna mounted on a 14.5"
>> aluminum disk.  14" diameter is a standard pizza pan size.  I am going
>> to try mounting the TAPR Motorola patch to it and see what happens.  I
>> have a good 48 survey with that antenna to compare to.
>
> I have been thinking that maybe keeping the edge/ridge upwards may be a
> bad thing, so maybe flipp it over and see what ridge downards is better?
>
> Just for comparision. I'm curious.
>
> Cheers,
> Magnus
>
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-- 
Dr. Don Latham AJ7LL
Six Mile Systems LLP
17850 Six Mile Road
POB 134
Huson, MT, 59846
VOX 406-626-4304
www.lightningforensics.com
www.sixmilesystems.com