[time-nuts] Choke Ring Antenna - Patch Placement?

Don Latham djl at montana.com
Thu Oct 10 23:52:22 UTC 2013


Here's one solution:
http://www.novatel.com/assets/Documents/Manuals/gi-00110033.pdf
Bob Stewart
> Hi Bob,
>
> Thanks Bob.  It's hard to say whether or not it attenuates at the lower
> elevations, but it does add gain to the higher ones.  Well, at least I
> have some idea what I'm shooting for.
>
> Bob
>
>
>
>
>
>>________________________________
>> From: Bob Camp <lists at rtty.us>
>>To: Discussion of precise time and frequency measurement
>> <time-nuts at febo.com>
>>Sent: Thursday, October 10, 2013 4:41 PM
>>Subject: Re: [time-nuts] Choke Ring Antenna - Patch Placement?
>>
>>
>>Hi
>>
>>You are looking for total rejection of any signal below the horizon,
>> and near total rejection of any signal within 10 degrees of the
>> horizon. Obviously total and near total could have db numbers
>> associated with them, but the numbers you get are what ever you get….
>>
>>Bob
>>
>>On Oct 10, 2013, at 2:15 PM, Bob Stewart <bob at evoria.net> wrote:
>>
>>> I bought a set of Wilton "tuned" pie pans yesterday to experiment
>>> with a choke ring antenna.  The "kit" consists of 4 pans of
>>> diameters 12", 10", 8", and 6".  The height of the sides is more or
>>> less 51mm.  I've been experimenting with placement of the patch in
>>> the pit, but I don't know what I'm looking for, so a little help
>>> would be appreciated.  Am I looking for best overall signal level
>>> from horizon to azimuth, or something else?  I'm not sure I would
>>> know how to measure multi-path levels.  There seems to be a definite
>>> difference depending on whether the patch is at the bottom, somewhere
>>> in the middle, level with the rim of the pans, or even perched on a
>>> DVD disk which is level with the rim.  I don't have any sort of
>>> metal container to use as a support for the patch at this point.
>>>
>>> Bob - AE6RV
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>>
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-- 
“The power of accurate observation is commonly called cynicism by those
who have not got it.”
-George Bernard Shaw



Dr. Don Latham AJ7LL
Six Mile Systems LLC
17850 Six Mile Road
POB 134
Huson, MT, 59846
VOX 406-626-4304
Skype: buffler2
www.lightningforensics.com
www.sixmilesystems.com





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