[time-nuts] Choke Ring Pictures
bg at lysator.liu.se
bg at lysator.liu.se
Sun Mar 14 07:22:37 UTC 2010
Hi Brian!
Nice work!
/Björn
> Several years back we had the discussion about choke ring antennas.
>
> Dr Thomas Clark - retired NASA - Goddard Space Flight Center - I believe
> he was head of the VLBI project - made a simple choke ring antenna with
> an electrical junction box.
>
> I made 3 sets using pie plates. I promised somebody the pictures and
> forgot it until now. The pictures are hosted at
>
> http://kc0onr.com/Brian/_MG_0668.jpg
> http://kc0onr.com/Brian/_MG_0669.jpg
>
> I made these units because were I lived was surrounded by mountains 3/4
> around my property and I was at 720 feet elevation and the mountains
> varied from 1000 to 1200 feet. I had a problem that my receivers jumped
> positions several times and I suspected a multi path problem. I made
> the first antenna using some RF adsorbent material around the antenna.
> Helped. After making the choke rings, the problem went away. The other
> two units were used for carrier phase surveying. With the Motorola
> Oncore VPZ unit and Waypoint's GrafNav software I could get resolution
> down to a little under an inch.
>
> Brian KD4FM
>
>
>
>
>
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