[time-nuts] DIY Choke Ring Antennas?

[Robert Atkinson]

Be aware,
Googling "helibowl" at work may take you to websites selling glassware used for "recreational purpose"s that may not be appreciated by the IT police ;-)
 
Robert G8RPI.
 

________________________________
 From: Jim Lux <jimlux at earthlink.net>
To: time-nuts at febo.com 
Sent: Tuesday, 17 September 2013, 5:31
Subject: Re: [time-nuts] DIY Choke Ring Antennas?
  

On 9/16/13 6:51 PM, Bob Stewart wrote:
> With all the talk about choke rings, and having spent all my pennies elsewhere, I looked around to see if there were any do-it-yourself versions.  I found this one: "http://www.mauve.gr/var/DIY_Choke_Ring_GPS_Antenna.htm".  Is it worth the effort, other than as an experiment?  Are there any other homebrew versions out there that anyone has tried?  Granted, I have no real complaints about the amplified patch I have sitting on my HP stack which is right under a massive central air system, but it sounds like a project after my PLL is finished and my Rb standard is boxed up nicely.
>
The JPL'ers are fond of the Helibowl.. A helix wound on a plastic cup, 
mounted in a inexpensive mixing bowl, or those things you put under the 
elements/burner in a stove.  I've asked several times about specific 
dimensions and they're always sort of vague: I think it depends on the 
specific model of plastic cup and mixing bowl available at the local 
discount store when they make the antenna.

If you look up the dimensions of the choke rings, you'll see there's a 
fair amount of variability, so the "nested straight sided cake pan" is 
probably not a bad strategy, as well.





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