Duh: Learning Curve #3–Coke Choke Works!

Had a great time setting up the C Pole antenna in a tree suspended configuration. My good friend and cohort, Jim Diggs, K4AHO came by with his AIM 4170 Antenna Analyzer and we were ready to tune the antenna and get a feel for it.

LESSON: A good analyzer makes tuning an antenna fast, simple  and accurate! The AIM 4170 gave us a TON of info (most of it going over my head) and let us see how the C Pole was doing in several areas.  Take a look at this output! (Click on the image for a larger version)

C Pole Plot
K4UPG C Pole Scan Results

LESSON: I followed Niel’s directions, but did not have a small plastic coffee container so used a Quart Coke bottle instead. So I call it a Coke Choke and it seems to work well. Here’s a photo to show it off!

Coke Choke
Coke Choke Ready for Duty

I think this one is a keeper. Goes up easily, hears well and loads nicely too. I made a few brief contacts and called it a day, but look forward to more C Pole action in the days ahead.


Kelly K4UPG PB #173

p.s. Don’t forget to vote in the Ideal Ham Radio QTH poll on the blog!


  1. Alex says

    Coke choke is a good thing, Kelly. I have had one attached to my 43ft HB vertical in the backyard for the past 3 years. My “coke choke” is filled with kitty litter to prevent collapsing and then wound with RG213, 12 or 13 turns and wrapped Well with electrical tape. More than likely duct tape would have been just as good a wrap but in my feeblemindedness I didn’t think of it!!!
    The graphs look good, nice RL and the absolutely beautifull Bucket Curve for SWR; flat swr over an entire band is not a good thing as you know. Interesting to hear more about the Kelly C-pole contacts.
    Buy me a AIM 4170 for Christmas please!!!
    73 Alex K5uny

  2. kmack says

    Good to connect! Was thinking of you… because of your email, I got the 44 ft doublet out and tried again. This time with the center on 20 ft Jackite pole and the two ends on 16.5 ft Crappie poles, it loaded up very nicely on both 40m and 20m. Eureka! Nice and easy to get up and down. It is made of 50ft of twinlead split for 22 ft and the rest for feedline. Sweeeeeet. Glad you cajoled me into giving it another go. CU on the air this weekend???
    Kelly K4UPG PB #173

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