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J POLE (1 reply and 1 comment)

Ross_mini
8 months ago
Ross_mini 8 months ago

I've built a J Pole antenna using with help from this web site https://m0ukd.com/calculators/slim-jim-and-j-pole-calculator/;

A friend of mine helped me tune it using his NANOvna. I was surprised how much difference 1mm made to the tuning! Once it was all worked out, cables soldered. We installed it on a bracket at the top of my workshop. Pogo plugged in my Baofeng in to it and bingo! He managed to communicate with some one a few miles up the road!

I soldered a PL259 female chassis connector directly to the one side of the copper tube and used a solid link wire to like the centre pin of the connector to the other side, using the NANAvna to make sure the it was connected in the optimum position. 

Will be looking to move the J-Pole onto the roof of the house, as its much higher up in the next few weeks or so.

Amazing what you can build using some scrap copper fittings and pipe.

Peter M0PWX (2E0PWX)
8 months ago

don't forget the baofengs tend to be dual band, so did you check the tune on both bands?

Ross_mini
8 months ago

That's a good point! only on 145Mz on the Nanovna. I got my mate check it on my cheap SWR meter. The power showed just shy of 7 watts, the reflected scale dial only moved a very small amount. but I'm sure the Nanovna would be more accurate. Will check before moving the J-Pole higher up on to the roof of the house.

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