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September 29, 2007

J-Pole

I geeked out a little bit and got my Ham license last weekend. Ham radio is the "new" old internet and has been full of a steady stream of experimenters for nearly a hundred years.

My call number assignment came in Friday. For anybody wondering how long the total process took, I took the exam on September 22nd (a Saturday) and was assigned my call in the FCC database on September 28th (the following Friday) -- pretty fast for government paperwork! I am KE7OZN.

Naturally I wanted to build an antenna and try my hand at getting on the air. The only radio that I have is one that I purchased ~10 years ago, a HTX-202 from Radio Shack. My radio had a little problem that many of the 202's have after a few years -- the RAM battery was totally flat (0.08volts, and it is a 3v battery) and needed replacing. I did what WB3GCK did, and put a little CR2032 battery holder inside -- sure beats soldering a battery in place like RS did back in the day. So performing that little operation was my first order of business for the morning.

Cody-Antenna.jpg
Cody with a blowtorch, a menace to society

The placement worked like a charm. I went off to KC7FMM's house where we went through a few basic antennas and settled on a J-Pole. It's a handy antenna for 2m (144-148mhz) and tunes well to 70cm (420-450mhz). The design is quite simple, and requires only a few lengths of copper pipe and assorted joints and bends, and a feed line with connector on the end.

J-Pole.jpg
The finished product: my first antenna

The new antenna works well enough, even with the lossy feedline that Cody had in his spare parts box. I am able to hit the KB7ARA repeater well enough on 1.5 watts from Pullman. I need to get a SWR meter and some other fun gear to test it out with in a more thorough manner. I shall probably hold off on all of that until I get my 'real' radio, a nice little HF+UHF+VHF jobber that should let me bounce my waves around the world.

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