A New Random-Wire Antenna and First 80m Contact

Sometimes the simplest of radio work pay the biggest dividends. Last week, after a few weeks of hemming and hawing about it, I finally committed to putting up a longer wire antenna that allowed the possibility of using multiple bands. The 40m dipole I put up at the end of August has proved to be fine as a receiving antenna, but it suffers two key limitations. First, it’s obviously a single-band antenna (though I may try it on 15m as well). And second, situated as it is between two apartment buildings, I think I’m wasting most of my energy heating up the bricks rather than propogating energy out into the world. It’s also only ~10′ off the ground.

The new antenna helps with all of these issues. It’s simply a ~58′ piece of 22-gauge speaker wire strung from the office window out to a tree that sits in the apartment’s back yard.at its highest, the wire is maybe 20 feet up. While it’s a little visible in the alley if you’re looking for it, it blends in with the surrounding tan brick enough that I don’t think it’ll be noticed. I dropped a ~16′ piece of the same wire out the window to act as a counterpoise.


No, I swear, there’s an antenna running right through the center of this picture.

Like any random-wire, this one needs a tuner to be useful. I first tried using the ZM-2 tuner I got last Christmas. I sadly think I have a short in one of the variable caps in that tuner, which makes it non-functional for now. The MFJ-949e tuner did the trick though – I attached the long wire directly to the “WIRE” banana jack on the back, and the counterpoise to the grounding lug. The antenna tunes up better than 1.2:1 on 80m, 40m, 30m, 20m, and 15m. Which doesn’t necessarily mean it’s an efficient antenna, just that it won’t unduly stress my transmitters.

When I tuned the antenna the first time, I made myself a cheat sheet of the capacitor and inductor settings that gave me the lowest SWR on each band. I then taped this cheat sheet to the top of the tuner. This gives me a place to start when I need to retune for a particular band.


The same evening that I put the antenna up, I did a tune-through of the CW portions of 15m, 20m, 30m, and 80m. It’s really the first time I’ve been able to hear anything on a band beside 40m, so I figured a little exploration was due. I came across an S7 signal at 3.545 MHz calling CQ, and just for grins, I gave him a call. And he came back to me! Arthur, N8ART in Columbus Ohio, running an older rig into a dipole, if my copy was right. 

Columbus is a little under 300m from my QTH in Chicago, so this was probably a single-hop contact, or really NVIS. But it represents my first contact outside of 40m, which is terribly exiting! The new antenna is already proving its worth.

This was also my first contact with a new transceiver, an ATS-4 which I snagged as a “tech-special” (i.e. broken) from qth.com and repaired. That process deserves its own write-up. I’m also using a second-hand Ham Key I picked up at Radio Expo 2016 in Belvidiere, an event that also deserves its own post. But really, I’m just too excited about the contact on a new band to try to keep these posts strictly sequential.


Hear you on the air, maybe on 80m!

73

 

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