Bicycle Mobile

For the past 7 months, I have been walking to improve my health. Recently, I bought a bike to change up the routine a little. I think it would be fun to ride while I am camping and the times when I am not at the highest point in the park, I could ride my bike there. When I bought the bike I had them put on a rack. This left a very nice mounting tab for the antennas.

I had some angle aluminum from a prior project so that is where I started. I cut the aluminum to match the width of the rack and then started shaping it. I only had hand tools and there was a lot of filing involved.

The hole on the left is for a SO-239 mount and the one on the right is for a 3/8-24 bolt. The SO-239 is attached to some thin coax probably RG-174 and terminated in a female SMA connector. Perfect for an HT. To get the wide radius I cut in the metal with a Dremel tool.

This is where the hand filing came in. After the filing came sanding the old finish off and applying coats of primer, flat black paint, and a clear coat. Installed on the bike it looks like this with a Diamond NR-770HA dual band antenna.

Out by me, the repeaters are VHF, I tuned it for that band. I ended up with this.

With an HT on the other end, I was able to hit repeaters 10 miles away while under my carport. I called it good.

I also wanted to work HF using my bike as a stand. I won’t ride with the HF antenna installed but rather set it up when I stop. I mounted a 3/8-24 coupler to the antenna mount and wanted to use my Buddipole 12′ fiberglass antenna. I tried several different combinations and the one that worked best was using my Chameleon Micro Hybrid transformer with one counterpoise.

SWR on 6 meters through 40 was acceptable and can easily be handled by a tuner.

I didn’t try HF on the bike but I have used the configuration before. It’s part of my Frankentenna system. The only thing left I have to add is a handi-talkie mount which I will probably order today.

There you have it. A fun little project that will add to the adventure of ham radio. I hope this may spur some of you to try a few projects of your own. Most of these projects I do are with hand tools. I do have a cheap drill press that only seems to be a little better than a hand drill. Get out there and do it. 73 — Scott

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