Al's Blog-o-Sphere

Today I finally got around to working on the 7 Band Portable Dipole I wrote about earlier. I had finished building it, but hadn’t tried it out or even seen if it works.

One thing that delayed me was my MFJ-259B antenna analyzer was in pieces. A couple years ago, I dropped it on the floor. It landed face-down and smashed the tuning knob. In the process, it bent the shaft of the tuning capacitor and made it stick and short out as it turned. I ordered a replacement from MFJ and installed it, but it still had problems. It acted flakey. It turned out, although it looked fine upon inspection, the range switch was also damaged and was working intermittently. It sat on the shelf for a couple of years while I decided what to do with it. The antenna project made up my mind to look at it again.

I was dreading tearing into a multi-position rotary switch. I had visions of parts and wires hanging off every terminal. Fortunately, it was a PC-mount switch and every connection went through the PC board. If I could only get it off the PC board without destroying anything, I could replace it. So I carefully disassembled the ‘259 far enough to access the back of the switch. With some care to carefully desolder each pin and a little wiggling, the switch came out. I ordered one from MFJ, along with some of the plastic parts to the push buttons that had also flown off and been lost in the fall. Continue Reading…

Warning: Ham Radio-related content. If that bores you, better steer clear of this post.

I don’t know what inspired me to do it, but I have undertaken the construction of a portable antenna for my Ham Radio operations. Probably just for something to do, or curiosity to see if such a small antenna can really be effective.

I usually use some method of shooting a wire up into tall trees for this type of operation, camping or just operating “Field Style” for fun. I’ve been pretty happy with the fishing-reel-on-a-slingshot method and I built a Pneumatic Launcher that can be very effective at putting a line over even the tallest of trees. I’ve also acquired some telescopic fiberglass masts (fishing poles) that work quite well as supports for vertical wires. But this design caught my eye and I decided to try it and see.

The idea come from a web page that I saw mentioned on the QRP-L email list: VE3GAM. There are commercially-made antennas that are similar, but this looked easy to make. It might be fun to try.

The idea consists of a shortened dipole on a portable mast and tripod that can be disassembled when not in use. The central portion of the antenna is built using a plastic electrical box and some aluminum tubing. Loading coils are made out of plastic PVC conduit and tapped for the various bands. Further tuning from band-to-band is done by varying the length of the ends of the dipole, which are made out of long telescopic whip antennas. Think of rabbit ears or a transistor radio antenna, but longer. Continue Reading…

From Drop Box

For the second weekend in a row, I took off on the bike for a overnight trip. This time I rode to the Rochester Hamfest in Greece NY, a trip I usually make by car. I go every year and it’s a chance to socialize with fellow Ham Radio operators I often don’t see much any other time. I talked to more Hams I know from Lockport than I see around town.

I belong to one Rochester area Ham club, the Rochester DX Association, and I enjoy meeting and hanging out with them. They always set up a big area at the hamfest for that purpose. You can sell things there, if you don’t have enough to justify setting up your own table. Or just talk.

I rode out on Friday, planning on arriving in the evening and camping overnight. I knew I would need to stay over Saturday night as well, so I asked ahead to see if I could stay the second nigh and got permission.

The trip out was long, but uneventful. I rode the Canalway Trail from Lockport to Medina, then jogged north to Route 31 aka, NY Bicycle Route 5, and took that to Albion. Riding the road was much faster and it was hot and sunny. I was glad to find places to stop and buy something to drink. I pulled into the Super Wal-Mart just outside Albion and bought a lemonade, Vitiamin Water and a candy bar, mostly for a break and a chance to get out of the sun. When I left, I stopped again in the Village of Albion at McDonalds and had one of those Lemon-Strawberry Slushies. I got brain-freeze, but felt much cooled off. Continue Reading…

Well, I almost decided to ride my Trike to the Dayton Hamvention. I had the route all figured out and plotted to take about 60-70 miles each day. It would have taken a full week to get there. The plan would have been to leave Thursday the 12th and arrive at a hotel on Wednesday the 18th of May. I found a room less than 3 miles from the Hara Arena for a very reasonable price.

I though about a room at the QRP-ARCI Four Days In May conference, but that was a fair distance away from the Hamvention. There was a shuttle bus to and from the Hamfest, but I kind of wanted to ride there and partake of some of the BMHA (Bicycle Mobile Hams) events. Plus, the FDIM rooms were nearly twice as much per day as the one I found to the north. Continue Reading…