Showing posts with label Antennas. Show all posts
Showing posts with label Antennas. Show all posts

Tuesday, November 4, 2008

HAMing it up again.

Over the last several weeks I've been putting together my "Go-Kit" for call-outs in times of distress and disaster. It involves having a couple of radios that can operate on battery power when necessary, extra radio goodies like connections, wire, tools, and antennas. One of the problems for going mobile or at a temporary site is having an antenna to hook to the radio. Most use some variety of magnetic mount antenna. That just applies to the roof, or trunk, or hood of a car or truck. It also can be taken indoors and put on the top of a metal file cabinet, or other metal box like an refrigerator.

It's also good to have an antenna mounted to the vehicle for both moving and stationary use. This can be the mag mount or one attached to the vehicle in an alternative way. I have both. The mag mount will be available for some inside work and while in motion. The other antenna is for stationary use on the vehicle. I've rigged an plastic tube on the tire rack of my Jeep. I can stick a "push-up" painter's pole into the tube to hold it upright. The push-up pole will extend to 12 feet. In the tube the pole tops about 16-17 feet. This will sometimes be necessary if I get in a low lying area. It helps to get the signal on a more "line-of-sight" to the other antenna/radio, where ever it may be.

I've put this together from a mobile antenna that I already had, bought an adapter to attach it to the pole, and of course I had to buy the pole and plastic tube, so I've got minimum dollars spent to get it ready. On 11-16, I'll be working a marathon at a check point. It will be a chance to see how well both antennas work.

As part of getting the go-kit ready, I had to program several frequencies into the radio. Now, I have a book describing the process and it is involved. The easier way is to get a computer program and adapter cable and put all the necessary frequencies into the program and then load it into the radio. This is what I've done. However, if I go out of my local area I'll have to put in other frequencies. For that I 'll take the book of instructions and do it manually.

Next comes next comes a personal go-kit. Clothes will be loaded at the time of need. Some items can be set up before hand. Rain gear, bug repellent, flashlights, food, water, sleeping equipment, all can be put together over a period of time. Most of this stuff is non-perishable, but the food will take some thought. MREs are available, as is sportsman's freeze dried food packets. Caned food is OK, and other stuff will be chosen for long shelf life and compactness. I'm not worried about hot food, I eat out of cans at home without benefit of heat anyway. I do have a single burner propane stove for heating water for instant coffee.

So, I've still got things to put together, but I got a little time. Baring some emergency out of the blue, it will be next spring before hurricane season when the need for go-kit becomes critical.

Monday, August 4, 2008

On the Air

Well, I spent the better part of two days sorting out and setting up the radio station. I tried to follow plans and suggestions found in the ARRL Handbook. It shows how a station should be set up for best performance. As much as possible, I followed it and then sat back to admire. It doesn't look all that impressive - as compared to some Hams. Once it was all hooked up and everything in place it was time to give it a try. The evening and into the night of the second day I listened and hunted for someone to converse with. There are several "nets" found on the lower frequencies. and I listened to them carefully. One operating here in Texas was sounding strong, so I tried to jump in. Now, the jump in is usually welcomed if one follows custom and manners in doing it. One announces ones self by giving the call sign (in my case its KD5MSW) and waiting to be invited in. I made several calls with no response. I tried a couple more time and then two different Hams said they could hear someone trying, but the signal was not strong enough for them to get a good "copy." I was a little discouraged, but decided I needed to work on the antenna to get it "up to snuff." The next day I went out in the heat of the day and added additional wires and cleaned all the connections. That evening I listened again. The background level of noise from thunderstorms halfway around the world, electrical devices in my house and in the neighborhood and other stations a long way away almost covered the same group from the night before. Still, I listened and tried to jump in. No one heard me. I guess my little vertical antenna, ground mounted, was not putting out enough. I was supposed to be transmitting with the maximum power the radio is capable of, but maybe it wasn't getting all the way into the "ether's." Maybe what I was doing was "heating up the atmosphere." That means all I was doing was putting radio waves into the surrounding to no avail.

What I need at this point is for some knowledgeable and experienced Ham to come over with some test instruments and check out the antenna and radio. Make sure the radio is putting out, make sure the antenna cabling is not damaged and is passing the electrical energy, check to see if the antenna is defective and shorted in some way. Maybe it just my location. There are places on earth where radio signals seem to get lost. Sounds mysterious, but its really a case of local ore deposits, level above ground, surrounding buildings, and a lot of other variables. Maybe I'm just in one of those places. I hope not. If that's the case, I'll have to set up as a mobile operation. Not necessarily in a car, but able to take my station to the top of a hill, or open flat area away fro buildings and electrical noise. I'll up date at some time in the future on how it turns out. C U later

._._.

Sunday, June 29, 2008

Folow-up on Field Day

Well, it's over. Another Field Day done and put away. The setup takes as much as a whole day before start to get things into place. There are radio positions to determin and folding tables or picnic tables to locate and place. There the antennas to be strung between trees or poles, or where ever the ends of two wires can be attached. Then there is the power sources, usually portable generators, but sometimes batteries or solar panels. Generators need to be placed at a distance for safety and noise interference. Batteries and solar goes close to the radios. And then there's the food and cold drinks. Usually a BBQ is made up with pot-luck dishes brought, cakes and cookies and pies magically show up. Cold drinks - water and a variety of soft drinks - are iced down and set aside in large "Igloo" type coolers. A lot goes into this event. Yes, it's supposed to simulate an emergency, but since it's not, there's no need to be completely primitive.

At the end today, the take apart goes much faster. Most all of the food is gone, a few bottles of water are left, litter is picked up and disposed of, and all that's left is to take down antennas and disconnect radios. It goes much quicker than the set up.

One of the side benefits of participating in Field Day is the earning of points based on how many contacts are made. There is a weighted system of point earnings based on number of persons running a location, number of contacts per frequency used, distance of contact, and a couple of other ways to earn points. What does all this point earning get an individual or club. Nothing tangible, but bragging rights mean a lot to many of the participants. Being able to claim most points is a badge of honor. It lasts until next year, then everyone involved starts over.

However, some of the "Big Guns" always manage to get into the top rankings year after year. "Big Guns" are individuals or clubs who have extensive antennas, high power signal boosters, expensive radios, and a "go-for-the-throat" kind of attitude in making contacts. Some folks stay awake the whole time so they can stay on the radio. They eat sandwiches at the radio, take minimum potty breaks, and drink a lot of coffee. The two clubs I belong to are not Big Guns and have a relaxed attitude toward points. If they get points, fine. If not, oh-well, everyone had fun, and maybe learned something or polished their skills under less than perfect conditions.

So now we anticipate and plan for next year. We look over what went wrong and maybe how to prevent it next year. After all, this is a practice drill for a real emergency and things go wrong and ways to work around them are better found when it's not an emergency.

Well, I managed to stay out until about 01:00CDT. Late for me, but I got to both club locations and engage in a pleasant social intercourse with my fellow Hams. ._._.