On Fri, 11 Sep 2009, Mike Morris WA6ILQ wrote: > I've been thinking about setting one up, as a future project is to set > up a mobile, either a low band Syntor-X9000 or a Maratrac, with some > channels on Red Cross and the rest on amateur 6m. I may have to go to > a screwdriver antenna as a 1mhz wide window for 6m may not be > enough.... We currently have active 6m repeaters from 51.24 to 53.76 > Mhz. See <http://www.scrrba.org/BandPlans/51-54.pdf> > > And local Red Cross uses 43.00, 45.92, 47.42, 47.46, 47.50, 47.54, > 47.56, 47.58, 47.62, 47.66 and a few high band and UHF channels. > The 47 MHz channels will be no problem in a 1 mhz wide dual-whip > system, the 45.93 and 43.00 channel will be a problem.
You're going to be fighting the antenna bandwidth. One direction to head in would be the log periodic. Another would be a broadside array. > The radio isn't the problem it would have been when I still had > Motracs in a Ford station wagon with . It's going to be interesting to > make a low band mobile antenna work across all the channels. And then > to make a 99-channel MT1000 do it as well. Low band rubber ducks make > better blackjacks than antennas, but that's the only thing that isn't > fragile. It may take two separate rubber ducks - one for Red Cross, > one for 6m. Well, at five watts, are you even worried about a decent match? > Or a UHF handheld talking to/from UHF to low band mobile > crossband repeater. Not the most efficient way to use it. Then you're burning gas to support the VHF-Lo band comms. But if you can't get there with an HT, you don't have an option. -- Kris Kirby, KE4AHR Disinformation Analyst
