I used the upper end of the band for the designed area of operating and have a 2:1 SWR from 3.810-3.980
I used Belden 8267 for the coaxial section and the remaining portion of the antenna is made from the 10ga wire that my old dipole was made from.
To connect the wire to the coax, I cut about 3inches longer than needed. I stripped the outer jacket and folded the braid back over the coax then I stripped the inner insulation off. Next, I wrapped the inner conductor and wire end together and soldered. Then I folded the braid back over that joint, twisted it, and soldered it onto the previous joint.
Time will tell if this is a mechanically sound antenna. I was a bit surprised by the narrower bandwidth. The bazooka I built with RG-6 for 40m covers the entire band, but the entire length of it is RG-6 coax.
I have epoxy potted the center with 5 minute epoxy. This helps to hold the coax in the conduit body and seals it from the elements.
The bandwidth is narrower than my 40m bazooka, which is to be expected. It is the same for any antenna, as the frequency lowers the bandwidth gets narrow. It is somewhat a function of length to diameter ratio.
Sunday, August 15, 2010
Friday, August 13, 2010
Wednesday, August 11, 2010
I was mowing the other day and caught the guy line holding the outer post of my dipole setup. The antennas started to whip and one of the 160m legs broke at the insulator. I have cut the 160m section from the center insulator and now only have a 75m dipole. I think I will build a 75m bazooka and replace the setup with that.
Posted by David at 11:21 AM