Jim I like the idea of a battery operated remote tuner and a simple relay change-over to provide a top-loaded vertical. I'm often bothered by connecting the antenna feeder into a 1:1 balun and then to the tuner. I've read that the very large impedance mis-match can lead to large losses in the balun on some frequencies, though you might not *feel* it with low power. With a self-powered little tuner, it would be easy to raise it off the ground a little and connect the ladder line feeder directly to the tuner; then coil some thin coax through a ferrite toroid to make a choke (see Jim Brown's excellent articles - K9YC) for connection to your RG213. This should also result in less noise pick up on receive. Some folks add a further choke at the shack end to further reduce received noise.
David G3UNA > I've been running my T1 remote out under my 88ft dipole which is just > short > of 50ft in the air at the midpoint. The ends are a bit higher. The T1 is > down at the ground under a plastic container and connected to the > windowline > via a Elecraft 1:1 balun. I remote control it via the circuit on my > website > www.jtmiller.com . I find it gets a 1:1 match on 80-6 meters. It is > connected to my K3 about 60ft away via RG213. > > Obviously the pattern is a bit of a daisy above 20M and is mostly a cloud > warmer at 80M and below. But that's just what this length dipole does > independent of match. > > I've lately been using the windowline as a vertical with the 88ft as a > capacity hat on 80-160 and found it works quite well. The T1 is very happy > matching that on 80M and gets to about 2:1 on 160. I use my K3 internal > tuner to remove the remaining mismatch on 160 to ensure proper power meter > readings. The loss due to this level of SWR on 160 with RG213 is > meaningless. > > When used in this vertical configuration the two ends of the windowline > are > tied together to one terminal of the tuner and the other side connects to > 8 > 60ft buried radials. > > 73 > > Jim ab3cv ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
