On Mon, 09 Apr 2007 12:37:52 -0400, Bill - N8ET wrote > Hi - > > I have to respond to this one even though my responsey does not have > much to do with PSKmail..... > > I sell the DK9SQ masts and products in the US. Several years ago > someone in the US claimed the mast was conductive and RF lossy. I > ran some tests and was unable to duplicate the claims. None of the > masts I have sold or tested have ever been conductive. They are > made of fiberglass, and are an insulator. I have tested with an ohm > meter and found no conductivity. Pieces have been put in a > microwave oven with no heating effects observed. I have run tests > on a 33' vertical wire with an antenna analyzer - first suspended > without the DK9SQ mast, and then moving the mast closer, and finally > wrapping the wire around the mast while looking for changes on the > analyzer at the base of the antenna. I had to wrap the wire around > the mast about 6 times before I noticed any change at all in the > impedance at the base. The change was very minor, and I attribute it > to the increasing inductance in the wire as it was wound around the mast. Hi Bill, Thanks for info. I have read on the web (http://www.io.com/~n5fc/dk9sq.html) that if you coil a ten meter piece of wire losely around the DK9SQ pole in order to make a 1/2 wavelength 20 meter vertical, then received signals drop a couple of S units, wherus if you tie the wire near the top and keep a distance of at least a foot near the bottom of the DK9SQ pole you see received signals go up. I have not done this myself but since you say that you have put pieces in a microwave and tested them I believe you but this guy on the web says that his signals dropped when he coiled his wire losely around the mast. I will surely make some tests myself using the DK9SQ as a vertical radiator and report back to this group soon. I use my DK9SQ as a support for a support for a one element QUAD and it is the best portable antenna I ever had. I also got another DK9SQ dipole last week to use it as a mast for a small VEE shaped telescopic dipole at about 7 meters from the bottom of the mast. It is a great mast and I always thought it is reinforced with graphite (it is 3 times stronger than a cheap fiberglass mast) hence it is slightly conductive. Not sure if the manufacturer claims no conductivity, but it is nevertheless a great and very lightweight antenna mast. I would personally recommend it to anyone!!! Have you ever used it as a vertical radiator yourself and is there a difference in received signals when you move your wire a bit further away? I always thought this to be true so I have never tried it myself, but as I said before this does not hinder the usefuleness of the mast since vertical radiators are a bit noisy and not very effective unless you know a few tricks or if you are next to the sea. Finally DK9SQ himself (see his web page http://www.qsl.net/dk9sq) does not even propose using his mast as a simple vertical radiator. His antennas are either the LOOP I have bought or dipoles. So to conclude the DK9SQ 10 meter antenna mast is a great mast and my comments were not meant as a bad advert or something. --- 73 de Demetre Valaris - SV1UY e-mail: sv1uy@xxxxxxxxxxx AX25 PBBS: SV1UY@xxxxxxxxxxxxxxxx http://sv1uy.ampr.org/~sv1uy http://www.athnet.ampr.org/~sv1uy