Walt, a dipole at 1/2 wavelength is not omnidirectional, so I'd go for something else. It depends on the coverage you want. Probably an inverted vee with the apex at 1/4 to 1/2 wavelength would be a good compromise. I use that at PI4TUE, and it is being worked from all directions, one of them being North, my 2000 km link from Spain. But I can also see pings answered from Ukraine, which is due East. For NVIS I think 30m is on the high end, the MUF is around 10 MHz for only a few hours a day. I think you will use 80m a lot for NVIS. On the camper I use something like an end fed inverted vee for 30, 40 and 80. It consists of an 8m fishing rod with wire coiuled on it and pulled forward with a 4m piece of wire. I can work the Stockholm server easily with 25 Watts with that. 73, Rein EA/PA0R/P > -----Ursprüngliche Nachricht----- > Von: pskmail@xxxxxxxxxxxxx > Gesendet: 03.03.07 21:01:04 > An: martin <pa3dsc@xxxxxxxxx> > CC: pskmail@xxxxxxxxxxxxx, morse@xxxxxxxxxxxxxxxxxxxxxxx > Betreff: [pskmail] Re: [morse] Re: PI4TUE down next weekend > > Well I dont' have a space restriction and need an omni-directional antenna. > > I really don't know if I want a NVIS pattern or low angle pattern. In either > case, I want an omni-directional pattern. > > I had thought about a turnstile antenna with 1/2 wavelength elements fed at > 1/2 > to 5/8 wavelength above ground so it would be omni-directional and would have > a > moderately low angle of radiation. > > I could put the antenna up at 50 ft on my tower and put one 1/4 wavelength > element of the antenna off of each leg of the tower and fed with RG-11 coax > with > a 75 ohm to 50 ohm balun type transformer before going to the transmitter. > > The transmitter would probably be a QRP transceiver running into a 100 watt > linear the power output would be about 60-80 watts PEP. > > Walt/K5YFW > > martin wrote: > > My opinion the best for single band operation is a magnetic loop. > > > > martin pa3dsc > > > > > > > >>>The PI4TUE pskmail server will take a weekend off on the 3rd and 4th of > >>>March. > >>> > >>>Reason is that the contest crew of PI4TUE will try to win the ARRL DX > >>>SSB contest. > >>>They produce 1.5 kW and the 40 meters dipole is about parallel to the > >>>30m dipole of the server, > >>>so the server will get a break. > >>> > >>>The server will be back 5th of March 00.00 UTC > >>> > >>>73, > >>> > >>>Rein EA/PA0R/P > >>> > >> > >>Holy RF overeload Batman!!!! > >> > >>A questions...which do you think is better for a 30M PSKMail server...a > >>1/2 > >>wavelength dipole at 1/2 wavelength of more AGL, a 1/2 wavelength dipole a > >>less > >>than 1/2 wavelength AGL, or a vertical at 1/2 wavelength AGL? > >> > >>73, > >> > >>Walt/K5YFW > >>---------------------------------------------------------------------------- > >>Stuur subscribe/unsubscribe verzoeken naar > >>majordomo@xxxxxxxxxxxxxxxxxxxxxxx > >> > > > > > > > > > > > > > -- http://pa0r.blogspirit.com