In a message dated 10/29/06 11:12:34 AM Eastern Standard Time, [EMAIL PROTECTED] writes:
> [EMAIL PROTECTED] wrote: > > In a message dated 10/27/06 4:38:23 PM Eastern Daylight Time, > > [EMAIL PROTECTED] writes: > > > > > >> The Diamond bottom tube may, (and likely) contains a broad band ferrite > >> cable choke. > > > > Probably - to keep RF off the outside of the coax. Such a choke would cost > a > > few dollars at most. > > Actually, a choke on the coax would *prevent* the antenna from working > unless it was mounted on a metal mast. It needs a counterpoise and the > coax shield provides it unless a mast or radials are present. Agreed. Note that in the literature, the unit is shown on a metal mast. > > This is actually similar to the 'e-h' antenna, in which the alleged > 'antenna' at the end of the feedline serves to tune the shield of the > feedline to resonance. The shield actually does the radiating. Adding > a bead balun to an e-h antenna causes the antenna to stop working and > the balun to get hot! No, I don't want to start a thread on this > antenna either! > Good idea. > In the Diamond antenna, the feedline is only half of the antenna, with > the 22-foot radiator being the other half and the resistor smoothing out > the SWR variations. > Or the mast. So what's probably in the "matcher" is really just a resistor. $400 for 22 feet of tubing, a mast clamp, and a nice noninductive resistor. 73 de Jim, N2EY _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
