View Single Post
  #31   Report Post  
Old July 18th 08, 04:33 AM posted to alt.tv.tech.hdtv,rec.radio.amateur.antenna
J. Mc Laughlin J. Mc Laughlin is offline
external usenet poster
 
First recorded activity by RadioBanter: Jul 2006
Posts: 172
Default True Outdoor HDTV yagi's

Dear "me" Not big at all. It is intended for high VHF and UHF. I have
it mounted on a tube that is supported in turn by the top section of a
tower, which became surplus after a rotator change. The whole assembly is
in a second story room with the main computer and can be rotated by hand.

It is deceptive to put numbers on the size. The reflector consists of five
doublets each with a tip-to-top length of 26.5 inches and a total height of
a little over 16 inches. The twin "driven" elements are spaced about 6.6
inches in front of the reflectors (obviously the reflectors are only
effective for UHF). The tip-to-tip length of the driven elements is about
34.5 inches (giving a predicted 0.5 WL resonance towards the bottom of the
higher VHF TV band). Each driven element is coaxial with a fan dipole that
should have a resonance somewhere in the UHF band. Thus one expects a small
gain with a small F/B in the higher VHF band and fair gain with good F/B in
the UHF band.

I hope that this is of some assistance. I regret that you believe you must
be anonymous.

Regards, Mac N8TT

--
J. McLaughlin; Michigan, USA
Home:
wrote in message
...
"J. Mc Laughlin" wrote:

I have been using a Winegard HD-1080


How big is it? Compact?