[TowerTalk] D40 really works!
Mike & Coreen Smith
Sat, 8 Sep 2001 19:11:26 -0300
WOW, I'm blown away by this D40 and it's still light out here in NB yet!
(d-layer absorption IOW)
Upon closer inspection, it would seem my comparison antenna's (Delta Loop,
full wave) top is only at about the 45-48' level and the ground is also
about 5-10' lower than where my D40's tower is. This makes the delta-loop
roughly 15-20' "lower" than the D40 (perhaps not a fair comparison). Also
the lower part of my delta loop is only about 5' off the ground, buried in
Either way, the D40 @ 54' is always 10-20dB louder than the loop. DX and
local signals both.
So far I can't see any real, <what I would call 'deep'> nulls off the end of
the D40 however.
Perhaps the 4-5' distance it's away from the long 6m beam is upsetting its
pattern, or a close pair of BIG 6m beams on a
very nearby tower is messing it up a shade too.
Have not had time yet to run checks for the SWR/pattern curves on the
existing TH6DXX or 6m beam yet, with the
BTW, it beats my 17M inverted vee on the band by the same amount (10-20dB),
though my Vee is only at the 30' level ;-)
VE9AA , Mike
Michael, Coreen & Corey Smith
(VE9AA, VE9AAA & Baby-VE9)
271 Smith Rd
List Sponsored by AN Wireless: AN Wireless handles Rohn tower systems,
Trylon Titan towers, coax, hardline and more. Also check out our self
supporting towers up to 96 feet for under $1500!! http://www.anwireless.com
FAQ on WWW: http://www.contesting.com/FAQ/towertalk
Administrative requests: towertalk-REQUEST@contesting.com