---Original Message-----
From: wb6rse1@mac.com
To: Top Band List List <Topband@contesting.com>
Cc: n9bx@mchsi.com
Sent: Thu, 26 Feb 2009 5:24 pm
Subject: Re: Topband: Flag antenna Gain:
On Feb 26, 2009, at 6:20 AM, n9bx@mchsi.com wrote:
Is this flag really playing like it should, or am I expecting too much
out of it?
____________
It is likely doing exactly what it should do since the back is on EU
from your QTH. Rather than thinking of it as a "gain" antenna, it
might be more useful to consider its directivity. You're trying to
minimize signals in other than the favored direction.
I have used several diamonds and a flag on my roof and can attest to
improved readably in the favored direction, and, unfortunately,
interaction with nearby resonant antennas. I use a single binocular
core to match to 50 ohm coax with a preamp at the rig. Compared to my
shunt fed tower and a coax RX loop, these large loops are very quiet.
The matching transformer is critical. It's the improved S/N that's the
difference here vs any "gain."
W2PM Replies
Negative 37 db is a very smalll output and off the back it's 20db worse
so I agree it's probably
working the way it should. I use several here, even 1/2 size models
with less output. They do need
a preamp on 160 although of very good nights running "barefoot" will
work. If you have too much
local crud noise a preamp won't help but if you have that type of
situation the Flag wont be
too effective either - depending on the level of the local crud noise.
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