[Antennaware] Flag antenna noise
w5xz at att.net
Sat May 12 17:17:14 PDT 2012
my reply, after working for almost a year to get a pair of them playing, nearly 180 out in rotary configuration. a.k.a. "the waller flag" is...
'it depends...' mostly, on how big it is...and if you intend to combine more than one... and ( very much ) how far apart they are...large ones, of course, being difficult to rotate
a single flag has impressive f/b, but mediocre RDF due to poor side rejection, IMHO my experience has been that a pre-amp at the feedpoint, if balanced input, and hi Z is well worth the trouble...as is a rotary configuration.
best of luck.....73, w5xz, dan
--- On Sat, 5/12/12, Andy Ikin <andrew.ikin at btopenworld.com> wrote:
From: Andy Ikin <andrew.ikin at btopenworld.com>
Subject: [Antennaware] Flag antenna noise
To: antennaware at contesting.com
Date: Saturday, May 12, 2012, 11:12 PM
Would I be correct that a Flag antenna with a 1k Ohm termination resistor would have a approx. -126dBm noise in a 1kHz bandwidth, excluding other noise? This equating to an 18dB Noise Figure ? Hence, one wouldn't notice any difference in s/n when comparing Head Amplifiers of similar gain with a 1 or 4 dB noise figure? Or have I got something wrong!!!!!
Andrew Ikin G8LUG
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