Stan,
Without crunching through the numbers, it seems obvious that you will have
to have a significant signal loss to overcome due to the low antenna gain at
the input of a preamp.
With -79 dB of gain from a Waller Flag, the input to your preamp will be
far below -174 dBm. If it were even possible, the input noise to your
preamp would be less than -185 dBm.
Jim - KR9U
-----Original Message-----
From: Topband [mailto:topband-bounces@contesting.com] On Behalf Of Stan
Stockton
Sent: Saturday, December 15, 2018 2:15 PM
To: topband@contesting.com
Subject: Topband: Waller Flag
I am curious to know if anyone on here has scaled a Waller Flag to a
smaller antenna and had any success with whatever might be available for
preamps to bring the gain up enough to start to hear band noise.
At my location on Cayman Brac I could probably get by with a 20 foot boom
but not much larger. According to my model, one with a 50 foot boom is
about -48 dB, one with a 30 foot boom is about -65 dB and one with a 20
foot boom, like I would lilke to put up, is about -79 dB.
I guess a lot to do with how successful the antenna might work for me will
have to do with how much preamplifier gain I will need at my particular
location to start to hear noise. I wanna use it on 160, 80 and 40 and the
gain of the 20 foot boom one is enough for 80 and 40 using a 30 or 40 dB
preamp.
Any help would be appreciated.
73 and Merry Christmas...Stan, K5GO/ZF9CW
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