This is and always has been an area where antenna manufacturers wildly over
rate their gain figures. I have a pre-MFJ 205BAS which HyGain rated at
9.4dbd. The more accurate forward gain is just over 6db. You can look
anywhere-even the Ercolino brothers exxagerated the claims on their
antennas. Fortunately in this day and age there is computer modeling which
has greatly added to reliable figures when it comes to antenna gain.
Steve WD8NPL
-----Original Message-----
From: Jim Thomson
Sent: Thursday, December 11, 2014 6:14 AM
To: towertalk@contesting.com
Subject: [TowerTalk] Trap ID
Date: Tue, 9 Dec 2014 22:43:27 -0500
From: "Wilson" <infomet@embarqmail.com>
To: "towertalk" <towertalk@contesting.com>
Subject: [TowerTalk] Trap ID
Someone suggested Mosley, which seems correct.
A tribander with only six traps:
http://www.mosley-electronics.com/pdf/amateur/cl33m.pdf
Thanks,
WL
## There is NO way in hell you can get the dbd gains that mosely claims for
the cl-33-m !
They are claiming 7.3 dbd on 20m... 8.1dbd on 15m...and 8.5dbd on
10m.....all from just
3 trapped els on a 18 ft boom. They also claim 20 lbs per sq ft at 80
mph... for wind loading on the
6 sq ft yagi.... more nonsense. Dream on mosely, dream on. My F-12 5el
20m gai on a 35.5 ft boom
is rated at 7.3dbd. My f-12 6 el 15m yagi is rated at 8.5 dbd. Perhaps I
should toss my monobanders
and replace em both with the far supieor mosely... trap master Cl-33m.
Their FAQ is a riot. They solve
the balun issue...by not using one. They insulate both sides of the DE, then
tie braid to one side, and hot to the
other side.... then also bond the braided side...to the boom. Hey Mosley,
they have not made 52 ohm coax since
the mid 70s. The pix of their factory floor looks pretty cool, looks like
it was taken in 1957. Their monobanders
have more gain than anything ever made in your wildest dreams...check this
out.
http://www.mosley-electronics.com/pages/series/monoband.htm#power
Jim VE7RF
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