Hi Steve,
I have not used either of these yagis -- mine is a HB 7 el on a 22' boom --
so here is my opinion. (And remember, my opinion is free -- probably what
it is worth.)
Since forward gain is a strong function of antenna length in wavelengths --
and if I remember, doubling the length adds 3 dB in gain -- the CC
theoretically will have more forward gain. Perhaps 1 dB? HOWEVER -- more
elements allows the antenna designer to tailor the pattern better, so 7
elements might allow M2 to improve Front-to-rear and sidelobes, making that
one quieter and giving a better S/N to your wanted signal.
My opinion -- it really will depend on the pattern. Try to find some
patterns for these two and compare them. My GUESS is to go with the M2.
And remember, I have no experience with either of these two yagis.
73 -- Larry -- W1DYJ
----- Original Message -----
From: "Steve K7AWB" <k7awbgoog@gmail.com>
To: <towertalk@contesting.com>
Sent: Saturday, April 13, 2013 7:19 PM
Subject: [TowerTalk] 6 meter antenna comparisons
I have a choice of two 6-meter yagis to put up at the 112 foot level on my
tower. A Force 12 5BA ( 5 band, 15 element HF) goes at the tower top at
103 feet and above it about 9 feet will be the 6-meter yagi.
I have both a used M2 6M7 (7 element) and a Cushcraft 617-6B (6 element).
I don't want to use my 6M7JHV because I am saving it for an array latter.
The M2 6M7 is rated at 10.5 dbd while the Cushcraft is rated at 14 dbd in
the manual although, in the VE7BQH list, is shows at 10.17 dbd and I take
company specifications with a grain of salt. The Cushcraft has a 34 foot
boom while the M2 has a 26.5 foot boom; both weigh about the same. The
VE7BQH list is at: http://www.bigskyspaces.com/w7gj/6mTable.htm
Anyone have any opinions on which one to use? The purpose of the antenna
is to work the "weak" ones.
73
Steve Sala
K7AWB
DN17es
Nine Mile Falls, WA
491 ARRL approved 6-meter grids confirmed
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