Separate names with a comma.
Discussion in 'Amateur Radio Antennas' started by towerdog, Jan 8, 2010.
they are a 7/8wave single element antenna,
i tried a ham buddies 7/8wave that he raved about against my identical looking but shorter 5/8wave and got more flutter on my mobile signal with the 7/8wave:thumbdown:,
if you mean a 5/8wave over 1/4wave colinear thats a different ballgame, the radiation angle can be manipulated by the designer to give a lower or higher radiation angle and higher gain than a single element antenna at the expense of vertical beamwidth, the result may or may not suite your mobile needs
The 3/8 x 24 threaded is model # CG-144
Trunk Lid Mount is # CGT-144
I've used one in the past. Work well. Best if you can locate in the free and clear.
MFJ Enterprises Inc.
thats it! what I was looking for, thanks. I beleve flutter can be caused by the whip whipping around too much in the wind, I heard you might have radiation pattern issues from insufficient ground plane from a 7/8 also but I will read up on it, and check the reviews out.
thats model, CG-144 is a 5/8 over a 1/4. I cant find a colinear for mobile but did find this stacked 5/8 colinear for base application. Base Model G7-144 with 7dB gain. If that 7dB is true, thats more than some directional antenna, pretty cool, I might try to build such a thing. Is co-linear the same as co-phased?
EXACTLY! Gain is not everything. I used to run a Diamond SG-2000HD antenna which is also a 7/8 wave. It was great for simplex mobile-mobile but was almost always beaten by a simple 1/2 or even 1/4 wave antenna when working repeaters high on the hilltops from the valley floor. I later switched to a Comet CA-2X4SR because of that and also the need for wider bandwidth. For somewhere on the great plains a 7/8 wave antenna is great. As for the "picket fencing" , or flutter, I actually had less with the 7/8 wave antenna then any other type.
I've definitely found the 7900 to be better for 2m simplex, but on 440, they both have their plusses and minuses. The Larsen shines on 440 with rolling hills and varied terrain, but the 7900 will kill it given long wide open clear shots to the machines. It's a tough call and I've been swapping them in and out fairly frequently trying to decide if either one is the 'winner'.