My experience with quite a number of the JKs is that they use machined
aluminum clamp sets for the boom. I personally don't like working with
antennas on the ground so I build them on a trio of saw horses. The
element sag is less than the saw horse height on all my JKs so that
allows me to do the alignment very easily.
The only muffler clamps I've seen on the JK are for the boom to mast on
smaller antennas (15 & 10) - there he has 4x of the clamps and the
clamps have a flattened and knurled surface which bites into the mast.
The "problem" with these clamps is when you are setting the beam
direction once it's mounted on the mast. They will absolutely not slip
at all so you have to really loosen them up to get the beam to turn by
hand. Of course that is what you want after you do get the beam
direction set.
73/jeff/ac0c
alpha-charlie-zero-charlie
www.ac0c.com
On 25-Jul-18 1:59 PM, rlvz--- via TowerTalk wrote:
But don't the JK antennas use muffler type clamps for attaching the elements to the boom where
the elements must be lined up by sight? I hate fooling around aligning elements by sight
only to have them change when you tighten the clamp. Pre-drilled element brackets
are much nicer and my idea of a well designed antenna.
73,
Dick- K9OM
## I spoke with Ken, W3JK a while back on the telephone, and yes, indeed, he does
make a new and improved version of the oem F12 5BA. It has more gain, better FB,
better FR, better swr than the oem F12 5BA, and is stronger built....and uses
TWO LESS
eles than the oem 5BA. The JK improved version is well though out.
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