[Elecraft] Max-Gain MK-8

[HowardZ]

Well, maybe I'm being a little picky here, but the "Arrow 2m/440m j-pole" is
not a j-pole antenna.
Arrow calls it an "open stub j-pole" - but it's a new creation and borrowing
the popular "j-pole"name.

Looking at the pictures - the vertical element which has the coax cable
attached to it - well this item appears to be complete insulated from the
rest of the antenna.  Look at the parts list and there is a plastic
sleeve/washer that insulates it from the rest of the antenna.  I think the
other vertical elements probably do nothing at all except to make it
resemble a jpole?  Or maybe these additional elements are parasitic elements
- similar to a yagi's elements.  How does this antenna work?  I don't know. 
That's why I didn't buy it.

Instead I got a co-worker to teach me basic plumbing soldering skills to
build a Super Cactus J-Pole antenna.  It has more gain that a regular
J-pole.  Including soldering tools, I certainly paid more than buying the
Arrow "open stub j-pole" - but I don't want an antenna I don't understand. 
The Super Cactus J-Pole works well on my Winlink 2m RMS station.

Howard



list1 wrote:
> 
> I used an MK-8HD (50') for Field Day. I had an Arrow 2m/440M j-pole over a
> large dipole center insulator made from pvc pipe and used 300 Ohm ladder
> line and 140' of 14 gauge house wire.  Once three people guyed it
> perfectly
> vertical it was OK for the rest of the weekend.  However the top did bow
> before that.  I purchased the three fiberglass guy rings that were nice
> ($5
> each).  It was actually extended about 43 feet total.  I have some pics
> at:
> http://tinyurl.com/luwagy
> 
> Next time I will use a much smaller center insulator.
> 
> For NVIS, for MARS I will take off the top 1" OD section.
> 
> Steve, W2MY, AAR6CX
> 
> 
> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net
> [mailto:elecraft-bounces at mailman.qth.net]On Behalf Of Matthew Zilmer
> Do any of you Elecrafters have experience with Max-Gain's MK-8
> fiberglass mast (telelscoping poles)?  I'm interested in using their
> 50-footer guyed down as a center support for an 80m doublet.
> 
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