Zack,
I'd be interested in the 144 MHz yagi design for backpack portable
operating.
Its got to be compact and easy to assemble, otherwise it tends to get
left at home.
For me, compact is nothing longer than 40 inches.
(I'm actually thinking SOTA more than VHF contesting but I sometimes
combine the two.)
73, Bob K0NR
On 15-Feb-18 7:57 AM, Zack Widup wrote:
I got a design from VE3BFM for a four-element 6m beam on a 13 foot boom.
It's a great performer. Since I operate portable 95% of the time, I built a
version I could quickly assemble and disassemble at a portable site. The
boom and each element is in two pieces. I never formally wrote up an
article about how to build it, but I did talk about it at the VHF forum at
Dayton a couple years ago. Maybe I should write it up.
I have similar portable Yagis for 144 through 432 MHz. I can assemble and
disassemble them pretty quickly. My 144 MHz Yagi has six elements
wide-spaced on a 12 foot boom. I believe the gain predicted by Yagi
Optimizer is about 12 dBd. I haven't measured it yet.
73, Zack W9SZ
On Thu, Feb 15, 2018 at 8:23 AM, jon jones <n0jk@hotmail.com> wrote:
Mark:
Another idea is to build your own portable 6 meter beam. I have found a 2
element yagi is easy to build, break down and re-assemble quickly. A 2
element yagi offers about 3 - 4 dB gain over a dipole. It is easier to put
up and take down than a 3 el.
I use one for my VHF contest and portable operations. A picture of it is
in the NCJ March/April 2016 pp. 32. It works... have WAC with it on 6 with
100 W from KS on ssb/cw.
A plan for one is here: http://www.qsl.net/k7yo/6m2Yagi.htm
- Jon N0JK
________________________________
Hi:
I finally took delivery of a suitable LiPo battery to facilitate "back
pack portable" operation at the 50 to 100 watt level. If any of my
Canadian colleagues are interested I can provide the contact details for a
Canadian distributor.
At this point I'm planning on simply taking my 50 MHz three element beam
apart and re assembling it on site. In my view the beam I have isn't
really intended for that type of use and I'm curious if anyone knows of any
suppliers for small 50 MHz beams that break down and re assemble quickly
and easily. Google searching on my part didn't turn up anything that is
currently in production.
I'm hoping to shift my focus a bit this year and actually reach the true
summit of at least one local mountain (vs simply driving most of the way up
via logging roads.) Having this ability would also have been useful
earlier this year when I had to abort my CO81 visit during the sept
contest. In hindsight I suspect I could have activated the grid for a few
hours on foot.
73
Mark S
Aligned Solutions Co.
mark@alignedsolutions.com
604 762 4099
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Bob Witte K0NR
bob@k0nr.com
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