The key to a reliable pneumatic mast is to use an antifreeze mister in the
compressed air line. The Ethylene Glycol mixes with the water and is
discharged when the mast goes down. The Glycol also lubricates the aluminum.
If you find an ENG van on the used market it may already have the Glycol
injector.
73, Fred K2TR
John D'Ausilio <jdausilio@gmail.com> wrote: You also can't load those pneumatic
masts too heavily either, and
water retention and freezing has been a problem for at least one rover
I'm aware of.
I adapted a 20 foot crank-up pole (army surplus lighting system) and
set it on top of a yeasu G800 rotor, and I can crank up my entire
H-frame /dish with 903-10G up in about a minute. Running height is
under 12 feet.
As far as Mike's rover layouts .. trailers can be bad depending on the
type of roads you travel. Small is better than large, better gas
mileage and gets into more places. I'm in a minivan ('88 Astro) and
I'm considering a move to a full-size van .. but I don't want my
height over 12ft and that's going to be tough with the additional
height of a standard van.
http://w1rt.us/c1.jpg
de w1rt/john
On 8/8/07, Mike (KA5CVH) Urich wrote:
> On 8/8/07, Nate Duehr wrote:
>
> > A radio/TV truck with hydraulic mast and/or a cellular-on-wheels (COW)
>
> Mike wrote
>
> I looked at a couple of used ENG (Electronic News Gathering) vehicles
> with pneumatic (not hydraulic) towers but way outside of the range of
> my expendable dollars.
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