I've just helped recommission one of the former KABC vans for a virtual
classrom, satellite link, 802.11, 2m, 70cm, & GMRS radios, etc. for the
upcoming ARLISS rocket launches (see aeropac dot org) There was no
hardline anywhere in this van. What may look like hardline is a coil of
Nycoil nylon 1.25" id coiled air hose which is used as a flexible
conduit. There were 19 cables inside the old Nycoil and they are
impossible to remove. I had to buy new Nycoil ($1k+ for 70') and pull
new wires, which was a struggle and uses some tricks. If there are
uwaves or UHF the amps/preamps were at the top of the mast, a 40 footer
in our case.
The Wil-Burt local guy was helpful. The up/down action of the mast
tends to twist the wires inside. They don't recommend any solid
conductor cables. The cable load for the new conduit was 2 x Buryflex,
2 x RG8X, 2 x CAT5e, DC power, AC power, pan/tilt control head 8
conductor. Lots of TFE pulling grease and 5 people got them pulled. We
tied the Nycoil every 5' to a strong fence, so it was pretty straight,
otherwise it is impossible to pull through the loops.
Grant
KZ1W
Charlie Gallo wrote:
>
> ...snip...
>
> Let's face it, you know those TV remote trucks you see? (here in NYC, all the
> time) - what do they use on that mast? Hardline! The trick is, is you look,
> is it makes a BUNCH (a BIG bunch) of turns around the mast so that the wire
> doesn't move all that much each time the antenna is raised/lowered/turns
> (That and the fact that they are willing to replace the cable more often than
> most of us)
>
>
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