FWIW, I have a 250-foot run that includes power and control for two
rotators, plus coax and two runs of waterproof CAT-5 for controls. It
is on the surface, but bundled together. After 20 years, it is mostly
overgrown by woodland ground cover. I have no indication of any
cross-coupling.
I do disconnect everything at the shack entrance when not in use. Took
a direct hit on the top of the tower maybe 10 years ago, and lost
nothing due to conducted voltage except the rotators and switches on the
tower. The nearfield damaged our telephone answering machine, as wellas
two computers on a wired network. We now use wireless.
73, Pete N4ZR
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On 7/9/2015 8:10 PM, Roger (K8RI) on TT wrote:
Although code requires they be separate, for a DIYer if it won't be
inspected, you can do anything.
My preference is, if it will be carrying power (120 VAC) I'd run them
separate mainly because of lightening and possible common mode noise
pick up. (RF into the AC, or noise into the coax?) That you won't know
without trying.
I'd be uncomfortable with a 200' run of intimately coupled control,
power, and RF cables.
I even run my CAT-5 Gigabit network separate, which is probably a good
thing. Lightening got into the network last Summer and took out a
router, 8 port switch, 3 NICs and one motherboard. It melted an RG45
into the UPS and welded the pins together, but no damage to the rig
down stream although I'll never be able to use the network protection
in that UPS again.
What would your insurance Co say if you had an expensive lightening
strike?
73 es good luck
Roger (K8RI)
On 7/9/2015 3:52 PM, Mike Fahmie via TowerTalk wrote:
No 'compelling' reasons come to mind though my preference is to keep
power and signal wiring separate.-Mike-WA6ZTY
From: William Fairbanks <Bill.Fairbanks@indstate.edu>
To: "towertalk@contesting.com" <towertalk@contesting.com>
Sent: Thursday, July 9, 2015 6:10 AM
Subject: [TowerTalk] Running Cables - Shack to Tower
Hello,
I have a Rohn 25 up about 85' located about 200' from my garage
radio room. Is there some compelling reason why I shouldn't run
bury flex coax, rotor cable and outdoor 12-2 w gnd through a 2"
plastic pipe (already buried) between the tower and my shack?
Bill Fairbanks, N9ela
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