I slipped a couple of feet of half inch automotive heater tubing over the 1
coax coming down my crankup. Then used the stock hygain arms. Coax is
fastened to each arm, again with the heater tubing, so that it does not
hang on ground. I don't want it to freeze down in the winter.
On Jun 4, 2015 12:03 PM, "Richard (Rick) Karlquist" <richard@karlquist.com>
wrote:
> On my HDX-5106, I have a 90 degree type N elbow at the
> end of a 2 foot long cable arm. There is a Kellem
> grip that holds 106 feet of 7/8 inch diameter coax
> that hangs down to the ground. The end of the big coax
> is connected to the 90 degree elbow. THe other end of
> the 90 degree elbow connects to a short run
> of buryflex coax that runs along the arm to the tower
> where it is spriraled around the mast. There had
> to be a connector involved at the top of the tower
> anyway, so why not use an elbow. (Yes, you do need
> to avoid junky coax elbows, get a quality one).
>
> Rick N6RK
>
> On 6/4/2015 8:09 AM, Peter Dougherty (W2IRT) wrote:
>
>> Hello all,
>> I’m using an old LM-470 crankup tower and have a question about best
>> practices in cable routing. At the moment I don’t have my coax feeds
>> bonded
>> to the top of the tower. Feeds from all four antennas, after forming the
>> rotor loop, are taped securely to a cable arm. They make a sharp 90° bend
>> and then dangle by gravity through two more cable arms in their run to the
>> antenna switchbox mounted at the base of the tower. That 90 degree bend
>> cannot be good for the bundle of cables. It’s high-quality stuff that’s
>> been
>> up there for 9 hot summers and 10 freezing winters now, and I’m thinking
>> of
>> replacing it either this year or next, as money allows.
>>
>> This picture shows how the cables are routed at present.
>> https://db.tt/Hd3R7rrI.
>>
>>
>>
>> Is there a preferred method of routing cables that doesn’t involve a sharp
>> bend like that? I’m imagining there’s quite a nasty impedance bump going
>> on
>> here, not to mention the potential for physical damage to the dielectric
>> in
>> the heat and cold, etc. If I’m going to spend hundreds of dollars in new
>> feedline, plus the costs of having it installed (I cannot climb, myself),
>> I
>> want to ensure it’s done to best engineering practices this time. I also
>> think having the lines bonded at the top of the tower would be a Good
>> Thing,
>> as well, so maybe a way to incorporate that and a new sweep or something
>> to
>> get the cables headed downwards more gently?
>>
>> Thanks in advance.
>>
>>
>> ---------------------------------------------
>> GO FRC!
>> Peter, W2IRT
>>
>>
>> www.facebook.com/W2IRT
>>
>>
>>
>> _______________________________________________
>>
>>
>>
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>>
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>
>
>
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