[TowerTalk] Fulton K1550 / K2550 Swap: Cable Question

[Roger (K8RI) on TT]

More layers mean a larger arm from the axis of the drum.  The more 
layers, the more force it take on the input for the same pull on the cable.

As for supporting coax on any tower, not just crank-ups you want to 
avoid sharp bends.  Sharp bends mean the dielectric ends up supporting a 
major portion of the weight leading to center conductor migration off 
center even with solid dielectrics although they are much more 
resistant.  Devices as shown through links work well.  I prefer  an arc 
or sweep made of EMT conduit. I'm partial to permanently adhering the 
coax through the whole arc with epoxy, It makes the shield and jacket 
support more of the load.

Depending on the coax  and tower height, there should be "support turns" 
every so often along the height.  Crank up towers make this approach a 
bit problematic although it can be done.  Like many "fixes", Where there 
is a will there is a way!


73

Roger (K8RI)


On 6/4/2015 10:51 PM, Don W7WLL wrote:
> Fulton, as I recollect, advised me that a minimum of 5 to 8 wraps on 
> the drum (not a full layer) is recommended to remain at full cable pay 
> out. I was also advised to NOT have more cable on the winch drum than 
> needed to accomplish the job. More layers add more needed pulling 
> power. Ask Fulton, they are very responsive. I have K1550's on both of 
> my 70 and 51 foot crankups and the 70 foot tiltover fixture. I use a 
> K1250 on the 51 foot tiltover fixture. But, one may feel more 
> comfortable with more cable and bigger winches.
>
> There was also some earlier discussion on this reflector about how to 
> support hanging coax. Those of you who had an interest should read 
> K2STN's paper on a great rope trick using the old whipping technique. 
> I use this method for supporting  wire antenna coax's and when I was 
> using a G5RV as a portable antenna I used it between the ladderline 
> and coax to take the load off the xmfr. Simple, cheap and works great.
>
> Don W7WLL
>
> -----Original Message----- From: Tony
> Sent: Thursday, June 04, 2015 12:07 PM
> To: towertalk at contesting.com
> Subject: [TowerTalk] Fulton K1550 / K2550 Swap: Cable Question
>
> All:
>
> I recently replaced the Fulton K1550 winch on my U.S. Tower rasing
> fixture with a Fulton K2550. It was a direct swap so I didn't have to
> modify mounting plate.
>
> My only concern is that the wider spool of the K2550 has 2 layers of
> cable on it so it will be down to last layer when the tower is tilted 
> over.
>
> Although most of the last layer will still be on the spool, I need to be
> sure that it provides enough grip to safely lower and raise the tower.
> The K1550 had 3 1/2 layers to work with.
>
> So should I leave it as is or buy a longer cable?
>
> Tony
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk at contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
>
>
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk at contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk


-- 

73

Roger (K8RI)


---
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus