For such a length, would installing the motor-start capacitor, normally inside
the control box, nearer to the rotor help?
73, kelly, ve4xt
Sent from my iPhone
> On Apr 2, 2021, at 18:54, Joe Subich, W4TV <lists@subich.com> wrote:
>
>
>> A primary point/concern of my post is the length of the run on the temporary
>> 300 ft and to the final goal of 700 ft. What size of the
>> conductors/wire/cable to utilize for the effort. Some part being
>> heavy duty 8 conductor rotor cabling in conjuction with splices
>> and/or runs of UF solid wire cabling from 14 gauge to 10 gauge such
>> as 14/3, etc. or other such ideas on conductor size.
> You will need to figure out those trade-offs for yourself in your
> particular installation.
>
> The brake solenoid in the Ham IV/T2X is rated 24 VAC @ 5A. The brake
> uses wires 1 and 2 (the "heavy" wires).
>
> The motor in the Ham IV/T2X is rated 20 VA @ 2.25 A. The motor uses
> wires 4, 5, 6, and 8 plus wire 1. Rotation power is supplied to either
> 5 (rotate right) or 6 (rotate left). 4 and 8 are the capacitor
> connection and the return in wire 1.
>
> To energize the brake you have the voltage drop of (0.75 Ohm + the
> resistance of wires 1 and 8) x 5 A. To turn the motor you need to
> overcome the voltage drop of (5.0 Ohms + wire 5 or 6 + wire 4 +
> wire 8 plus wire 1) x 2.25 A.
>
> I do not know how much voltage sag the brake or motor can handle before
> they stop working reliably but I would not allow more than 2V drop as
> a first estimate.
>
> The typical "light duty" eight wire rotator cable is 2 x #18, 6 x #22.
> DX Engineering says "suitable for most controller to rotator cable
> runs of less than 125 feet." You could probably back out the voltage
> drops for a 100' run and use that as a "safe" limit. The so called
> "heavy duty" rotator cable is 2 x 16, 6 x 18 but is probably marginal
> at 300 feet.
>
>
> 73,
>
> ... Joe, W4TV
>
>
>> On 2021-04-02 7:10 PM, CEPitts wrote:
>> I would like to hear from those in regards to ideas for the following. I
>> know there are those who have long runs of control cabling for rotation,
>> switching, etc. so I seek your ideas and advice.
>> I have a need for a temporary set up of a run that is 300 feet from the
>> operating position shack/controller to the top of the tower controlling a
>> Ham 4 rotator. The final set up with be a run of 700 feet from tower to the
>> operating position shack/controller
>> Would it be best to provide a disconnect near the connection point at the
>> top of the tower with a short pigtail to the Ham 4, as well as a
>> disconnect/splice point at the bottom of the tower, and a final run to the
>> shack/controller?
>> Based on previous discussions/ideas tossed around here within the last 2-3
>> weeks I would most likely take some ideas from the group in regards to
>> utlizing trailer type connects/disconnects and also splices within the
>> entire run.
>> A primary point/concern of my post is the length of the run on the temporary
>> 300 ft and to the final goal of 700 ft. What size of the
>> conductors/wire/cable to utilize for the effort. Some part being heavy duty
>> 8 conductor rotor cabling in conjuction with splices and/or runs of UF solid
>> wire cabling from 14 gauge to 10 gauge such as 14/3, etc. or other such
>> ideas on conductor size. A reasonable cost/maintenance perspective would be
>> ideal keeping in mind going from the 300 ft to the 700 ft in the future and
>> ease of said transistion. None of this will be buried, I have that part
>> taken care of.
>> *(tower/rotor)*****short pigtail/run-->>>---*****(pigtail/connect
>> splice)*****run to bottom of tower -->>>-->>>-----*** **(bottom of
>> tower/connect splice) *****--->>>---->>>---*-****temp
>> run*****>>---->>>>>>>---->>>>>>----->>>>>>>------>>>>>------->>>>> 300 ft
>> expanding to 700 ft>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> (later to be
>> the permanent run)>>>>>>>>>>>>>>*** **to connect/splice back to 8 conductor
>> rotor cable ham 4 controller in shack.****
>> Besides possibly utilizing trailer type connects/disconnects I was also
>> considering utilizing 8-10 conductor terminal blocks for splices/junctions
>> etc. and I could possibly place those in weather resistant boxes at those
>> points where required....What is the thought on that approach?**
>> Thank you for all the input/ideas and73! Ed K5OF in NC
>> _______________________________________________
>> _______________________________________________
>> TowerTalk mailing list
>> TowerTalk@contesting.com
>> http://lists.contesting.com/mailman/listinfo/towertalk
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|