[TowerTalk] Rotor Cabling Query

[Robert Harmon]

I see what you mean.   Oh well,   so much for that idea .......................


Bob
K6UJ




> On Apr 5, 2021, at 10:20 AM, Steven Katz <stevek at jmr.com> wrote:
> 
> How will it rotate at all without the brake power engaged?   That's what "releases" the brake.   Unpowered, it's engaged.
> 
> -----Original Message-----
> From: TowerTalk <towertalk-bounces at contesting.com> On Behalf Of Robert Harmon
> Sent: Monday, April 5, 2021 10:18 AM
> To: TowerTalk <towertalk at contesting.com>
> Subject: Re: [TowerTalk] Rotor Cabling Query
> 
> So will the HyGain Tailtwister hold securely with no creeping if I disconnect  the brake wire ?   I have had the typical stuck brake scenario with my old Tail Twisters in the past and I like the 
> idea of not using the brake circuit if possible. I always let it coast to a stop anyway.    I have a new TailTwister replacement going up in a couple of weeks.  
> 
> 
> Bob
> K6UJ
> 
> 
> 
>> On Apr 5, 2021, at 9:56 AM, john at kk9a.com wrote:
>> 
>> You can save a lot of heavy gauge wire by using a rotator without a brake. A brake adds controller complexity, it sometimes sticks and it requires two extra conductors. I believe only Hy-Gain uses brakes. I have not owned a rotator with a brake in decades and even my 60 ft boom antennas to not creep in the wind.
>> 
>> John KK9A
>> 
>> Lux, Jim wrote:
>> 
>> 
>> The brake draws 5A @ 24V according to the manual. You probably need 
>> 20V or so minimum, so for 1400 ft (out and back), to keep the voltage 
>> drop at 6V from the usual 26V transformer, the resistance has to be 
>> less than about an ohm.  AWG10 is 1 ohm/1000 ft.  So you'd need what, AWG 8?
>> That's a pretty substantial expense.
>> 
>> The manual calls for AWG14 for 300 ft. You're running more than twice 
>> that, so to keep the resistance the same, you need to go down 3 gauges
>> (3 gauges is twice the area/half the resistance). They call out AWG16 
>> for most of the other wires than the common and brake. (The motor 
>> draws
>> 2.25A)
>> 
>> 
>> Someone probably makes a suitable interface (Green Heron?).
>> 
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