[TowerTalk] Need Rotator

[K8RI]

I use the PST-61 and like it, but there are some short comings of which you 
may already be aware.
It's  good rotator, and I like the control box, at least the digital one. 
(No mine is not for sale)

However: Although the rotator is rugged, the top seal is prone to failure 
and the design will let water collect on the shaft where it goes through the 
seal. This causes corrosion on the shaft which in turn eats up the seal 
which in turn lets in water which trashes the bearing.  The top two photos 
on http://www.rogerhalstead.com/Gears.htm show that can happen in relatively 
short time.  A bit of forethought building a cover can prevent this. The 
other is the main worm gear wheel is a large brass gear pressed or cast onto 
a steel mandrill. it's fragile when pressing out the inner shaft so care 
must be taken not to press against the actual brass..  This gear is, or can 
be difficult to obtain with the possibility of very long delivery times. 
(they come from Italy) unless a replacement can be found.

I don't have the page finished yet, but hope to get the assembly and 
machining photos up shortly.

Were I to choose a rotator I still like the Prosistel, but would go witht he 
newer ones rather than the older. Both have tremendous torque and holding 
power without using an actual brake.

BTW the complete rebuild cost me about $100 and took about 5 hours actual 
working time.

73 and good luck,

Roger (K8RI)

> Good morning,
>
> I am looking for a used Pro.Sis.Tel "Big Boy" series rotator in good
> physical and operational condition. I need the model PST-51 or PST-61. I
> prefer the 51. These models are the earlier design which uses AC motors.
> The new designs use DC motors.
>
> I don't need the control box, but will take it in a package deal.
>
> Please contact me directly if you have one of these you would be able to
> sell at a reasonable price.
>
> Thanks,
>
> Dave, K4TO
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