[TowerTalk] Old "new" Prosistel 61 - need comparison with current model 61D

[K8RI on TT]

On 8/15/2011 12:48 AM, K8RI on TT wrote:
> Hi Doug,
>
> On 8/14/2011 10:17 PM, W7ZZ wrote:
>
> I'm afraid I can't give you much of a comparison as I've never even seen
> one of the new one other than in photos.
> The older models do have some short comings and there were some design
> changes made during production, so how close that one is to mine, I
> don't know.
>
> The Rotators are rugged, but I'd not use one in an environment where
> there is a lot of salt in the air.  I've seen some really bad corrosion
> in some of those cases.
>
> Also there is a design flaw in the top of the rotator housing that
> allows water to set on the top seal. Actually it's a recess where the
> only way out is to evaporate.  I built a cover out of silicone rubber
> and filled that area with white Lithium grease.  Also the older rotators
> used a gear lube while the newer ones are not
(Correction - Should say,  NOW packed with Grease) packed with grease which

73

Roger (K8RI)
> "I believe" is white Lithium grease.  When I rebuilt my PST-61 I drained
> and cleaned it thoroughly before packing it with White Lithium grease.
>
> If you are mechanically inclined they are relatively easy to repair
> using Normal shop and garage tools and *most* but not all parts can be
> found at the local NAPA or automotive store including the bearings.
> Unfortunately the main worm gear and worm gear wheel are not.  They come
> from Italy and have had horrendous delivery times. I never did get one
> even though promised one under warranty.   I did not pursue it as I was
> able to salvage that part and turn down the outer shaft for the worm
> gear wheel to fit the first undersize seal.
>
> The new PS-T61 appears to have a better top seal with a cover and uses a
> DC motor.  There is also a heavy duty motor available.  They are now
> handled by either DX Engineering. These things are real power houses,
> but I think the Alpha Spid Canadian rotator is near the equivalent for
> relatively ham arrays for much less money.  Not quite as sophisticated
> looking, but I think my next one may be one of those. Well, other than
> the tribander and 7L 6-meter yagi on the 25G which will get a
> TailTwister even though it's not one of my favorite rotators.
>
>
> 73 and good luck,
>
> Roger (K8RI)
>
>
>> A local ham with a health issue is selling a new, never used Prosistel 61 that he bought in 2001 but never installed.  It's a 48 volt AC model.  It has the Prosistel control box, which I think is the C model.  I would like any information that can be provided on the differences between the old model that would have been sold in 2001 and the current version, which I know runs on DC (but I don't know what difference that really makes).  My debate is price for this new/old unit versus biting the bullet for the brand new one with a warranty.  I'll be turning a 4 element Steppir at 70 feet and a Cushcraft XM240 at 80 feet in a location that several times a year sees some high winds.
>>
>> Any comments will be welcome.  Any opinions on what a fair price for this "new" unit would be?  Thanks in advance.
>> Doug
>> W7ZZ
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