[TowerTalk] Prosistel PST-61 or PST-2051

[Peter Voelpel]

No, the PST2051 would not survive.
I have four of them and all four were damaged already with gear failures.
Three had the same failure, the side bearing of the worm axis had been
pushed out of the housing inclusive its cover.
The forth one was damaged by entered water.
The three with the bearing problem did turn much less then the specs claim.
Wind was not more then 50-60 miles/hr and the antenna was a 5 element 20m
yagi (13m boom), the third turned a shorty forty HyGain Dicoverer two
element yagi.

73
Peter, DJ7WW


-----Original Message-----
From: towertalk-bounces at contesting.com
[mailto:towertalk-bounces at contesting.com] On Behalf Of David Gilbert
Sent: Samstag, 5. Mai 2012 19:31
To: towertalk at contesting.com
Subject: Re: [TowerTalk] Prosistel PST-61 or PST-2051


I have a PST-61D turning an Optibeam OB16-3 (sixteen element tribander 
on a 30 foot boom weighing 100 pounds) and an OB2-40 (two element coil 
loaded shorty-40).  I live at the southern end of a mountain range in a 
windy southern Arizona county that can generate swirling wind gusts in 
excess of 90 mph and regularly (every day for about two months in the 
spring) generates gusts between 60 mph and 80 mph.  I've seen the 
elements of the very strong 40m yagi bent into a full C-shape, and when 
the swirlers hit the tower dead on the torque on the rotator is 
horrendous because the wind force isn't balanced ... the forces on the 
ends of the boom add up rotationally.

I can't really say whether the PST-2051 can stand up to that kind of 
abuse, but the PST-61D has done so for four years now.

73,
Dave   AB7E




On 5/5/2012 9:56 AM, K8RI wrote:
> On 5/5/2012 10:35 AM, Chuck Sudds wrote:
>> On 5/5/2012 8:16 AM, Bill Jackson wrote:
> Chuck has made the same suggestion that I was going to make.
> My choice would be either the PST61, (I have one of the old ones) or the
> AlphaSpid although I believe there several other good rotators that use
> double worm gear drives or planetary gears. I do not like any rotator
> that used a wedge brake.   The early PST-61s had a physical design
> problem that allowed water to collect on the top seal which then caused
> the shaft to rust which then wore out the seal which then let water in
> which then caused the top bearing to go to pieces.  At least the
> bearings weren't expensive as the are the wheel bearings for compact
> cars. I understand the new model has protection for that top seal.
>
> I'd rather overspend some than under spend even a little.
> With the AlphaSpid or the PSt61 you don't have to worry about operating
> on windy days.  If it get *that windy* you better have your insurance
> paid up.<:-))
> You do have to be concerned about fit with the PST61.  It's large and
> heavy.  (which is good) but you may have a problem getting it to fit in
> a 25G. I had to turn the motor 90 degrees so it's horizontal and sticks
> out the side of the 45G. The motor sticks out to the left side of the
> tower near the bottom of the photograph in
> http://www.rogerhalstead.com/ham_files/Tower29.htm
>
> 73 and good luck,
>
> Roger (K8RI)
>
>
>
>
>> Bill
>>
>> Have you looked into the Alpha Spid rotors?  I am in the process of
>> upgrading my T2X that you know first hand at my station with the BIG RAK
>> Alpha Spid.  I have it here in my shack if you want to check it out
>> "first hand!"  Hope to have it on the tower in the next couple of
>> weeks.  I too am tired of trashing T2X rotors. Hopefully the last rotor
>> I will ever have to buy.
>>
>> 73,
>> Chuck  KØTVD
>> www.dxham.net
>>
>>
>>
>>    >   I am prepared to spend what is necessary to purchase a reliable
>> rotor, but at the same time I don't want to overspend either.
>> _______________________________________________
>>
>>
>>
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