[CQ-Contest] Pro sis tel rotors

Carsten Esch carsten.esch at appello.de
Thu Feb 15 03:14:07 EST 2007

Hi Mike,

how old is the rotator and what model is it? We are distributing ProSisTel
here in Germany and for quite some time there is special 'silicon grease'
used in the rotators at least good to -30°C or so ... We have sold quite
some of these rotators to a commercial project in the artic region ...  

If the rotator is 'very old' it might be worth to exchange the 'normal
grease' with silicone grease. 

Another possibility might be that very humid air froze the 'whole rotator'
from the outside?


Carsten, DL6LAU

-----Ursprüngliche Nachricht-----
Von: cq-contest-bounces at contesting.com
[mailto:cq-contest-bounces at contesting.com] Im Auftrag von Mike Kasrich
Gesendet: Mittwoch, 14. Februar 2007 23:07
An: 'cq-contest'
Betreff: [CQ-Contest] Pro sis tel rotors

Anyone out on the list have this brand of rotor?  Im interested in 
whether you have had problems with the rotor freezing up in cold wx.  We 
had a prolonged period of wx below 20 and below zero and the rotor has 
stopped turning here.  The one day where it approached 30 it worked 
fine.  Was wondering if there was a fix or if this was just a horrible 
choice of rotor on my part.

It's interesting on my small tower I have a HD-73 and it turns just 
fine, slow when the temp is 8 below but it turns.  Never had an issue 
with the Ham IV I had up at my other location either.  Is this just a 
cse of fine I-land engineering down to 0C only or is there a fix of 

You can reply off list if you wish.


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