[TowerTalk] Looking for a pair of selsyns for an old Telrex rotor

[Dubovsky, George]

Andy,

If I recall correctly, the Control Transformers are the least useful of
all the Selsyn stuff. I think they are three-phase on both rotor and
stator, but I can't remember why. I have hooked them up using just two
terminals on either the rotor or stator (can't remember which now), and
all three of the other, and they _DID_ work, but with piss-poor torque -
definitely good enough for a rotator direction indicator though.

If the "Generators" are the same as "transmitters", two of them will
work great together. As Jim Lux commented, TX and RX units seem to be
identical as far as we are concerned. If all else fails, at home I have
a copy of a Navy Tech Manual (that Fair Radio used to sell) on Servo
Systems, and it covers a lot of this stuff; I can copy parts of it if
you need it. Good luck...

geo - n4ua

> -----Original Message-----
> From: towertalk-bounces at contesting.com [mailto:towertalk-
> bounces at contesting.com] On Behalf Of Andy Bazar
> Sent: Monday, August 29, 2005 7:40 PM
> To: k4zrj at mindspring.com; towertalk at contesting.com
> Subject: [TowerTalk] Looking for a pair of selsyns for an old Telrex
rotor
> 
> Hello Charles Johnson,
> I found a wooden box full of these items while walking
> my dogs today along the street.  There are model
> 2J1G1, Selsyn Control Transformers and 2J1F1 Selsyn
> Generators of various condition in the box.
> 
> I came across your note when looking for information
> on how to connect these units and use them for
> something practical.
> 
> I will trade you a couple units plus shipping cost for
> some information on how to use them and how to deal
> with the fact that they are 400 cycle units if you are
> interested.  I was going to see what happened using
> lower voltage 60 cycle on a set but won't do it till I
> hear from you first.  I suspect that might result in a
> funeral party for both of them.
> 
> I presume that one way to use them is to connect all
> the same terminals of one unit to the other unit and
> then apply 57.5 volts ac at 400 cycles across the R1
> and R2 terminals and find that turning the shaft of
> unit #1 will turn the shaft of unit #2 a corresponding
> amount.
> 
> If you are interested, let me know.  I did find some
> application information on them but nothing very
> detailed and nothing which got into the reason why
> these particular units were 400 cycle.  I suspect that
> would improve their resolving accuracy but that's
> purely a guess.
> 
> I thought that I might be able to use them as a wind
> direction indicator or perhaps a rudder angle
> indicator for my sailboat.
> 
> Andy Bazar
> awbazar at yahoo.com
> Scottsville, NY
> 
> 
> 
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