[TowerTalk] Fwd: Info needed fo Small Selsyn Units

[Gene Fuller]

Just to add a  little mud to the water, I have three old "sylsens" in hand 
with the following tagged info on them -
All three are five wire General Electric units and measure about 2" dia x 3" 
(plus contact block) long -
Unit #1
SELSYN GNERATOR       Model No.      RESOLVER  2J1H2
Nothing stamped in boxes for "v" or "cy"   NO. 681502
NAVY TYPE NO.CG-211905
Unit #2
SELSYN CONTROL TRANSFORMER
MODEL NO.  2J1G1
57.5-57.5 V   400 CY    NO. XA 3
I haven't opened either of these two up , but from what I can see through 
their windows they look quite alike except the "Resolver" may have a bit 
heavier wiper contacts.
Unit #3
SELSYN  CONTROL TRANSFORMER
MODEL NO. 2J1M1
105/63 V   60 CY   NO. 6315305

I picked them all up back in the 50's and in my youthful innocense, since 
they all said selsyn on them and had five wires I wired them in parallel, 
put 110 vac on them mounted one in a box with a map and the other with a 
home made gear matached up to a PPM and let'em play. Yes, a little hum and 
buzz but they worked that way for years.
I also have a couple of larger ones (perhaps 3"dia x 4.5"long) which I can't 
get to right now but I think they are both 60 Hz models.

I did also manage to find a nice commercial gear (stamped Martin 35-36) 
which was a perfect fit for the Prop Pitch bevel gear. - Got a machinist in 
a local shop to fit it onto the 60 Hz selsyn shaft for a  bottle of Crown 
Royal. - two or three times the cost of the gear - but the net result looks 
great - not yet installed.
Gene / W2LU

----- Original Message ----- 
From: <hanslg at aol.com>
To: <towertalk at contesting.com>
Sent: Tuesday, December 01, 2009 11:10 PM
Subject: [TowerTalk] Fwd: Info needed fo Small Selsyn Units


>
> Hi Dennis,
>
> If my memory serves me right you have the right combination. I believe the 
> "M" stands for "receiver" and the "G" should stand for "transmitter". The 
> are military specifications that totally explains exactly what the 
> different symbols stand for, but I can't find them right now.
>
> You have to look what the requirements is for the 2J1G1 module, if it is 
> the same voltage rating. My guess from the type numbers, they should be 
> the same.
>
> If you have a power source that gives you 57.5V 400 Hz you are all set but 
> if you don't there are ways around that. You can feed (or excite as it is 
> called) the units with a lower voltage and 60 Hz without damaging the 
> units. The output torque will be lower but if you can live with it you are 
> set. Best is to check the current drain at 57.5 volts, 400 Hz and then 
> look for the same current draw at 60 Hz. An other way is to, simply, 
> reduce the voltage to 60/400 of the nominal voltage, in this case 8.6 
> volts.
>
> Wikipedia has some excellent articles about selsyn that I recommend you 
> read before you try to hook the selsyns together.
>
> Good luck and 73 de Hans - N2JFS
>
>
>
>
>
> -----Original Message-----
> From: Dennis Vernacchia <n6ki73 at gmail.com>
> To: towertalk <towertalk at contesting.com>
> Sent: Tue, Dec 1, 2009 5:27 pm
> Subject: [TowerTalk] Info needed for Small Selsyn Units
>
>
> I have a  small 5 wire 57.5V 400Hz Selsyn unit  that measures 2.25" O.D. 
> at
> mounting ring and 1.9" main body
>
> the nomenclature for it is 2J1G1
>
> Can anyone tell me if a 2J1M1,... which looks physically about the same
> and is also  5 wire unit can be paired up with the 2J1G1 that I have as
> a receiver send pair
>
>
> 73, Dennis N6KI
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk at contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
>
>
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk at contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk