[Boatanchors] I-82-A as antenna position indicator

[Jack Taylor]

A little bit off-topic, but this past week I was trouble-shooting an
antenna indicator.  Turned out the 110 vac 60 cycle selsyn transmitter
had the rotor slip rings burn up, melting the shaft in the process.

I found a smaller unit and made up a short 5-wire test cable and
verified it would run the in-shack indicator okay.  Modified the shaft
of the little guy so it would mate to the antenna drive gear and was back in 
business.

I would gather your options are either to provide 400 Hz to run both selsyn, 
or
swap out both 400 Hz units with 60 Hz?

Jack - N7OO


----- Original Message ----- 
From: "Mark Foltarz" <Foltarz at rocketmail.com>
To: <boatanchors at mailman.qth.net>
Sent: Tuesday, October 13, 2009 6:04 PM
Subject: Re: [Boatanchors] I-82-A as antenna position indicator


Well John WA4WDL got me a schematic. Answers everything except voltage and 
freq. I'm betting it is 28 V @ 400hz.

The actual drive selsyn is a Bendix AY-1. Turns out Fair in Lima, Oh has 
them.

Found a box of selsyns, some 60 hz, a couple 400hz.

It would be great to put that I-82 into meaningful service.

I understand that 400 hz selsyns can be made to operate on 60hz. I'm sure at 
very reduced ratings.

de KA4JVY

Mark







>
>From: "WA5CAB at cs.com" <WA5CAB at cs.com>
>To: Foltarz at rocketmail.com; boatanchors at mailman.qth.net
>Sent: Tue, October 13, 2009 6:27:46 PM
>Subject: Re: [Boatanchors] I-82-A as antenna position indicator
>
>Mark,
>
>I've never tried to use one for that but the I-82-A (and smaller I-81-A) 
>schematic and point to point DC resistance readings are shown in the 
>SCR-269 manuals. T.O. 08-10-175 (on SCR-269-G) shows Pin 1 Ground, Pins 2, 
>3 and 5 to the three stator terminals and Pins 2 and 4 to the rotor 
>(armature) terminals.
>
>1 - Case (Ground)
>2 - Phase 2 and Rotor
>3 - Phase 1
>4 - Rotor
>5 - Phase 3
>
>Resistance Readings:
>
>1 to case - 0 ohms
>2, 3, 4 or 5 to 1 - Open (Infinite)
>2 to 3 - 16 ohms
>2 to 5 - 16 ohms
>2 to 4 - 55 ohms
>
>The connector is PL-118.
>
>In a message dated 10/13/2009 3:55:48 PM Central Daylight Time, 
>Foltarz at rocketmail.com writes:
>
>Group,
>>
>>Has anyone had sucess using the I-82-A indicator as for antenna 
>>positioning ?
>>
>>Can't seem to find info on the pinout anywhere.
>>
>>de KA4JVY
>>
>>Mark
>>
>
>Robert Downs - Houston
>wa5cab dot com (Web Store)
>MVPA 9480



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