To everyone:  THANK YOU for all your ideas. I can only work on this machine in the evening and will do so tonight.  But I am very grateful to what everyone posted and I am going through that now.

And yes, John, I have a spare to test. I think I got it from you ;-)

It may take a couple of days before I can report back with an update.

What a fantastic group we have here on Greenkeys.

Paul




On Feb 7, 2023, at 7:20 AM, John, W9DDD <[email protected]> wrote:

Hi Tom and Paul

Tom the 314 is a sealed unit with mercury wetted contacts.  Can't see what is happening.

Paul if you had a 255 or 215, you would be able to hear the clickety click of the signal as the armature fluttered back and forth. (No I haven't learned to decode baudot that way yet.)

Short of having a real test set, the best you could do is Tom's method with a battery and VOM.  Some test literature I've seen actually used low voltage 50-60 Hz as the test signal.  If I can find it again, I'll post.

Do you have  spare 314 or 255 to swap out?  ( I have spares)


On 2/7/2023 7:59 AM, Tom Hunter wrote:
Paul,

I put one of my 255A Polar relays on the bench to go through a test on it. Pins 1 and 5 are numbered on the bottom. You can count down to the rest. The two coils on mine (pins 2 & 7 and and 3 & 6) each measured 128.6 ohms.
Pin 1 shows continuity to the frame and armature.  Pins 4 & 5 show continuity, each to a stationary contact. Pin 8 is not connected on mine.

When I tested the contacts with an ohmmeter and moving the armature by hand they barely worked. A piece of bond paper cured that problem.

A 1.5 V D cell was on one winding was enough to cause the armature to move. My relay is out of adjustment so I could only get it to move one way. If your relay is in adjustment reversing the polarity of the battery should get the armature to move the other way.

The attached illustration is from the New RTTY Handbook. I could send you the adjustment procedure  from the same source if you need it. It worked for me on the 255A I am using with a military Dovetron.

I am posting this to the group in the hope it may help others.


Tom N3CRK


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The above comments or recommendations are SWAG. Use at your own risk.

John, W9DDD

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