[GreenKeys] Testing 255A Relay

[Nick England]

Note. The 314A coils are 136 ohms each. A 9v battery might be a better
choice to make contact closure, since you can’t see the 314A’s contacts
wiggle.

On Tue, Feb 7, 2023 at 9:00 AM Tom Hunter <tomhenryhunter at gmail.com> 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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-- 
Nick England K4NYW
www.navy-radio.com
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