Hi Chuck,

Description of the more common ones.

https://www.navy-radio.com/manuals/tty/570-303-106-6412.pdf

And if you want a deep dive, including a lot of telegraph circuit theory.

https://www.navy-radio.com/manuals/tty/training--transmission.pdf

(5ESS and 5crossbar would be two different animals, right?   I don't recall seeing any 33 or 43 on the boy scout tour of the new 5crossbar in my home town that replaced a switchboard on the second floor of the business office)


---
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You said "tomorrow" yesterday.

The above comments or recommendations are SWAG. Use at your own risk.
John, W9DDD
On 6/20/2023 5:49 PM, Chuck Rehor wrote:
Hi GreenKeyers,

Pls forgive my complete ignorance, but what is a Polar Relay and what does it do? I’ve heard it mention here tons of times, and even though I’ve followed this channel for years, I am learning slowly. I’m mostly interested in Model 33 and 43’s (as they apply to 5ESS’s) but still appreciate all TTYs.

Thanks!
Chuck Rehor

On Tue, Jun 20, 2023 at 12:35 PM John W9DDD <[email protected]> wrote:
Just when you think you've read every tiny detail about teletypewritery, along comes another mystery. 

John, W9DDD


> On Jun 20, 2023, at 12:27 PM, B. Smith <[email protected]> wrote:
>
> Anyone have any info on this polar relay with the lever? The external lever varies a magnetic bias on the armature.
> k4che
> <3BTk4che.JPG>
>
>
> <3BTk4che.JPG>
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