[GreenKeys] Polar Relays on RS232

[W2HX]

This is a good discussion! But, once you are successfully communicating in RS232, one must use some terminal software that will read and write Baudot. So who has such software? I know people use MMTTY and other RTTY tools, but these typically communicate in audio tones.

Does anyone know of software that will talk Baudot instead of (or in addition to) ASCII?
Many years ago (sometime in the early 1980s) I borrowed a Hazeltine 1500 dumb terminal (from Hazeltine which had an office somewhere in Long Island), and it had a Baudot mode. But as I wasn’t yet a ham back then, I never played with it.

So who has some Baudot terminal software they can recommend?


73 Eugene W2HX/4
My Youtube Channel: https://www.youtube.com/@w2hx/videos


From: greenkeys-bounces at mailman.qth.net <greenkeys-bounces at mailman.qth.net> On Behalf Of paul cembura via GreenKeys
Sent: Saturday, February 28, 2026 4:30 PM
To: greenkeys at mailman.qth.net; Tom Hunter <tomhenryhunter at gmail.com>
Subject: Re: [GreenKeys] Polar Relays on RS232

Hi everybody

Yes I still have dozens  314A relays for $20.00 plus shipping.

mr_rtty


On Saturday, February 28, 2026 at 12:30:26 PM PST, Tom Hunter <tomhenryhunter at gmail.com<mailto:tomhenryhunter at gmail.com>> wrote:


I have successfully used a common 255A  polar relay,
314A polar relays, which are nice because they are sealed and never need adjustment.
and some octal based, tube size, polar relays with no manufacturers named that  I
must have bought at a hamfest so long ago that I almost forgot that I had them.

i have used polar relays on several RS232 devices with no problems.
I saw the idea somewhere on the internet and have used it many times.

Do an eBay search every week for "polar relay"  or "teletype relay" until you
find a real teletype polar relay for a good price.

 very
I just found this one:

eBay item number:22713295371
$25.99 and $7.90 shipping.  That is not a great price, but it is not bad either.

Let me tell you about 925ella. She always has a "make offer".  But if you
make an offer, she never says yes, never says no, never makes a counter offer.
You never hear from her!  So pay her price or keep searching every week.

There is another 314A  from a different seller for $78.33, that is not a good price!

Anything above about $20 for a 255A or any unsealed relay is too much - pass it up!
Unsealed relays need very careful adjustment.

.093  molex females need to be squashed down a tiny bit to fit on 255A or 314A pins..

Maybe someone can recommend a spark suppressor to put acoss the contacts.
.

Tom   N3CRK
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