[GreenKeys] Teletype clothing
Studio8H
mail at studio8h.com
Sun Nov 16 08:03:30 EST 2014
I would like one of the hats if they become available.
Dan Beach
KD4WLI
On Nov 16, 2014, at 12:37 AM, greenkeys-request at mailman.qth.net wrote:
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Today's Topics:
1. Teletype clothing (Don Robert House K9TTY)
2. Re: Teletype clothing
(Ed Sharpe Archivist for SMECC via GreenKeys)
3. Re: printing to KSR 28 was (John Nagle)
4. Re: Teletype clothing (Chuck)
----------------------------------------------------------------------
Message: 1
Date: Sat, 15 Nov 2014 22:48:06 -0600
From: Don Robert House K9TTY <62.5milliamps at gmail.com>
To: Greenkeys <greenkeys at mailman.qth.net>
Subject: [GreenKeys] Teletype clothing
Message-ID: <4DA7438C-7CE8-4937-9890-3881F82C7722 at gmail.com>
Content-Type: text/plain; charset="us-ascii"
Is there still any interest in these caps?
Just wondering
Don K9TTY
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Message: 2
Date: Sun, 16 Nov 2014 00:06:01 -0500
From: Ed Sharpe Archivist for SMECC via GreenKeys
<greenkeys at mailman.qth.net>
To: 62.5milliamps at gmail.com, greenkeys at mailman.qth.net
Subject: Re: [GreenKeys] Teletype clothing
Message-ID: <6e858.b084fe6.41998ab8 at aol.com>
Content-Type: text/plain; charset="us-ascii"
sure Don we would add one to the display!
Ed# _www.smecc.org_ (http://www.smecc.org)
In a message dated 11/15/2014 9:48:30 P.M. US Mountain Standard Time,
62.5milliamps at gmail.com writes:
Is there still any interest in these caps?
Just wondering
Don K9TTY
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Message: 3
Date: Sat, 15 Nov 2014 20:26:03 -0800
From: John Nagle <nagle at animats.com>
To: greenkeys at mailman.qth.net
Subject: Re: [GreenKeys] printing to KSR 28 was
Message-ID: <5468275B.7080300 at animats.com>
Content-Type: text/plain; charset=windows-1252; format=flowed
> Date: Fri, 14 Nov 2014 18:57:23 -0800
> From:epvgk at limpoc.com
> To: Jim Haynes<jhhaynes at earthlink.net>
> Cc: John Foust<jfoust at threedee.com>, Green Keys
> <greenkeys at mailman.qth.net>
> Subject: Re: [GreenKeys] printing to KSR 28 was Re: OT: Radio Shack
> near bankruptcy
> Message-ID:<20141115025723.GA26931 at limpoc.com>
> Content-Type: text/plain; charset=us-ascii
>
> On Fri, Nov 14, 2014 at 08:26:07PM -0600, Jim Haynes wrote:
>>> I'm not familiar with the Black Box things being offered, but there
>>> is this caution. Some 20/60 ma devices like Models 32, 33 and 35
>>> operate at low voltage, so the converter circuit is pretty simple.
>>> Models 15, 28, etc. normally operate with much higher voltage, so
>>> the converter has to be able to withstand the voltage.
>>>
>>> We used to use bipolar transistors like MJE-340 but then the "sold
>>> state relay" chips became available, offering both high voltage and
>>> optical isolation. I've attached someone's document on the subject;
>>> ask me by email if the attachment doesn't come through the system.
>>>
>>> Jim W6JVE
> Haha, I'm that someone.
> it's on my site athttp://heepy.net
I have a simple board 60mA loop design using an optoisolator here:
http://www.aetherltd.com/connecting.html
There are lots of optoisolators that work. The Omron
G3VM-401B, around $2 each, is known to work. I recommend
using some R/C snubbing as shown if you're using a Model 14
or 15; the inductive kick from the selector magnet can
be a few hundred volts, and has to go somewhere. The Omron optoisolator
can withstand 320V continuous.
Unless you want a polar relay for historical reasons,
don't bother.
This still requires a 120VDC supply and a 2K ballast
resistor. There are some more modern designs that generate
the 120VDC from 5VDC with a boost converter.
If you just need a 20mA current loop, buy a commercial
converter.
John Nagle
------------------------------
Message: 4
Date: Sat, 15 Nov 2014 21:37:15 -0800
From: "Chuck" <j-mcclurg at sbcglobal.net>
To: <greenkeys at mailman.qth.net>
Subject: Re: [GreenKeys] Teletype clothing
Message-ID: <003201d0015f$6191cb50$8f01a8c0 at communiceykom5>
Content-Type: text/plain; charset="iso-8859-1"
Yes Don I would like one......................................
Chuck
N7UVZ
----- Original Message -----
From: Ed Sharpe Archivist for SMECC via GreenKeys
To: 62.5milliamps at gmail.com ; greenkeys at mailman.qth.net
Sent: Saturday, November 15, 2014 9:06 PM
Subject: Re: [GreenKeys] Teletype clothing
sure Don we would add one to the display!
Ed# www.smecc.org
In a message dated 11/15/2014 9:48:30 P.M. US Mountain Standard Time, 62.5milliamps at gmail.com writes:
Is there still any interest in these caps?
Just wondering
Don K9TTY
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