[GreenKeys] ID Relay 35 ASR

[w9ddd at tapr.org]

John, W9DDD

Ah yes, wire wrap connections, I remember them well.

> On Jun 9, 2019, at 8:41 PM, Ralph Irish <w8roi at wowway.com> wrote:
> 
> Ken
> 
> Be extra careful with that relay.  They are rugged, in place, with little or no vibration.  If they
> are slightly mishandled, some of the contacts can jump out of position and prevent operation or 
> cause wires to be connected which should not be.
> 
> These are called Wire Spring Relays, and it is not the typical relay operation.  It is the one or
> two 'poles' which move, not the 'common'.  The contacts move back and forth, on the outsides, and
> the center contact remains still.  Almost opposite of most other relays.  This action provides a
> small amount of 'wiping' of both contacts and promotes long life and long, sure operation.
> 
> In decades past, some Central Offices were run almost entirely on these relays.  When the Crossbar
> Relay came about, the 'count' of Wire Spring relays dropped, but was not eliminated until the
> advent of the various forms of "ESS" systems.  (Electronic Switching Systems)  
> 
> Wire spring relays continued on in various sub-assemblies and were commonplace in advanced Teletype
> systems.  I don't know when they were taken out of production.  I suspect that other than  in some
> dark corner of a warehouse, somewhere, there are no more 'new' Wire Spring Relays to be had.  
> 
> With power off, once the assembly is placed in the Teletype, carefully work the black plastic parts
> of the relay to visually inspect for unimpaired movement and good contact and clean breaking of the
> opening side.
> 
> Have fun!
> 
> 73,
> 
> Ralph -W8ROI
> 
> PS   I'm attaching a few photos of something I put together a few years back using
>      these relays and a standard mounting plate.  Each relay 'frame' holds two
>      complete relays.  Note four leads from each relay going to coils.
> 
> <IMG_0645.JPG>
> 
> 
> <IMG_0647.JPG>
> 
> Gently moving the black fiber items will provide manual operation of the
> relay and confirm that 'all is well' and good electrical operation should
> follow.
> 
> If good movement and operation is not seen, you must carefully remove
> the clear plastic cover and  VERY  carefully move things with a delicate
> touch to restore things.
> 
> 
> <IMG_0649.JPG>
> 
> 
> 
> 
> -   -   -   -   -   -   -   -
> 
> 
>> On Jun 9, 2019, at 12:48 PM, Ken Wiebe wrote:
>> 
>> This relay (see pic) seems important.  Line local relay?
>> 
>> I only have one of these and it's disconnected in a cardboard box.  The only marking is CARD 334090 and it does in fact have card 334090 in it.  I didn't find this part number in the parts list anywhere.
>> 
>> If this is the line local relay, I wonder why the thing works at all without it.  Purely speculation, but maybe it has been bypassed?
>> 
>> My 35 has Offline/Line/Unattended modes.  Offline is off.  The motor runs and the printer prints when the mode switch is set to either Line or Unattended.
>> 
>> My current goal is to get a full duplex signal line hooked up and get the 35 talking on the line to an RS-232 device.  So if anyone can give me like a checklist of what electrical components I need to confirm on the 35 that would be helpful and appreciated.
>> 
>> I have built the current loop/RS-232 circuit but I am also having trouble finding the full duplex pins 5-8 on the ASR so, there's that...the circuit isn't much good with no place to connect it.  Arghhh.
>> 
>> Ken
>> 
>> 
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