[GreenKeys] Interesting modem for a teletype up on eBay

[Paul Heller]

Wow, nice restoration job. It is funny to see an O with the slash and a ZERO without the slash. I suddenly remember that this is the exact opposite of what I learned way back in engineering school.

Paul
KD0DFR

On Feb 13, 2011, at 2:09 PM, Chris Elmquist wrote:

> I offered that I'd send a few pictures of my Anderson-Jacobson branded
> model 33 with internal acoustic coupler so here they are,
> 
> https://picasaweb.google.com/117891262011490779403/AndersonJacobsonModel33Teletype?authkey=Gv1sRgCOOcsIee0934eA&feat=directlink
> 
> You can also see the slashed-oh and unslashed-zero on the keyboard which
> is a little unique I think.
> 
> I didn't see that configuration in a recent document that went around
> showing which companies certain keyboards were built for.
> 
> Sadly, when I got this machine, it had been stashed in a basement
> where the owner kept some kind of pet birds.  The birds had
> decided that this M33 was a great place to dump...  you know...
> dump everything... including sticks, feathers, seeds, stones... both
> before and after consuming said items.  The inside of the machine was
> a disaster.  They also pecked at the rubber cups on the acoustic coupler
> and so those are a little beat up with divots all over them.  Sigh.
> 
> Was a lot of work to clean it up and was my first complete tear down
> and rebuild of a '33.   But it works FB now including punch and reader!
> UV has gotten the best of the keyboard and there's a big patch on the lid
> where a giant decal had been that caused that area to age differently...
> but I guess we call all that patina right? Plastic patina?  :-)
> 
> Chris N0JCF
> 
> On Wednesday (02/02/2011 at 09:30AM -0600), Chris Elmquist wrote:
>> Sorry-- I meant to comment on the modem modulation too...
>> 
>> The unit I have is most definitely a Bell 103 originate modem.  110 or
>> 300 baud intended for originating the call to a timeshare service
>> such as John describes.
>> 
>> A 103 originate modem transmits with 1270/1070 mark/space tones and
>> receives 2225/2025 while the answer modem obviously does the reverse.
>> 
>> ie,
>> http://en.wikipedia.org/wiki/Bell_103_modem
>> 
>> Chris N0JCF
>> 
>> On Wednesday (02/02/2011 at 09:24AM -0600), Chris Elmquist wrote:
>>> On Wednesday (02/02/2011 at 08:04AM -0600), John Foust wrote:
>>>> At 12:10 AM 2/2/2011, Christian Gauger-Cosgrove wrote:
>>>>> I find it most interesting because it appears as though it is designed
>>>>> to replace the right-hand cover panel of a Model 33 or Model 32. 
>>>>> Quite ingenious if you ask me.
>>>> 
>>>> Seems quite normal to my USA Midwestern computer-geek eyes.  Several of 
>>>> the first 33s I used were like this.  300 baud to DEC time-sharing systems
>>>> in the mid-70s.
>>>> 
>>>> 1200 baud wasn't commonly available to consumers until, what, 1984?
>>> 
>>> I have a '33 that was rebranded as an Anderson-Jacobson unit and has
>>> an AJ acoustic coupler built into the right-hand cover panel just as
>>> you describe.
>>> 
>>> The modem plugs into the 20mA loop at the Molex connector bank at the
>>> back of the '33 with a single connector and gets power and transmit
>>> and receive loop over that single connection.
>>> 
>>> The LOCAL / LINE switch was relocated to the panel of this modem and
>>> then the front plate (below the keyboard) of the '33 has no hole where
>>> the local/line switch would normally be located.  That plate is then
>>> logo'd with the Anderson-Jacobson "waveform" logo and the 33's lid over
>>> the typing mechanism has an AJ decal stuck over where the Teletype logo
>>> is normally found.
>>> 
>>> This '33 also has a slashed-oh on the keyboard and typewheel--  as
>>> opposed to the more common slashed-zero.
>>> 
>>> I'll take a couple pictures and send them to the list as soon as I can.
>>> 
>>> Chris N0JCF
>>> 
>>> -- 
>>> Chris Elmquist
>>> 
>> 
>> -- 
>> Chris Elmquist
>> 
> 
> -- 
> Chris Elmquist
> 
> ______________________________________________________________
> GreenKeys mailing list
> Home: http://mailman.qth.net/mailman/listinfo/greenkeys
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:GreenKeys at mailman.qth.net
> 
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html