[GreenKeys] Information on Extel Printer.

[Charles Ring]

On 5/28/2013 0558, Sheldon Daitch wrote:
>   I am going to go out on a limb, as I am having to go from memory of things I knew more about, roughly 30 years ago.
>
> If the Extel printer had an RCA logo on it, it was probably in UPI use.  UPI used RCA Service to maintain their equipment, while the AP tended to use in-house technical staff to keep their machines working.
>
> The print head is seven pin, with a small electromagnet to drive that pin to print the portions of the completed printed item, as the print head stepped across the paper.
>
> Any possibility the model is an AH-11R?
>
> The AP Extels were generally loop current driven, as the AP had numerous Lenkurt 25A stand-alone single channel VF demodulators.
>
> The UPI Extels were generally outfitted with a tone demodulator which was installed in the Extel case.
>
> Was this always the configuration?  Don't know.  Might have been what the AP or the UPI had on hand when a subscriber had an Extel installed.
>

The two stations I worked at had 60 mA loop current Extels with Lenkurt 
25A's on UPI. They were so unreliable that both stations asked for and 
got Teletype 15ROs as backups. They were wired in series with the Extels.

-- 
*Charles Ring W3NU*
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