[GreenKeys] Dataspeed machines...

[Don Robert House]

Yes David,

202 Type sets were used with the Type 2.
The Type 4 was only used briefly 8 level 1800 - 2000 Bps with error  
correction.
The Type 5 was used extensively again 8 Level both machines used the  
DRPE
punch, whereas the Type 2 used the BRPE punch.

On the senders the Type 2 used a CX reader as did the Type 5.
The Type 4 used a DX reader.

I have a photo of these machines (except the Type 4) here somewhere.   
I had
all of them in my data test center.  We could not afford a Type 4  
system as
they were extremely expensive.

Best,
Don
K9TTY




On 9 Mar 2010, at 9:59 PM, David I. Emery wrote:

On Tue, Mar 09, 2010 at 09:10:55PM -0600, Don Robert House wrote:
>
> As luck would have it I was given the job of designing the last Type 2
> installation at Paddock Publications (now the Herald) in Arlington  
> Hts.
> Illinois when I was in the circuit provisioning center.  Somewhere  
> here
> I have a copy of my design.  The AP machines were interesting as
> they came with a special controller with options for different types  
> of
> news.

	The actual wire signal was 202 type AFSK (similar to packet)
ASCII at 1200 baud... with a micro based controller that filtered out
the desired news based on various message headers and codes.

>
> The most fun however was the Type 4 & 5 with discrete coding
> and error detection and correction, but that is another story.

	That must have come later... or not been used by the AP....



-- 
  Dave Emery N1PRE/AE, die at dieconsulting.com  DIE Consulting, Weston,  
Mass 02493
"An empty zombie mind with a forlorn barely readable weatherbeaten
'For Rent' sign still vainly flapping outside on the weed encrusted  
pole - in
celebration of what could have been, but wasn't and is not to be now  
either."