[GreenKeys] How to use a Data-Tek 9600 for Model 15 Testing

[Steve Ripper]

Dave:

Thank you the insight into setting up and using the Data-Tek 9600. I have
fully restored my 9600 and it is ready to go. I too have a model 15 I have
yet to fire up and your information on the settings will make the process
much easier. 

Cheers,
 
Steve Ripper
steveripper at comcast.net
Mobile: 248-787-0705

-----Original Message-----
From: greenkeys-bounces at mailman.qth.net
[mailto:greenkeys-bounces at mailman.qth.net] On Behalf Of Dave Hunter
Sent: Tuesday, August 09, 2011 8:23 PM
To: Greenkeys at mailman.qth.net
Subject: [GreenKeys] How to use a Data-Tek 9600 for Model 15 Testing

Ho All:

I will do my best to explain this...

The first thing one must do is set the Data-Tek for the 
loop current of the machine under test..

>From the manual, page 5-4:

Loop Curent Adjustment

Loop Current Adjustment is achieved by using the Analyzer 
LOOP ma meter.

1 Set Generator to ASCII Mode, MK

2 Set Interface Sigs Out path to Tip+ and Sigs In path to 
Tip, then set Analyzer to Loop in ma.

3 Insert Tip-sleeve type patch cord from LOOP IN to LOOP 
Out. Read ma meter.

4. Using a mall screwdriver, adjust 20, 60 ma pot (thru 
Panel) for correct reading on meter.

Now, for the meat of this message...

These are the settings I used to feed and check my Model 
15, and print out using the built-in Fox message from the 
machine:

Loop Out - set to Tip+, Sigs Out. Loop Current 60 ma. set 
as above.

Mode: Set to Baudot, Cont.

Sigs Out Generator - Set to Center Position of top 3 way 
switch, all other switches off.

Parity off (for Baudot machines - needed for Ascii 
machines)

Code Lever Stop: [5] - 2.0

Bit Rate for 60 WPM machines, 45.5 Baud

Bias Switch to Loop IN

20/60/Polar switch to 60 (ma)

Plug machine into One of the Loop Out jacks. Set Step 
Switch to CONT, and watch your machine print out the Quick 
Brown Fox Message.

Now if testing a faster machine set baud rate to the one 
applicable.

To test an ASCII machine, you need to set it to ASCII at 
the correct speed. and loop current (20 for most ASR-33's).

Stop and parity must also be set properly..

One of the great features of these machines is to check a 
machine with a distorted signal, giving an idea what sort 
of distortion it can operate under.  This can be done using 
the Distorttion switch which can be set for MB [mark bias], 
SB [Late transition Space Bias]. of SWB [alternates on 
character basis.

Then using the % control, select the degree of distortion 
on the leading edge of each space bit [Bias]

The Higher it can be set, the more tolerant your machine is 
to external distortion of the signal it is being few - 
overall the quality of the machine's settings.

I hope this is understandable. It is the best I can do at 
this point for those with Data-Tek 9600's they would love 
to use.

I found it a very valuable tool as I restored this Model 
15.

One note: as we found out while working on the machine, the 
Data-Tek doesn't send a CR LF LTRS LTRS so there
is not enough time for the CARRIAGE to return at the end of 
the line, which may result in an off doubling of characters 
at the end of the line. 

Dave

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