[GreenKeys] Notes on the ST-8000A connector

[Roy Morgan]

On Jun 28, 2009, at 8:39 PM, Stan Wilson wrote:...
> On the web there is a site that has the switch setting for use of  
> the unit
> with a FT-1000 MP.
>       Http://www.senie.com/dan/radio/st8000.html      N1JEB

A couple of notes on this post:

As Don Cunninham points out, that link above gives information for the  
ST-8000, not the ST-8000A.

> c)	I  interpret Table 2.3 in the manual to mean both the modulator
> input and demodulator output are transformers in the ST8000A.

A peek inside the ST-8000A here indicates to me that there are two  
transformers.  They are the same transformer but are mounted reversed  
from each other, indicating that one goesinta and one goesouta.


>  ..., but both are balanced and appear
> to be above ground.

I would expect that both have windings that are not connected to  
ground.  If you need/want to make a ground connection at the terminal  
unit, you'd have to do that intentionally.

> d)	 I am still confused on whether a single ST8000A can be used to
> convert baudot speeds.   i.e.   Can I receive 100 wpm baudot and  
> output 60
> wpm to my TTY machine, etc.  (??)

Converting UP speed can be done but not the reverse.  The 60 WPM  
character can produce a 100 WPM character that is done before the next  
60 WPM character comes along. The reverse won't work because "at  
speed" characters at 100 WPM each finish before a 60 WPM character  
could complete.

>
>
> So the adventure begins.    I will try to share what I learn and  
> hopefully
> others will also.

Indeed, we'll all be grateful for your reports.

Roy

Roy Morgan
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