[GreenKeys] More where that one came from

[Herb Graeber]

Thanks Bill!  I just printed your message and placed it
in the Operator's Manual binder.  I'll make these changes
to the "used" ST-8000A this weekend and see how things
work.  Incidentally, I am using the RS-232 out to drive the
DSRTTY and using the MIL-188 out to drive the Model
28 through the old RS2100.  Also, just using TXD from
DSRTTY to key FSK through a simple open collector
NPN.  Thanks again.  73...Herb K5HG

----- Original Message ----- 
From: "Bill Henry" <ghenry at halcomm.com>
To: "Herb Graeber" <hhg at suddenlink.net>; "Jeffrey Angus" 
<jangus at socal.rr.com>; <larryradio at att.net>; "Greenkeys" 
<greenkeys at mailman.qth.net>
Sent: Wednesday, June 03, 2009 3:12 PM
Subject: Re: [GreenKeys] More where that one came from


> Herb - and all,
>
> The AMH times were dictated by USAF spec. to match those used in the 
> Frederick 1280A/M modem.  It has been a long time since I designed the 
> ST-8000A (1990) - but - circuit pot R56 (on the lower modem board) is the 
> calibration adjustment for AMH delay.  Mark the factory setting of R56 
> before changing it if you want to be able to get back to where you 
> started.  Fixed resistor R8 (68.1K) sets the delay for the smallest 
> increment to 1.0 second (SW2-8=ON).  Setting all sections of SW2 to ON 
> should reduce the time to 1/2 second or maybe less.  Also, paralleling 
> resistor R9 (274K) with a lower value will reduce the time for all 
> settings of SW2 (try maybe 24K).
>
> Good luck, and have fun.
>
> Bill Henry
>
> At 02:45 PM 6/3/2009 -0500, Herb Graeber wrote:
>>Thanks Jeffrey.  I've got two of those rascals.  One is
>>NIB and the other was used.  I modified the used one
>>like Jack (K0TTY) did except that I installed a Rat
>>Shack 8 conductor phono jack on standoffs over the
>>ventilation holes in the back left top corner.and ran the
>>cables through the hole where the diversity female was.
>>
>>I bought DSRTTY and am happy with the ST-8000A with
>>the exception of the Automatic Mark Hold (AMH) and the
>>time delay for it to change to the Mark-hold state.  The AMH
>>setting is internal and if the audio level changes any than the
>>ST-8000A starts printing garbage.  AND, why only a minium
>>of 1 second delay?  Thats 4 or 5 garbage characters when-
>>ever you get a LOS.  Sure would like to see a level control
>>and a threshold control on the front panel.  Oh well...
>>
>>73...Herb K5HG
>>
>>
>>----- Original Message -----
>>From: "Jeffrey Angus" <jangus at socal.rr.com>
>>To: "Herb Graeber" <hhg at suddenlink.net>; <larryradio at att.net>; "Greenkeys"
>><greenkeys at mailman.qth.net>
>>Sent: Wednesday, June 03, 2009 2:25 PM
>>Subject: Re: [GreenKeys] More where that one came from
>>
>>
>> >
>> >> Are these new or "refurbished"?  Did it come with
>> >> the manual and the amphenol male connectors?
>> >> I got one sealed, new in the box, like the government
>> >> bought it with all the accessories and manual but I
>> >> paid more than $79.00.  :>(
>> >
>> > I can't speak for the others on sale now, but the one I bought
>> > came reboxed and looked like it was just pulled out of service.
>> > IEEE power cord, and the data and audio connetors with
>> > the cables cut off at about 12"
>> >
>> > All things considered, with what they cost new, it was an
>> > exceptionally good deal.
>> >
>> > Jeff-1.0
>> > wa6fwi
>> >
>> >
>>
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>