Fwd: Re: [GreenKeys] different ST-6s?

[Don Robert House]

Thanks to Bill Henry for his enlightenment.  I know I have three 
ST-6s and they are all different.

Don


>>Date: Tue, 26 Apr 2005 09:18:06 -0500
>>From: Bill Henry <ghenry at halcomm.com>
>>Subject: Re: [GreenKeys] different HAL ST-6;s?
>>,
>>
>>There are several different "flavors" of the ST-6 and not all came 
>>from HAL.  Irv first had ST-6 boards made by a fellow in North 
>>Carolina.  These were sold as circuit boards only and each ham made 
>>up his own cabinet.  Then Irv came to HAL Devices and at first we 
>>provided only circuit boards but they were of our own design - not 
>>Irv's PCB design.  Also, early HAL sales were only of boards and 
>>parts.  We then developed the cabinet and offered it, first as kits 
>>and then as wired units.  The rear panel changed during the life of 
>>the ST-6.  Early cabinets had an insulated 1/4" phone jacks for the 
>>loop connections.  But, this could pose a shock hazard so later 
>>ST-6 cabinets used a 6-pin plastic connector (by Molex).  Use of 
>>Molex connectors continued when we brought out the ST-6000.  In 
>>regard to how many boards were in the cabinet, that also varied. 
>>The basic HAL ST-6 supported 170 and 850 Hz shifts and had two 
>>input filter boards (3x6"), two discriminator boards (3x3"), LP 
>>filter and slicer board (3x3"), one autostart board (3"x6"), one 
>>power supply board (3x6"), and one Meter/Lamp driver board (1x2"). 
>>We also provided two board slots for optional features. One slot 
>>was for the AFSK oscillator board (3x6").  This was the AK-1 in 
>>early units and then became the crystal-controlled XTK-100 in later 
>>units.  Either AFSK oscillator can be plugged into this slot (far 
>>left).  The other option slot was for a 3rd shift discriminator 
>>board (3x3") for reception of commercial 425 Hz shift RTTY signals. 
>>Later factory wired ST-6 cabinets had wired connectors for all 
>>options.   You are correct that the AC outlet on the rear panel was 
>>for autostart control of the printer motor.
>>
>>HAL ST-6 sales tapered off in 1976 when we introduced the ST-6000. 
>>The ST-6000 has a basic block diagram similar to the ST-6 but does 
>>not use toroids, has more advanced op-amp filters, a scope, and 
>>quite a few other features.
>>
>>There were several other variants of the ST-6 that were not offered 
>>by HAL, including one called the "ST-600" which was one large 
>>circuit board designed by NAVY MARS members.  I believe it was a 
>>single shift version (170 Hz).
>>
>>No doubt this is more than you wanted to know!
>>
>>73,     Bill Henry, K9GWT
>>
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>George W. (Bill) Henry		Internet: ghenry at halcomm.com
>President			WWW:	  halcomm.com
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