[GreenKeys] ST-8000A and ST-6000 (was "More where these camefrom")
Richard Schumann
richardschumann at comcast.net
Thu Jun 4 23:03:11 EDT 2009
Thanks Don!
Richard kn7sfz
----- Original Message -----
From: "Don Cunningham" <wb5hak at martineer.net>
To: "Richard Schumann" <richardschumann at comcast.net>
Sent: Thursday, June 04, 2009 7:59 PM
Subject: Re: [GreenKeys] ST-8000A and ST-6000 (was "More where these
camefrom")
> The DT-600 was a Navy MARS project, by Garey Barrell, K4OAH and another
> guy that I have forgotten, that put all the boards of the ST-6 on one,
> double sided board. It was short lived, but was a VERY good TU if you can
> find one. There were some other boards, designed to work with the DT-600
> for answer back, etc., or at least planned, but I don't remember ever
> seeing them. I do have a DT-600 that I bought a few years back, but
> haven't tried it on the air. Not sure what happened to the original I
> build years ago that also had a UT-4 regenerative receiver in the same
> case, hi. Also, I don't remember what the ST stood for, unless it was
> short for Solid State TU, but Bill Henry can likely remember. All of the
> TU's that Irv Hoff designed had the designation "Mainline", as in Mainline
> ST-5, etc.
> 73,
> Don, WB5HAK
>
> By the way, Richard, the DT in the DT-600 was "Data Terminal", from my
> manual, hi.
> 73,
> Don, WB5HAK
> ----- Original Message -----
> From: "Richard Schumann" <richardschumann at comcast.net>
> To: "Greenkeys" <greenkeys at mailman.qth.net>
> Sent: Thursday, June 04, 2009 9:42 PM
> Subject: Re: [GreenKeys] ST-8000A and ST-6000 (was "More where these
> camefrom")
>
>
>> Coupla questions for anybody....
>>
>> For the ST-6, ST-6000, etc.,....what does the 'ST' stand for?
>>
>> And any ideas where the DT-600 fits in all of this....I suppose it had a
>> short life as not much mention is made of it.
>>
>> Richard kn7sfz
>>
>>
>> ----- Original Message -----
>> From: "Bill Henry" <ghenry at halcomm.com>
>> To: "Don Cunningham" <wb5hak at martineer.net>; "hsvham" <hsvham at yahoo.com>;
>> "Jeffrey Angus" <jangus at socal.rr.com>; <larryradio at att.net>; "Greenkeys"
>> <greenkeys at mailman.qth.net>; "Herb Graeber" <hhg at suddenlink.net>
>> Sent: Thursday, June 04, 2009 10:20 AM
>> Subject: Re: [GreenKeys] ST-8000A and ST-6000 (was "More where these came
>> from")
>>
>>
>>> Thanks for the kind words, guys.
>>> Here's a short time-line of RTTY modems by Irv Hoff, HAL, and Dovetron.
>>>
>>> Nov, 1964 RTTY Journal, Irv Hoof, K8DKC and Keith Peterson W8SDZ -
>>> "Mainline TT/L FSK Demodulator" (TT/L-1)
>>>
>>> Sept, 1967, HAL Devices RT-1 RTTY Demodulator.
>>> I designed the RT-1 for USAF MARS duty and it worked - but
>>> "I've had better ideas".
>>>
>>> Sept, 1967 RTTY Journal & May + June 1969 QST, Keith Peterson, W8SDZ,
>>> and Irv Hoff, K8DKC - TT/L-2 FSK Demodulator.
>>>
>>> Sept, 1968 RTTY Journal & April, 1970 QST, Irv Hoff, W6FFC -
>>> "Mainline ST-3 Solid State FSK Demodulator".
>>> It was about this time that Irv and HAL started
>>> communicating. We discussed offering the ST-3 but Irv wanted to wait
>>> until he finished the ST-6.
>>>
>>> May, 1970 RTTY Journal & Sept, 1970 Ham Radio, Irv Hoff, W6FFC - ST-5
>>> RTTY Demodulator
>>>
>>> Sept, Oct, Dec, 1970 RTTY Journal & Jan. 1971 Ham Radio, Irv Hoff,
>>> W6FFC - ST-6 RTTY Demodulator.
>>> HAL started supplying circuit boards for the ST-6 in
>>> September, 1970 and complete wired units by April, 1971.
>>>
>>> Sept, 1972, HAL ST-6000 RTTY Demodulator.
>>> The ST-6000 started out to be an ST-6 that didn't need
>>> toroids but grew into something that was quite different.
>>>
>>> Sept, 1973 (?), Hank Scharfe, W6SKC - Dovetron MPC-1000. I believe
>>> he first showed it at the 1974 Dayton Hamvention.
>>>
>>> April, 1977, HAL ST-5000, a lower-cost and reduced feature version of
>>> the ST-6000.
>>>
>>> April, 1984, ST-8000 HF Modem.
>>> This included all the bells and whistles I always wanted an
>>> a modem - and used some 1500 components (aka "labor intensive").
>>>
>>> Sept, 1990, HAL bid the ST-8000A in response to a USAF supply
>>> contract. The specifications were based on the Frederick 1280A/M
>>> Militarized Modem.
>>> In all, we shipped about 700 to the USAF by 1993. It now
>>> appears that many remained in their depot packing at McClellan AFB
>>> until it was closed. I've been told that some were then
>>> warehoused at Tinker AFB.
>>>
>>> After that, HAL switched to DSP technology - PCI-4000, DSP-4100/2K,
>>> P-38, DXP-38, etc. These modems use about 1/10 the parts of the ST
>>> series but are very software intensive. We traded manufacturing
>>> labor costs for software development costs - more expensive people
>>> and - as we all know - "software is never done".
>>>
>>> It would be interesting if one of the contributors could add-in
>>> models and dates for Frederick modems. Many predated HAL by quite a few
>>> years.
>>>
>>> Bill Henry
>>>
>>> PS: The TT/L-2 was a great demodulator. Some of the parts were
>>> very hard to find but once found and built, the demod had a VERY deep
>>> dynamic range. The filters in the later ST-series were generally
>>> better but we gained a lot of satisfaction seeing all those "valves"
>>> light up (also heat for the shack).
>>>
>>>
>>> At 06:46 PM 6/3/2009 -0500, Don Cunningham wrote:
>>>>One word to the wise, replacing ST-6000's with the ST-8000A. Listen to
>>>>what
>>>>Bill Henry and others are saying. This TU was designed to fullfill a
>>>>government contract, required to be "like" another brand of TU. The
>>>>ST-6000A is a FINE RTTY TU, designed for 60 and 100 wpm RTTY, with built
>>>>in
>>>>loop supply and tuning scope. I have most of Hal's units by now, but
>>>>consider the ST-6000 to be probably the "pinnacle" of their design for
>>>>amateur RTTY (maybe if my ST-8000 (non A model) wasn't such a basket
>>>>case,
>>>>I
>>>>would think it was better, hi)!! Just MHO, but I bought a new ST-6000
>>>>for
>>>>myself upon retirement, that was a special commercial low tone unit, and
>>>>it
>>>>far outdistances ANY other TU I own. I have the ST-8000, ST-8000A (NIB
>>>>one,
>>>>so I paid a LOT more for it, hi), several ST-6000's and ST-6's. All do
>>>>what
>>>>they were designed to do, just don't expect the last to be the best for
>>>>amateur use. If I'm wrong, some of you straighten me out, but in my
>>>>shack,
>>>>I'll never get rid of my ST-6000. Off the soapbox, hi.
>>>>73,
>>>>Don, WB5HAK
>>>>
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