[GreenKeys] Can't stop getting old TUs

[Jeff Stai]

Don't be afraid to contact HAL directly if you're having trouble finding
docs or parts. They have been very helpful finding a couple things I needed
to get my ST8000s back up and running.

I concur with Paul that getting them running is a lot of fun! But I also
like running them, then I know they're good.

73 jeff wk6i

On Fri, Jul 27, 2018 at 4:08 PM, David I. Emery <die at dieconsulting.com>
wrote:

> On Fri, Jul 27, 2018 at 01:25:45PM -0700, Pete Lancashire wrote:
> > Pulled my HAL ST-8000A out of storage, need the power connector (have
> them
> > but cant find yet, will pay  a good price to speed things up)
> >
> > Will soon get a Frederick 1280A. Does  not power up but no burnt boards
> or
> > smell. Anyone have the schematic of the power supply.
>
>         I have the entire (nsg.com version) of the 1280A manual EXCEPT
> for the AC PS schematic.  I think they are a known weakness, and maybe
> they wanted to keep the repair revenue for themselves.
>
>         I DO have a parts list and some info about what manufacturer
> part numbers were for the AC PS parts (in a 1280 rather than 1280A
> manual) and a board layout, and outline drawing - but no schematic.
> That page was missing from my manual copy.   It is listed in the index.
>
>         I'm interested - from an engineering history standpoint - in
> finding a schematic and block diagram of the ST-8000A as I'm quite
> curious as to how similar the actual analog demod circuits and filters
> are between the two designs.
>
>         As I understand it Fredrick designed the 1280 some time in the
> late 1970s or very early 80s in response to a "military" contract
> request.. (probably for NSA sigint systems) and some number of them were
> made and shipped and either stored in warehouses or put in service in
> systems during the eighties.
>
>         And apparent the same basic spec was put out for another bid
> around 1990 soliciting alternate suppliers - and HAL developed the
> ST-8000A based on both the 1280A and the ST-8000 to meet that contract
> (and supposedly about 730 or so of those boxes were made and many just
> warehoused and eventually surplussed).   One requirement of the second
> contract was drop in compatibility with the 1280A as I understand it so
> there are many similarities.
>
>         At one time I had a ST-8000A manual somewhere in .pdf form but I
> can't find it... and the recent greenkeys discussion of the two boxes
> has got me curious as to how much and in what way they differ in respect
> to the actual demod architecture, filters, and overall performance on
> typical HF signals.
>
>         There are, of course some control panel user interface
> differences.
>
> --
>   Dave Emery N1PRE/AE, die at dieconsulting.com  DIE Consulting, Weston,
> Mass 02493
> "An empty zombie mind with a forlorn barely readable weatherbeaten
> 'For Rent' sign still vainly flapping outside on the weed encrusted pole -
> in
> celebration of what could have been, but wasn't and is not to be now
> either."
>
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-- 
Jeff Stai ~ wk6i.jeff at gmail.com
Twisted Oak Winery ~ http://www.twistedoak.com/
Facebook ~ http://www.facebook.com/twistedoak
RTTY op at W7RN
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