[time-nuts] Wavecrest DTS 2070

Mon Sep 9 21:51:42 UTC 2013

Lethal was dropping a conductor across the buss bars. If it was not the -2V
it
was -5.2V. I can't remember but it was at least 75A more like 100A.

The power supplies were in the bottom of the cabinets and tin plated copper
buss bars would run up the side of the back planes.

The back planes where wire wrapped and we were suppose to shut the power off
when making a change.  A bit of 30 gauge wire didn't matter but a manual
wire wrap
tool made some pretty interesting sparks. That caused a fault.

Another had metal framed glasses. Did not even cause a hiccup to the test
program
that was running.

Ah the good days of CML, Current Mode Logic. at Burroughs.

-pete

On Mon, Sep 9, 2013 at 2:21 PM, Mark C. Stephens <marks at non-stop.com.au>wrote:

> Is 200 amperes @ 2v not lethal?
>
> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
> Behalf Of Pete Lancashire
> Sent: Tuesday, 10 September 2013 6:58 AM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] Wavecrest DTS 2070
>
> -2V is a common terminator voltage for ECL
>
> In my days before gray hair I worked on a machine that for each rack had a
> 200A -2V power supply, a fully configured system had over 20 racks.
>
>
>
>
> On Mon, Sep 9, 2013 at 1:19 PM, paul swed <paulswedb at gmail.com> wrote:
>
> > Just trying to figure out why a 2V power supply pretty curious.
> > Regards
> > Paul.
> >
> >
> > On Mon, Sep 9, 2013 at 3:57 PM, Ed Palmer <ed_palmer at sasktel.net> wrote:
> >
> > > I think there's lots of ECL in this thing.  In 2012, Richard H
> > > McCorkle said that US Patent #6226231 was for part of the DTS-2075.
> > > It shows lots of ECL.  My unit dates from around 2000 and doesn't
> > > have an obvious 3V3 supply, only 5V, 15V, and 24V.  One of the 5V
> > > supplies might be adjusted for 5V2 and wired for negative voltage.  I
> didn't check that.
> > >
> > > Ed
> > >
> > >
> > > On 9/9/2013 1:16 PM, paul swed wrote:
> > >
> > >> 2.1 volt hmm maybe they are doing something with ECL. Say the
> > >> common
> > logic
> > >> was 3.3 V adding a -2.1 would get you close to the 5.2V of ECL.
> > >> Though these look new enough that ECL should not be in the mix.
> > >> Regards
> > >> Paul
> > >> WB8TSL
> > >>
> > >>
> > >> On Mon, Sep 9, 2013 at 2:54 PM, Ed Palmer <ed_palmer at sasktel.net>
> > wrote:
> > >>
> > >>  Hi Marki,
> > >>>
> > >>>
> > >>> On 9/9/2013 12:15 PM, Mark C. Stephens wrote:
> > >>>
> > >>>  Amazing Ed, I just had a invasive discography last Thursday!
> > >>>> I have been a bit quiet because of a back injury too.
> > >>>>
> > >>>>  You're creeping me out Marki!
> > >>>
> > >>>
> > >>>   We must be living parallel lives, fortunately my telly is still
> > >>> good, my
> > >>>
> > >>>> 9 year old son has discovered Dr. Who so we are having great time
> > >>>> watching it :) Some of the original series are a hoot :) so
> > >>>> overdone but the Dalek's back then couldn't fly...
> > >>>>
> > >>>>  I remember watching it when it was new in the early '60's.  Scary.
> > >>>
> > >>>
> > >>>   Only 1000 for a crown, It would be cheaper for me to fly to
> > >>> Canada to get
> > >>>
> > >>>> crown
> > >>>> My last crown was disaster as a result the clown that put the
> > >>>> crown in stuffed up and the crown snapped off at the root So
> > >>>> added to the $2400 for the crown, I am now up for around 7K for
> > >>>> an implant.
> > >>>>
> > >>>>  Geez, I hope I don't follow in your footsteps!  Your 'parallel
> lives'
> > >>> comment now has me really worried.
> > >>>
> > >>>
> > >>>   The standby PSU tranny is dead short, zero ohm as compared to
> > >>> the
> > 2v/6A
> > >>>
> > >>>> supplies 8-10 ohm.
> > >>>> Any idea what that 2V supply is for?,
> > >>>>
> > >>>>  Sorry, no clue.  But my mainboard has a +2.1 volt test point so
> > there's
> > >>> certainly a 'family resemblance' between our units.  Mine must
> > >>> generate the
> > >>> +2.1 volts on the mainboard.
> > >>>
> > >>>
> > >>>   If I can lose the 2 linear PSU, I'll lose a ton of weight, but
> > possibly
> > >>>
> > >>>> at the expense of electrical noise.
> > >>>> I was thinking that is why they used optics between the control
> > >>>> board
> > -
> > >>>> to keep spurious noise to a minimum.
> > >>>>
> > >>>>  Yes, but I would have thought that optoisolators would have been
> > >>> cheaper
> > >>> than optical transmitters, receivers, and cables.
> > >>>
> > >>>
> > >>>   Yeah, I did play roulette by powering it up like that but I was
> > >>> a tad
> > >>>
> > >>>> annoyed as I was told it was a working unit.
> > >>>> The bottom board on this one has millions of tiny surface mount
> > >>>> caps mounted on there sides.
> > >>>> It looks terribly fragile. Much of a job to get it out?
> > >>>>
> > >>>>  Well, I described my process in the teardown.  Is your board
> similar?
> > >>>   Other than the front panel stuff, board removal is just a matter
> > >>> of unplugging connectors and unscrewing the mounting screws.
> > >>>
> > >>>
> > >>>   All the PSU screw heads are under it (of course) Yup.  I needed
> > >>> to get at the mounting screws for the cardcage so that I could
> > >>> inspect the motherboard.
> > >>>
> > >>> Ed
> > >>>
> > >>>
> > >>>   -----Original Message-----
> > >>>
> > >>>> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces@**fe**
> > bo.com<http://febo.com>
> > >>>> <time-nuts-bounces at febo.**com <time-nuts-bounces at febo.com>>]
> > >>>>
> > >>>> On Behalf Of Ed Palmer
> > >>>> Sent: Tuesday, 10 September 2013 1:53 AM
> > >>>> To: Discussion of precise time and frequency measurement
> > >>>> Subject: Re: [time-nuts] Wavecrest DTS 2070
> > >>>>
> > >>>> Sorry, the oracle is out of the office today - I'm the janitor.
> > >>>> :)
> > >>>>
> > >>>> I see you've already replaced the 24V supply and powered the unit
> up.
> >  I
> > >>>> would have removed all output connections on the supplies and
> > >>>> tested them seperately.  Are you sure about that transformer
> > >>>> short?  Remember that primaries on decent size line transformers
> > >>>> only have something ike
> > >>>> 2 to 4  ohms resistance at most.  I wondered why yours was 12 lbs
> > >>>> heavier than mine.  Linear supplies - that would do it!
> > >>>>
> > >>>> The expanded/exploded capacitors could be just from age, or they
> > >>>> could be from an output fault on the power supply that caused the
> > >>>> voltage to go high.  That's why I would have tested both power
> > >>>> supplies offline.
> > >>>>
> > >>>> You said it's alive, but you haven't mentioned if it actually works.
> > >>>>
> > >>>> By the way, it turns out that I paid dearly for my good luck with
> > >>>> the repair of my 2077.  In the two weeks following that, I got a
> > >>>> pinched nerve in my back that's still giving me trouble, I broke
> > >>>> a big chunk off a tooth and am now scheduled for a crown at a
> > >>>> cost of about $1000, and my big-screen TV died! :(
> > >>>>
> > >>>> Ed
> > >>>>
> > >>>>  ______________________________**_________________
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