[time-nuts] Wavecrest DTS 2070

Pete Lancashire pete at petelancashire.com
Mon Sep 9 23:08:33 UTC 2013


Somewhere in the depths of boxes (if no lost is a fire about 25 yrs ago)
are a few B7700, BSP and AFP boards that followed me home.
The  BCM chips my guess are now quite rare., Some of the boards have (had?)
Motorola ECL.

-pete







On Mon, Sep 9, 2013 at 3:42 PM, paul swed <paulswedb at gmail.com> wrote:

> You have some cml in the basement right?
> Regards
> Paul
>
>
> On Mon, Sep 9, 2013 at 5:51 PM, Pete Lancashire <pete at petelancashire.com
> >wrote:
>
> > 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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