[time-nuts] Wavecrest DTS 2070

Pete Lancashire pete at petelancashire.com
Mon Sep 9 16:58:13 EDT 2013


-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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