[time-nuts] Wavecrest DTS 2070

paul swed paulswedb at gmail.com
Mon Sep 9 16:19:12 EDT 2013


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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