[time-nuts] Robert G8RPI -- Odetics 325 PSU
Roy Phillips
phill.r1 at btinternet.com
Sat Apr 19 18:34:18 UTC 2008
Robert
Thanks for your comments on the PSU, and I would certainly agree with you
that they are nasty beasts to work on, and I cannot find a faulty component
yet ! But I am fortunate in having been offered another 325, this I will
have to wait for, but in the meanwhile I have a brand new (different
manufacturer) SMPS to hand, and will use this in the short term. I had
thought that to maintain the "support" DC supply circuitry that is part of
the original PSU, was a good idea, as my Ball/Efratom Rubidium has its own
24 volt support system - but this could obviously be achieved another way.
I must say the 325 had begun to settle down and perform very well - I still
think that its a worthwhile unit.
Best regards
Roy
----- Original Message -----
From: "Robert Atkinson" <robert8rpi at yahoo.co.uk>
To: "Discussion of precise time and frequency measurement"
<time-nuts at febo.com>
Sent: Saturday, April 19, 2008 7:04 PM
Subject: Re: [time-nuts] Robert G8RPI -- Odetics 325 PSU
> Hi Roy,
> I've looked at two of these PSU's that had failed and was unable to
> repair either of them. (I'm a professional electronics engineer and can
> fix most things) There were no obvious faults like leaking capacitors or
> burnt up components. The topology of the auto-switching between 28V DC
> and 115/230V AC is not obvious and the PCB is very densely packed making
> it very hard to trace the circuit or make measurements. The high voltage
> on the PCB makes it hazardous to work on. I gave up and replaced them with
> a standard mains input multi-output unit. I don't recall the voltages and
> ratings (they were marked on the unit), but if you let me know what they
> are I'll see if I have a suitable unit. email robert8rpi (at) yahoo.co.uk
>
> Regards,
>
> Robert G8RPI.
>
> Roy Phillips <phill.r1 at btinternet.com> wrote:
> Hi Robert
>
> You may remember that we exchange info on the 325 SatSyc Receivers. I
> remember that you said that the PSU was a weak point with the system - you
> were right on , after finding a suitable antenna and replacing the lithium
> battery in the Rx., it was running sweetly for about 18 days, but
> yesterday it failed. The power fuse (AC input) had blown, and following a
> quick inspection within the PSU - nothing appears to be burnt out or
> visibly damaged. What was your experiece of fault finding with this item.
> Before I proceed further, do you have the schematic for the PSU - this is
> not in the normal manual - its an AC to DC, and a DC to DC unit. Its a
> quality item, Model VF100 -494-10/CX ,made by "Converter Concepts", and
> should be worth restoration. Any ideas ?
>
> cheers
>
> Roy UP
>
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