[hpsdr] Tapr hombrew hermes shutdown problem

[Oliver Goldenstein]

Many thanks Phil! Shame on me. The first time i read about multifuses and i
always checked for continiuty. Oh man. But good to know.

The rest of the wonder is why the setup worked before.

73 Oliver DL6 KBG
Am 19.02.2013 08:38 schrieb "Phil Harman" <phil at pharman.org>:

> Hi Oliver,
>
> The current from the 13.8v supply at 0.7A is about right.  The current
> from a 5v supply will be higher since you use the current advantage of the
> SMPSU. But the power drawn will be much the same i.e.
>
> 13.8v x 0.7A   = 9.66W
>
> 5v x 1.93A      = 9.66W
>
> I'm sure you will find with the 2A fuse all will be well.
>
> 73 Phil....
>
>
> > Hi Phil !
> >
> > You are right. The BOM says 2 A but i checked what i have ordered and
> they
> > are 1.10 A.
> >
> > U did another test this morning powering rhe 5 V Bus from an external
> > power
> > supply.
> >
> > The voltage on the power supply decreased to 3.8 Volt 1.4 A!
> >
> > With powering from one 13.8 Voltvpower supply  i have around 0.7 to 0.8
> A.
> > And after the shutdown 0.3 A.
> >
> > I am confused.
> >
> > 73 Oliver
> > Am 19.02.2013 06:47 schrieb "Oliver Goldenstein" <
> > oliver.goldenstein at gmail.com>:
> >
> >> Hi Phil !
> >>
> >> The Fuses are the 2 A ones and they are ok.
> >>
> >> 73 Oliver DL6KBG
> >> Am 19.02.2013 02:07 schrieb "Phil Harman" <phil at pharman.org>:
> >>
> >>> Hi Oliver,
> >>>
> >>> Check F3, on early BOMs it was 1A but was increased to 2A on later
> >>> versions.
> >>>
> >>> 73 Phil..VK6APH
> >>>
> >>>
> >>>
> >>>
> >>> > ***** High Performance Software Defined Radio Discussion List *****
> >>> >
> >>> > Hi All !
> >>> >
> >>> > I am having a problem since sunday. I am not making progress in
> >>> debugging
> >>> > the error. Hermes ran nearly the whole weekend during the contest.
> >>> The
> >>> > enclosure was warm but not hot.
> >>> >
> >>> > The problem:
> >>> >
> >>> > The board starts fine es every time and i can run it for lets say
> >>> one
> >>> > minute with cuSDR64, ghpsdr3. After the minute the leds are only
> >>> showing
> >>> > half of the light than before. the board is then no more reachable
> >>> and
> >>> > cannot be discovered. When i start the board  in bootloader mode
> >>> > everything
> >>> > is normal. When i remove the jumper and powercycle the board it runs
> >>> also
> >>> > fine just to the time i put the networkcable in. it seems that
> >>> network
> >>> > traffic can speed up that failure.
> >>> >
> >>> > I measured as follows:
> >>> >
> >>> > U18, PIN3 = 13,6 Volt
> >>> > U18, PIN2 = 11,9 Volt
> >>> >
> >>> > in normal operation and after shutdown.
> >>> >
> >>> > The SMPS 5V output shows 4,96 V also in normal conditions and after
> >>> the
> >>> > shutdown (measured at L32). So i think the 12V and 5V Buses are ok ?!
> >>> >
> >>> > Now i measured at C153 and C174 and the input Pin of the LTC1529.
> >>> During
> >>> > the normal operation i have 4,45 Volt there. During the minute until
> >>> the
> >>> > shutdown the Voltage decreases down to 2,83 Volt in 0,01 Volt steps.
> >>> The
> >>> > last steps are faster.
> >>> >
> >>> > When i understand the schematics right i should have the same voltage
> >>> at
> >>> > the end of L32 and at C153.
> >>> >
> >>> > This must be something serious or silly. I hope the last one.
> >>> >
> >>> > In bootloader mode i am able to program and successfully reprogrammed
> >>> the
> >>> > board back to 2.2 which results in the same behaviour.
> >>> >
> >>> > 73 Oliver DL6KBG
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> >
>
>
>
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