[hpsdr] Tapr hombrew hermes shutdown problem

[Oliver Goldenstein]

ok i identified on two boards i found on the net, that they have a "b 0300
bel fuse" installed which has a hold current of 3 A and a trip current of 5
A.

i will try one of those tonight.

73 Oliver
Am 19.02.2013 10:23 schrieb "Oliver Goldenstein" <
oliver.goldenstein at gmail.com>:

> I read more about the PTC Fuses and i checked my ordered fuses.
>
> they are all MF-MSMF110/16 which have a holding current of 1.10 Ampere and
> a trip current of 2.20 Ampere.
>
> Phil is it right. that the fuse must have a hold current of 2 Ampere?
>
> 73 Oliver DL6KBG
> Am 19.02.2013 08:55 schrieb "Oliver Goldenstein" <
> oliver.goldenstein at gmail.com>:
>
>> 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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