<p dir="ltr">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.</p>
<p dir="ltr">i will try one of those tonight.</p>
<p dir="ltr">73 Oliver</p>
<div class="gmail_quote">Am 19.02.2013 10:23 schrieb "Oliver Goldenstein" <<a href="mailto:oliver.goldenstein@gmail.com">oliver.goldenstein@gmail.com</a>>:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<p dir="ltr">I read more about the PTC Fuses and i checked my ordered fuses.</p>
<p dir="ltr">they are all MF-MSMF110/16 which have a holding current of 1.10 Ampere and a trip current of 2.20 Ampere.</p>
<p dir="ltr">Phil is it right. that the fuse must have a hold current of 2 Ampere?</p>
<p dir="ltr">73 Oliver DL6KBG</p>
<div class="gmail_quote">Am 19.02.2013 08:55 schrieb "Oliver Goldenstein" <<a href="mailto:oliver.goldenstein@gmail.com" target="_blank">oliver.goldenstein@gmail.com</a>>:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<p dir="ltr">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.</p>
<p dir="ltr">The rest of the wonder is why the setup worked before. </p>
<p dir="ltr">73 Oliver DL6 KBG</p>
<div class="gmail_quote">Am 19.02.2013 08:38 schrieb "Phil Harman" <<a href="mailto:phil@pharman.org" target="_blank">phil@pharman.org</a>>:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Hi Oliver,<br>
<br>
The current from the 13.8v supply at 0.7A is about right. The current<br>
from a 5v supply will be higher since you use the current advantage of the<br>
SMPSU. But the power drawn will be much the same i.e.<br>
<br>
13.8v x 0.7A = 9.66W<br>
<br>
5v x 1.93A = 9.66W<br>
<br>
I'm sure you will find with the 2A fuse all will be well.<br>
<br>
73 Phil....<br>
<br>
<br>
> Hi Phil !<br>
><br>
> You are right. The BOM says 2 A but i checked what i have ordered and they<br>
> are 1.10 A.<br>
><br>
> U did another test this morning powering rhe 5 V Bus from an external<br>
> power<br>
> supply.<br>
><br>
> The voltage on the power supply decreased to 3.8 Volt 1.4 A!<br>
><br>
> With powering from one 13.8 Voltvpower supply i have around 0.7 to 0.8 A.<br>
> And after the shutdown 0.3 A.<br>
><br>
> I am confused.<br>
><br>
> 73 Oliver<br>
> Am 19.02.2013 06:47 schrieb "Oliver Goldenstein" <<br>
> <a href="mailto:oliver.goldenstein@gmail.com" target="_blank">oliver.goldenstein@gmail.com</a>>:<br>
><br>
>> Hi Phil !<br>
>><br>
>> The Fuses are the 2 A ones and they are ok.<br>
>><br>
>> 73 Oliver DL6KBG<br>
>> Am 19.02.2013 02:07 schrieb "Phil Harman" <<a href="mailto:phil@pharman.org" target="_blank">phil@pharman.org</a>>:<br>
>><br>
>>> Hi Oliver,<br>
>>><br>
>>> Check F3, on early BOMs it was 1A but was increased to 2A on later<br>
>>> versions.<br>
>>><br>
>>> 73 Phil..VK6APH<br>
>>><br>
>>><br>
>>><br>
>>><br>
>>> > ***** High Performance Software Defined Radio Discussion List *****<br>
>>> ><br>
>>> > Hi All !<br>
>>> ><br>
>>> > I am having a problem since sunday. I am not making progress in<br>
>>> debugging<br>
>>> > the error. Hermes ran nearly the whole weekend during the contest.<br>
>>> The<br>
>>> > enclosure was warm but not hot.<br>
>>> ><br>
>>> > The problem:<br>
>>> ><br>
>>> > The board starts fine es every time and i can run it for lets say<br>
>>> one<br>
>>> > minute with cuSDR64, ghpsdr3. After the minute the leds are only<br>
>>> showing<br>
>>> > half of the light than before. the board is then no more reachable<br>
>>> and<br>
>>> > cannot be discovered. When i start the board in bootloader mode<br>
>>> > everything<br>
>>> > is normal. When i remove the jumper and powercycle the board it runs<br>
>>> also<br>
>>> > fine just to the time i put the networkcable in. it seems that<br>
>>> network<br>
>>> > traffic can speed up that failure.<br>
>>> ><br>
>>> > I measured as follows:<br>
>>> ><br>
>>> > U18, PIN3 = 13,6 Volt<br>
>>> > U18, PIN2 = 11,9 Volt<br>
>>> ><br>
>>> > in normal operation and after shutdown.<br>
>>> ><br>
>>> > The SMPS 5V output shows 4,96 V also in normal conditions and after<br>
>>> the<br>
>>> > shutdown (measured at L32). So i think the 12V and 5V Buses are ok ?!<br>
>>> ><br>
>>> > Now i measured at C153 and C174 and the input Pin of the LTC1529.<br>
>>> During<br>
>>> > the normal operation i have 4,45 Volt there. During the minute until<br>
>>> the<br>
>>> > shutdown the Voltage decreases down to 2,83 Volt in 0,01 Volt steps.<br>
>>> The<br>
>>> > last steps are faster.<br>
>>> ><br>
>>> > When i understand the schematics right i should have the same voltage<br>
>>> at<br>
>>> > the end of L32 and at C153.<br>
>>> ><br>
>>> > This must be something serious or silly. I hope the last one.<br>
>>> ><br>
>>> > In bootloader mode i am able to program and successfully reprogrammed<br>
>>> the<br>
>>> > board back to 2.2 which results in the same behaviour.<br>
>>> ><br>
>>> > 73 Oliver DL6KBG<br>
>>> > _______________________________________________<br>
>>> > HPSDR Discussion List<br>
>>> > To post msg: <a href="mailto:hpsdr@openhpsdr.org" target="_blank">hpsdr@openhpsdr.org</a><br>
>>> > Subscription help:<br>
>>> > <a href="http://lists.openhpsdr.org/listinfo.cgi/hpsdr-openhpsdr.org" target="_blank">http://lists.openhpsdr.org/listinfo.cgi/hpsdr-openhpsdr.org</a><br>
>>> > HPSDR web page: <a href="http://openhpsdr.org" target="_blank">http://openhpsdr.org</a><br>
>>> > Archives: <a href="http://lists.openhpsdr.org/pipermail/hpsdr-openhpsdr.org/" target="_blank">http://lists.openhpsdr.org/pipermail/hpsdr-openhpsdr.org/</a><br>
>>><br>
>>><br>
>>><br>
><br>
<br>
<br>
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