[hpsdr] picoPSU-120-WI-25
Mike F
mikecf100 at gmail.com
Wed Dec 28 16:25:46 PST 2011
Of the picoPSU supplies, the picoPSU-120-WI-25 is the one most
compatable with HPSDR and existing ham gear because it will operate at
the automobile voltages. My question is: has anyone investigated the
performance of this unit to determine:
1) is there any noise created by the switching supplies that might
degrade the receive performance?
2) what is the actual minimum input voltage where the unit will work at
our loads. Unfortunately, if this unit were being used from a car 12
volt system, it is a sure thing that the voltage will drop below 12
volts occasionally (i.e. starting). It would be nice if HPSDR continues
to operate without stress during those events.
I presently have my HPSDR system (Mercury, Penelope, Metis) packaged in
an external drive case that I bought at a local pc recycle place. I use
the supply that was originally in the drive case, and don't seem to have
problems with the switching supply. In actuality I haven't done a
careful evaluation, but there is nothing obvious.
Mike, K7SR
>
> Message: 6
> Date: Wed, 28 Dec 2011 14:04:05 -0500
> From: n3evl<n3evl at townisp.com>
> To: hpsdr at lists.openhpsdr.org
> Subject: Re: [hpsdr] LPU Capacity
> Message-ID:<4EFB6825.2040906 at townisp.com>
> Content-Type: text/plain; charset="iso-8859-1"; Format="flowed"
>
> A couple of months ago I decided to retire LPU in favor of the
> picoPSU-120-WI-25. This appears to fulfill the current requirements of
> the usual suspects + Metis at 1 Gigabit. The picoPSU spec quotes two
> figures for 5V:
>
> 5V 6A
> 5VSB 1.5A
>
> I have no idea what 5VSB refers to - maybe somebody can shed some light
> on this designation?
>
> The picoPSU unit is quite small and does not have the tall heatsinks
> used with LPU. It supposedly runs quite a bit cooler but I left the
> fan in place figuring some air flow through Pandora can't hurt.
>
> Pete, N3EVL
>
> On 12/28/2011 10:03 AM, Chris Day wrote:
>> ***** High Performance Software Defined Radio Discussion List *****
>>
>>
>>
>> Thanks, Erich. Replacing the soft fuses with wire has been enough so
>> far, but I haven't fired up the transmitter section of Pennylane yet.
>> Linear chain will be external, so there will be no extra load from
>> that. Meanwhile, playing with Mercury with delightful results.
>>
>> Chris Day
>> AE6VK
>>
>>
>>> Date: Wed, 28 Dec 2011 04:12:10 -0800
>>> From: vk5hse at yahoo.com
>>> To: hpsdr at lists.openhpsdr.org
>>> Subject: Re: [hpsdr] LPU Capacity
>>>
>>> ***** High Performance Software Defined Radio Discussion List *****
>>>
>>> Have cobbled together various reflector postings for my own
>> reference as well as for others.
>>>
>>>
>>> There was a summary posted to the reflector that is worth reviewing:
>>>
>>>
>> http://lists.openhpsdr.org/pipermail/hpsdr-openhpsdr.org/2011-March/014678.html
>>>
>>> the meaty bits were:
>>>
>>> Magister = Ozy
>>>
>>>
>>> power consumption summary:
>>>
>>>
>>> 12 V 5 v
>>> OZY .001 A .1 A
>>> PENY .4 A .2 A
>>> MERC .2 A .5 A
>>>
>>> Metis 100 .4A
>>>
>>> Metis 1000bT .75A
>>>
>>>
>>> no-one seems to have stated excalibur power requirements, but it
>> doesn't appear to be huge
>>>
>>>
>>> add the LPU errata document:
>>>
>>> http://www.tapr.org/pdf/LPU_Errata.pdf
>>>
>>> which mentions in errata #2:
>>>
>>> "Description of Error:
>>> Fuses F2 and F3 are underrated for a full system. They are rated at
>> continuous 1.1A without
>>> tripping, while an Ozy/Mercury/Penelope system draws typically 1.3A
>> from the +5V rail.
>>>
>>>
>>> Symptoms:
>>> An Ozy/Mercury/Penelope system will operate for a short period and
>> then unexpectedly shut
>>> down. The time can vary, but is typically around 10 minutes. This is
>> due to F2 opening and shutting
>>> down the +5V output. (Note that F2 doesn't actually "open"; it
>> becomes higher resistance to protect
>>> the load.) After a power cycle, normal operation resumes.
>>>
>>>
>>> Recommended Corrective Action:
>>> Short across F2 and F3 with pieces of wire."
>>>
>>>
>>>
>>> There has also been talk of strapping the 12V feedtrhough for high
>> power things like a PA
>>>
>>>
>> http://lists.openhpsdr.org/pipermail/hpsdr-openhpsdr.org/2010-July/012616.html
>>>
>>> and some suggestion of shorting the 5V fuse and relying on the
>> regulator to protect itself +/- modifying R6 the series resistor
>>>
>>>
>> http://lists.openhpsdr.org/pipermail/hpsdr-openhpsdr.org/2010-July/012617.html
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>>
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> ------------------------------
>
> Message: 7
> Date: Wed, 28 Dec 2011 20:39:31 +0100
> From: "Kjell Karlsen"<la2ni at online.no>
> To: hpsdr at lists.openhpsdr.org, n3evl<n3evl at townisp.com>
> Subject: Re: [hpsdr] LPU Capacity
> Message-ID:<op.v67sv5linknqug at kjell-pc.lan>
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> delsp=yes
>
> Hi Pete.
>
> The 5VSB refers to the output on pin 9 on the ATX connector and is used
> for stand by of the PC. I do not think it is used on the Atlas bus card.
>
> 73, Kjell
>
>
>
>
>
> P? Wed, 28 Dec 2011 20:04:05 +0100, skrev n3evl<n3evl at townisp.com>:
>
>> ***** High Performance Software Defined Radio Discussion List *****
>>
>
>
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