[hpsdr] picoPSU-120-WI-25
Kjell Karlsen
la2ni at online.no
Thu Dec 29 01:14:57 PST 2011
Hi Mike.
I have just built a complete HPSDR transceiver into a Pandora enclosure
with Atlas, Mercury, Penny, Metis and Alex filters + the prototype of
Munin, a 100W PA.
I use a PicoPSU M3-ATX 6-24V DC/DC (125 Watt). It runs from 6-24V DC and
works fine and cool.
Only 2 spurs are heard, one on 160m at 1830KHz and one on 80m at 3660 KHz.
Both at -120dBm. No spurs are detected on the other bands that comes from
the PicoPSU.
PicoPSU also have different SMPSU´s that is not plugged directly into the
Atlas bus. (M2-ATX-HV 6-32V DC/DC (140 Watt)) They may be installed into a
shielded box with more filtering in the leads (ferrite beads) to prevent
spurs. It has to be tested.
It is possible to construct Switch Mode PSU´s that are completely without
spurs. In Hermes, the new HPSDR transceiver we are using a SMPSU installed
on the PCB and Abhi reports that only one spur is detected so far. It is
possible to change switching frequency to move this spur outside the
amateur band. Anyway, it is very weak, around -130dBm (if I remember
right).
73, Kjell
På Thu, 29 Dec 2011 01:25:46 +0100, skrev Mike F <mikecf100 at gmail.com>:
> ***** High Performance Software Defined Radio Discussion List *****
>
> 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
>>>> _______________________________________________
>>>> HPSDR Discussion List
>>>> To post msg: hpsdr at openhpsdr.org
>>>> Subscription help:
>>> http://lists.openhpsdr.org/listinfo.cgi/hpsdr-openhpsdr.org
>>>> HPSDR web page: http://openhpsdr.org
>>>> Archives: http://lists.openhpsdr.org/pipermail/hpsdr-openhpsdr.org/
>>>
>>>
>>> _______________________________________________
>>> HPSDR Discussion List
>>> To post msg: hpsdr at openhpsdr.org
>>> Subscription help:
>>> http://lists.openhpsdr.org/listinfo.cgi/hpsdr-openhpsdr.org
>>> HPSDR web page: http://openhpsdr.org
>>> Archives: http://lists.openhpsdr.org/pipermail/hpsdr-openhpsdr.org/
>>>
>>>
>>> No virus found in this message.
>>> Checked by AVG - www.avg.com<http://www.avg.com>
>>> Version: 2012.0.1901 / Virus Database: 2109/4708 - Release Date:
>>> 12/28/11
>>>
>>
>> -------------- next part --------------
>> An HTML attachment was scrubbed...
>> URL:<http://lists.openhpsdr.org/pipermail/hpsdr-openhpsdr.org/attachments/20111228/4f82cfb6/attachment-0001.htm>
>>
>> ------------------------------
>>
>> 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>
>> Content-Type: text/plain; charset=iso-8859-15; format=flowed;
>> 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 *****
>>>
>>
>>
> _______________________________________________
> HPSDR Discussion List
> To post msg: hpsdr at openhpsdr.org
> Subscription help:
> http://lists.openhpsdr.org/listinfo.cgi/hpsdr-openhpsdr.org
> HPSDR web page: http://openhpsdr.org
> Archives: http://lists.openhpsdr.org/pipermail/hpsdr-openhpsdr.org/
>
>
--
Sendt med Operas revolusjonerende e-postprogram: http://www.opera.com/mail/
1325150097.0
More information about the Hpsdr
mailing list