[hpsdr] Power Ping RFQ

[ke5eup at ke5eup.com]

I bought one of the pico's back in 01/07. I never got around to testing 
it, It is the 60watt. I was hoping we could use  a  small form factor 
like it.

Thanks,
Al
KE5EUP
KCARC,ARRL,TAPR,AMSAT,HPSDR



Ben Hall wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
> Hey Eric and gang,
>
> I'll chime in quickly - it's getting late for me.
>
>  From the research I've done for Pandora, it seems that the power supply 
> requirements right now are very low - under 20 watts for existing Atlas, 
> Janus, Ozy, and planned for Penelope and Sasquatch.
>
> With under 20 watts being easily handled by linear supplies, I'm not 
> sure that there is a need to use anything besides linear supplies.
>
> One problem I've found with the picoPSU switchers is that they can only 
> do 100 mA on the negative supplies.  I know I had to modify my power 
> supply tester when I was testing my picoPSU as it was set to draw more 
> like 400 mA.
>
> Yet, with linears, portable operation off of a 12 VDC battery becomes 
> problematic due to the fact that existing HPSDR boards need the negative 
> supplies.  You could use another 12 VDC battery, but that's a lot of weight.
>
> Perhaps the negative voltage draw is low enough that a charge pump 
> inverter could be used?
>
> Interesting this came up - was reading about just such a supply in 
> Horowitz and Hill "Art of Electronics" at the hospital today.  Seems 50 
> to 100 ma is possible?
>
> I will think more about this tomorrow.  I've used some NICE open-frame 
> supplies from Lambda/Power One/ACDX/Etc., and some real junk too.
>
> thanks and 73,
> b, KD5BYB
>
> Eric Ellison wrote:
>
>   
>> I got an off-list question from a friend who was inquiring about power 
>> supplies for Janus/Ozy. 
>>     
>
> <snip>
>
>   
>> Obviously most of the Alpha testers, have used regulated bench supplies. 
>> Chris AE6VK has used the 60 and 120 W PicoPSU and shown it to work and 
>> be pretty ‘clean’. (Thanks Chris!)
>>
>> Would it be advisable to spend a little more money and go with a 
>> Power-One or Lambda multi-voltage linear open frame supply?
>>
>>  
>>
>> What is the minimum wattage we would need if just these 2 boards?
>>
>>  
>>
>> Anyone have any suggestions for a good ATX supply? Considerations for 
>> selection? Mods? Circuit Protection for Atlas + Projects?
>>
>>  
>>
>> Personally I am going to take a shot, and have purchased a PicoPSU 120 W 
>> 12-32, based on Chris’s work, in the absence of any personal experience.
>>
>>  
>>
>> Also:
>>
>>  
>>
>>    1. It can be powered by my 12 v. station supply and fused.
>>    2. It is small.
>>    3. This is the only device anyone has tested.
>>    4. I don’t feel that I want to invest in a 3 voltage regulated bench
>>       supply. (not very portable!)
>>    5. It does not require any minimum ’load’ modifications to run.
>>    6. They come with all connectors.
>>    7. They are cute.
>>
>>  
>>
>>  They are out of 12-32, but have what looks like an equivalent 12-25 in 
>> stock.
>>     
>
>   

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