[hpsdr] How do you switch power to Atlas

[n3evl]

FWIW, I'm just today in the process of replacing the LPU with a PicoPSU 
and discovered that while LPU does not care about T7 T8, the PicoPSU 
certainly does.  Fortunately I already had a switch wired across T7 T8 
since, a while back, I'd used Atlas with a conventional PC PSU.

Pete, N3EVL


On 12/3/2011 6:09 PM, Chris Smith wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
> Mark
>
> I'm pretty certain that pulling pin 4 low on a standard ATX PSU has the effect of powering up the PSU. If you're using the LPU then pin 4 will have no effect, so a jumper from T7 to T8 won't have any effect either.
>
> Cheers&  73
>
> Chris G4NUX
>
> On 3 Dec 2011, at 22:54, Mark Leone wrote:
>
>> ***** High Performance Software Defined Radio Discussion List *****
>>
>> After running my HPSDR system for a week or so, I finally got around to installing a power switch. The Atlas documentation says to jumper T7 and T8 together to enable Atlas to be powered up, and install a power switch across T7 and T8 if desired.
>>
>> After installing the switch across T7 and T8, Atlas is still powered up regardless of the switch position. I thought maybe I created a solder bridge somewhere, but that doesn't seem to be the case. There is no conductivity between T7 and T8 when the switch is turned off, and Atlas remains powered up.
>>
>> So then I looked at the schematics for Atlas and LPU, and it seems that LPU has no provision for being powered on and off. Shorting T7 and T8 on Atlas pulls pin 14 of the ATX connector to ground. But pin 14 on LPU is not connected to anything. The power could be disabled by pulling pin 4 low on the regulators, but it's not wired that way.
>>
>> Am I misunderstanding something here? What is the best way to wire in a power switch for an HPSDR system?
>>
>> -Mark / K4XML
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