[hpsdr] Hermes - initial powerup

[Scott Cowling]

The power switch is not needed. It is bypassed with zero-ohm resistors.

J10 pinout:
+12V to J10-1
gnd to J10-2
gnd to J10-3
+5V to J10-4

Jumper J21 to enable the on-board 12V to 5V SMPS. This just connects 
the power to it, it doesn't connect the +5V output to the rest of the 
board. J26 does that.

J26 selects the +5V source: pins 1-2 for off-board +5V power or pins 
2-3 for on-board SMPS supplied power.

Jumper J18 to supply power to the on-board 12V LDO. This just 
connects the power to it, it doesn't connect the +12V output to the 
PA and Alex header. J17 does that.

J17 selects the +12V source: pins 1-2 for off-board +12V power or 
pins 2-3 for on-board LDO supplied power.

If your power input is +13.8V, you MUST use jumper J18 and J17 pins 
2-3, as the PA is not designed for 13.8VDC power, just 12.0V power.

If you limit your input voltage to 12.0V, you can un-jumper J18 and 
jumper J17 pins 1-2 to run the 12V section of Hermes (PA and Alex 
header) off of that. The SMPS will work fine from either 12.0V or 13.8V.


That pretty much summarizes the power connector/headers in the lower 
left corner.

73,
Scotty WA2DFI



At 14:01 2012-03-29 -0700, you wrote:
>***** High Performance Software Defined Radio Discussion List *****
>
>On Mar 29, 2012, at 1:51 PM, Lyle Johnson wrote:
>
> > ***** High Performance Software Defined Radio Discussion List *****
> >
> > On my board, J10 is missing (power connector).  Do we have a part 
> number available so I can order a connector?  It is hard to tell 
> from the phtotgraph, but the manual specifies polarity referring to 
> pin 1 and pin 2.  Is the connector so labeled, or is this a 2.x mm 
> "coaxial" connector in which case is the center pin positive?
>
> From what I can tell, J10 seems to be moved from the picture that 
> Phil has in the manual.  Note that the PCB says "J27" in the spot 
> where Phil has it marked in the picture.  J10 seems to now by right 
> behind where SW1 is.  It's a 4-pin connector, and this seems to 
> correspond to what Phil has written in the manual, with pins 1&2 
> being 13.8V and pins 3&4 being an external 5V supply, if selected.
>
> > Also, the power switch SW1 is missing.  Same question - where can 
> I obtain one?  Or is there a jumper setting that makes the power 
> switch get bypassed?  The user manual states that the power switch 
> must be activated, so I am (again) assuming the switch is a requirement.
> >
> > Thanks!
> >
> > Lyle KK7P
>
>--
>Jeremy McDermond (NH6Z)
>Xenotropic Systems
>mcdermj at xenotropic.com
>
>
>
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