[hpsdr] TAPR Hermes J15 problem?

[John]

Dave and group.  Thanks for the info.  There still may be a problem with 
the board layout.

I decided to cut down the shrouded connector I had for J15 by hollowing 
out one corner of its base to clear the two capacitors and cutting off 
the end facing J19.
Here are photos showing how the connector was modified:

     http://www.n-connect.net/radio/Ham_Pix/Hermes%20Pix/Modified%20J15.JPG

     
http://www.n-connect.net/radio/Ham_Pix/Hermes%20Pix/Modified%20J15%20Top.JPG

However, now with the cable supplied with TAPR Alex, there will not be 
enough clearance to use J19:

    
http://www.n-connect.net/radio/Ham_Pix/Hermes%20Pix/Modified%20J15%20interference.JPG

    
http://www.n-connect.net/radio/Ham_Pix/Hermes%20Pix/Modified%20J15%20interference%20top.JPG

According to the schematic I have (GAMMA v. 15):
             J19-2 goes to U17-4
             J19-3              u17-5
    whereas:
             J16-11 goes to U17-7
             J16-12             U17-6
In other words, these are different A/D inputs to Hermes.  They are not 
in parallel.

Do I just hook my Penny Whistle VSWR signals up to J16 and forget J19?

73,

John,  WoGN





On 11/29/2012 6:02 AM, Bruce Beford wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
> John,
> I would use a straight male -header- not an enclosed jack. This will prevent
> problems with the tight spacing between these two connectors. There is no
> need or advantage to using a jack with the shell on it. As you note, there
> is no room for the keyed shell. Just get it on right when you plug it in.
>
> Also, you no doubt already know this, based on your pics, but others may not
> have realized): you must mount the J15 connector on the top side of the
> board, for the pin out to be correct. Note the red pin 1 notations on the
> board pictures in the latest (v1.9) Hermes manual. J15 is laid out for top
> mounting, J32 for bottom mounting. On a multi-layer board, you -don't- want
> to get it wrong and have to remove it!
>
> GL,
> Bruce, N1RX
>    


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