[hpsdr] LINE-OUT on Hermes J16?

[KA5FPT Paul]

John,
Looking at the Hermes schematic, J16 carries a number of audio outputs 
according to the Hermes documents.

J16 pins 5 and 6 is the Headphone out and comes from U2 pins 9 and 10.

J16 pins 7 and 8 is Line audio out and comes from U2 pins 12 and 13. 
This is also fed to U21 (pins 4 and 21) which provides speaker audio.

J16 pins 14 and 15 is labeled as SPKOUT1 and SPKOUT2 according to the 
schematic, and comes from U21 pins 15 (ROUT-) and 22 (ROUT+). This also 
feeds J8 which is the "RIGHT SPEAKER HEADER".

There are no connections from the Left Speaker output (U21 pins 3 and 
10) to J16.

I am not sure what the audio level output is for J16 pins 7 and 8. You 
said you were using powered speakers and I would think it would be enough.

The question would be are the speaker out connections working? I can not 
find anything that would mute audio line out. If the speaker connections 
are working then obviously Audio Line Out must be working. There is a 
line coming from the Altera chip to U21 pin 11 which is labeled as the 
mute. I am sure someone more knowledgeable then me will chime in.

Paul Cecil
KA5FPT
DeSoto, Texas

Date: Sun, 25 Aug 2013 12:18:15 -0400
From: John Ackermann<jra at febo.com>
To: HPSDR List<hpsdr at openhpsdr.org>
Subject: [hpsdr] LINE-OUT on Hermes J16?
Message-ID:<521A2E47.6060804 at febo.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

Should the line-out lines on Hermes J16 (pins 7 and 8 as shown in the
manual) be active in parallel with the headphone and speaker outputs, or
are they mixed/controlled separately?  Or perhaps not implemented?

I'm testing the breakout board and when I plug my powered speakers into
what should be line-out, I don't hear anything.  The headphone outputs
(pins 5 and 6) are working as expected.  I'm trying to figure out if
there's a problem in the breakout board, or if it's just a matter of
PowerSDR settings (although I haven't found anything in the setup tab
around audio output routing).

Thanks,

John



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