[Elecraft] [K3] Line out, speakers, and L-mix-R settings...

[Richard Ferch]

James,

I hope your daughter is feeling better soon.

Re your questions (based on my observations using sound card software on 
both channels from the LINE OUT jack, and stereo headphones plugged into 
the SPKRS jack):

1. The CONFIG:SPKRS setting only affects the rear panel SPKRS jack. It 
has no effect on LINE OUT.

2. None of the audio mixing or level controls has any effect on the LINE 
OUT signal, as far as I can tell. The left channel always carries the 
main RX output, and the right channel always carries the sub RX output. 
The LINE output is "raw" unmixed audio from the two receivers at a fixed 
level set by CONFIG:LIN OUT.

3. When CONFIG:SPKRS = 2, the SPKRS jack behaves the same as the 
headphone jacks. With SUB off, the main RX is in both channels, and with 
SUB on and the normal L-MIX-R setting, the main RX and sub RX are in 
left and right channels respectively. Changing the L-MIX-R setting 
affects the SPKRS the same way as it affects the PHONES output.

When CONFIG:SPKRS = 1, the only speaker output is on the left channel of 
the SPKRS jack, i.e. it disables the right channel output even when SUB 
is on. If SUB is on, the external mono speaker on the left channel 
carries audio from both receivers mixed together, the same as the 
internal speaker. The purpose of the CONFIG:SPKRS = 1 option is to 
protect the speaker amp if a mono plug is plugged into the SPKRS jack.

73,
Rich VE3KI