[Elecraft] K3 - Sub RX audio to right Line Out SOLVED

[Mike Harris]

Sorry Buck but it doesn't sound solved to me.

I've been following this thread and have just for sanities sake done the 
following test:

Line out = 7

Main and Sub RX set to frequency of my XG1 (approx 7040kHz)

XG1 set to 1uV out

Spectrogram set to stereo input

Windows sound mixer balanced L & R channel

Both Sub and Main RX on CW both with 500Hz roofers and 400Hz DSP, both 
filter gain compensation setting 4dB

Main RX level from Spectrogram = -82dB

Sub RX level from Spectrogram  = -85dB

If it turn off Sub RX, main RX level increases to -79dB

Clearly there are measurement calibration issues here, I didn't inject a 
fixed level test tone into each of the L&R channels on the PC to check 
the balance.

Never the less I would conclude there is still something very wrong with 
your line out.

Regards,

Mike VP8NO


<snip>
In the interest of future readers, here is what I found.

I had the LIN OUT menu item set to NOR 10 as recommended.  In fact, they
warn of going over that level.  However, when you turn on the SUB RX,
the signal is split and you lose 3db.  This can be heard in the
headphones.  It seems it also affects the Line Out.

When I increased the LIN OUT level to 35, the Sub Rx could be heard in
the right channel of the Line Out.  I have no idea how linear the LIN
OUT level setting is but I suspect that increase to 35 is what was
needed to overcome the attenuation that occurs when the Sub Rx switches in.

Now the issue is, the output seems unbalanced with the Main Rx signal on
the left channel of the Line Out jack being louder than the Sub Rx
signal on the right channel.   I am able to compensate for this by
turning down the Main Rx gain control on the MicroHam MKII.  I wasn't
able to even them out with the RF Gain control on the K3 but I will play
around with that some more.


Buck