[Elecraft] Disappearing Line Out Audio for Sub Rx

[Richard Ferch]

I am wondering why you would want to use Diversity mode in RTTY, and how 
you would actually make use of it. Diversity mode works by feeding two 
slightly different signals into a single brain that is programmed from 
birth to cope with two such inputs (two ears) and synthesize them into a 
combined information stream, using the phase and amplitude differences 
to add information value. The RTTY decoders I am familiar with don't do 
that; they are monaural.

If you want to use two separate monaural decoders on the audio inputs 
from the two receivers, don't use diversity mode, just turn the subRX on 
and let each decoder decode its own input stream. If the two VFOs are 
not linked, each receiver would be listening to its own frequency 
(SO2V), but if you link the two VFOs (CONFIG:VFO LNK = ON), you can 
force both receivers to listen to the same frequency (presumably on 
different antennas, else what's the point?).

This is different from "diversity decoding", which uses two different 
decoding algorithms on a single audio stream so you can compare the 
results of the two algorithms and pick the one that works best under the 
current instantaneous conditions. You don't need a second receiver for 
that; you can use an arbitrary number of decoders using the same channel 
of the same sound card and get the benefits of diversity decoding even 
with a single receiver.

73,
Rich VE3KI



W1UE wrote:

> When the K3 is put into Diversity and the mode is RTTY, the Line out Audio
> for the Sub Rx disappears.