Disappearing Line Out Audio for Sub Rx

[Dennis Egan]

K3 Firmware 5.10.

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

When in Diversity mode, I know there is audio in both headphones; shouldn't
there be audio on both channels of the Line Out?

Do I not have something set correctly, or is this a new feature?

Dennis W1UE
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[KK1W]

I see the same thing Dennis. I thought I was doing something wrong, or maybe we both are? K3s here with latest firmware.

Jim/KK1W

[wayne burdick]

Hi Dennis,

Do you have a diversity antenna connected to the sub (either the AUX ANT jack, or the non-TX KAT3 antenna)?

Also try doing A>B twice.

Wayne
N6KR

On Dec 5, 2015, at 5:05 AM, Dennis Egan <[hidden email]> wrote:

> K3 Firmware 5.10.
>
> When the K3 is put into Diversity and the mode is RTTY, the Line out Audio
> for the Sub Rx disappears.
>
> When in Diversity mode, I know there is audio in both headphones; shouldn't
> there be audio on both channels of the Line Out?
>
> Do I not have something set correctly, or is this a new feature?
>
> Dennis W1UE

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[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.

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[KK1W]

Wayne,

I haven't seen any further conversation about Dennis's issue.

I'm having a similar problem with data modes and the sub receiver. Here's an example using a strong CW signal as an example to make it easy to hear:

1. Tune in a strong CW with the subRX off.
2. Press the A/B button twice to copy all info to the subRX
3. Turn on the subRX (tap SUB)

At this point you will hear the main RX in the left speaker, the subRX in the right - as expected. It truly is the subRX audio as you can tune it and the right channel follows the tuning.

Now:

4. Change mode to DATA.

The result of this is you will hear the CW signal in the left channel change pitch but the CW signal in the right channel will remain unchanged - again as expected.

5. Press the A/B button twice to copy all info the subRX (the only thing changing should be the mode)

Result:

The audio remains unchanged in the left channel but the right channel goes dead. - NOT EXPECTED!

If I change the mode back to CW, then double tap the A/B button everything returns to normal. MainRX in left channel and subRX in the right.

This makes operating split in RTTY and trying to listen to the callers impossible. Perhaps this is by design?

No logging software or K3 utility connected at the time, the K3 port is closed.

Equipment:

K3s #00120
Firmware:
uC = 05.38
d1 = 02.86
d2 = 02.86
FL = 01.25
dr = 01.03

Thanks,

Jim/KK1W

[KK1W]

Thanks to Mike/VP8NO the problem is solved.

The solution was to check the 'Data' box in the subRX filter selection page. It was unchecked, not sure why, or how I missed it during setup.

Once again the value of this list is exceptional.

Thanks again Mike,

Jim/KK1W