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

[K2QI]

Curious thing I noticed today; plugged in my headphones only to continue
hearing monoraul audio coming out of my PC's speakers.  It took me a second
to realize that audio from the K3 was being piped out of the LINE OUT jack
in the rear, into my PC's input, and out to the two speakers I have sitting
on my desk.

At first I thought it was strange that the audio I was hearing was only
coming out of the left speaker rather than both.  I checked the manual and
after a few minutes of reading realized that under normal situations,
activating the SUB would provide the right channel.  I then started playing
around a bit more, and figured I'd post this question to the group just to
make sure I understand how these functions work properly.

My experimentation led me to the SPKRS settings which was currently set at
1.  With the SUB off, I changed the speaker setting to 2 but no change;
audio was still being heard on the left speaker and not the right.  Am I
then correct in my assumption that the speakers setting has no bearing on
the actual number of channels being output from the LINE OUT jack?

This brings me to my second question - is there a way to get both L and R
channel audio output to the LINE OUT jack just from the main receiver
without the SUB being activated?

My last question, does the SPEAKERS setting only affect the SPKR OUT jack on
the rear panel?  According to the manual, leaving it at 1 will only provide
one channel of audio.  Would setting it to 2 provide both L&R channels to
the speakers regardless of SUB activation?

Mni tnx es happy thanksgiving.
--
73 de James K2QI
President UNARC/4U1UN
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[K2QI]

No suggestions?

Hope everyone had a good thanksgiving.  I know mine is about to start; my
11mo daughter just came home from pediatric ICU.  I am thankful for that.

73,
James K2QI

On Wed, Nov 24, 2010 at 10:19 PM, James Sarte (K2QI) <[hidden email]>wrote:

> Curious thing I noticed today; plugged in my headphones only to continue
> hearing monoraul audio coming out of my PC's speakers.  It took me a second
> to realize that audio from the K3 was being piped out of the LINE OUT jack
> in the rear, into my PC's input, and out to the two speakers I have sitting
> on my desk.
>
> At first I thought it was strange that the audio I was hearing was only
> coming out of the left speaker rather than both.  I checked the manual and
> after a few minutes of reading realized that under normal situations,
> activating the SUB would provide the right channel.  I then started playing
> around a bit more, and figured I'd post this question to the group just to
> make sure I understand how these functions work properly.
>
> My experimentation led me to the SPKRS settings which was currently set at
> 1.  With the SUB off, I changed the speaker setting to 2 but no change;
> audio was still being heard on the left speaker and not the right.  Am I
> then correct in my assumption that the speakers setting has no bearing on
> the actual number of channels being output from the LINE OUT jack?
>
> This brings me to my second question - is there a way to get both L and R
> channel audio output to the LINE OUT jack just from the main receiver
> without the SUB being activated?
>
> My last question, does the SPEAKERS setting only affect the SPKR OUT jack
> on the rear panel?  According to the manual, leaving it at 1 will only
> provide one channel of audio.  Would setting it to 2 provide both L&R
> channels to the speakers regardless of SUB activation?
>
> Mni tnx es happy thanksgiving.
> --
> 73 de James K2QI
> President UNARC/4U1UN
>
>

--
73 de James K2QI
President UNARC/4U1UN
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[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






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[K2QI]

Thank you Rich,

My daughter had a severe case of bronchiolitis. I'm happy to say that she's on the mend back at home.

Also, I'm grateful for your reply to my questions. You have confirmed my assumptions.

73 and Happy Holidays,
James K2QI
Sent via BlackBerry from T-Mobile

-----Original Message-----
From: Richard Ferch <[hidden email]>
Sender: [hidden email]
Date: Fri, 26 Nov 2010 23:52:09
To: [hidden email]<[hidden email]>
Subject: Re: [Elecraft] [K3] Line out, speakers, and L-mix-R settings...

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






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[Mike Reublin]

Re: point #2.

I don't have a sub rx, so it's never been a problem for me, but I'm thinking of
adding one.  How does that work if there's a RTTY  signal on both VFO's (simplex)?
Would you have to tap A>B?

The manual sez "Use CONFIG: LIN OUT to set the level, or to switch from a fixed-level
setting to =PHONES." Does that give you a level control using the AF knob?

73, Mike NF4L

On 11/26/2010 11:52 PM, Richard Ferch wrote:

> 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
>
>
>
>
>
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
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> Please help support this email list: http://www.qsl.net/donate.html
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[Joe Subich, W4TV-4]

>> I don't have a sub rx, so it's never been a problem for me, but I'm
>> thinking of adding one.  How does that work if there's a RTTY
>> signal on both VFO's (simplex)? Would you have to tap A>B?

The best way to handle RTTY with signals on both receivers is to run
two copies of MMTTY (or other decoder) - one for reach receiver.  MixW
has a dual receive capability - I don't know about any of the other
software.  In general, one decoder uses the soundcard left channel
and the second uses soundcard right channel audio.  Mixing the two
audio streams does not work ... it merely results in QRM.

73,

    ... Joe, W4TV


On 11/27/2010 5:34 AM, Mike wrote:

> Re: point #2.
>
> I don't have a sub rx, so it's never been a problem for me, but I'm thinking of
> adding one.  How does that work if there's a RTTY  signal on both VFO's (simplex)?
> Would you have to tap A>B?
>
> The manual sez "Use CONFIG: LIN OUT to set the level, or to switch from a fixed-level
> setting to =PHONES." Does that give you a level control using the AF knob?
>
> 73, Mike NF4L
>
> On 11/26/2010 11:52 PM, Richard Ferch wrote:
>> 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
>>
>>
>>
>>
>>
>>
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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>>
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>>
>
>
> ______________________________________________________________
> Elecraft mailing list
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[Richard Ferch]

Mike,

Thanks for pointing that out - I had completely forgotten about that
option. I guess it's time I printed out a new copy of the manual! Of
course, that changes the answer to James' question #2; if you want the
LINE output to be a clone of the headphones output, set CONFIG:LIN OUT
to =PHONES.

With CONFIG:LIN OUT =PHONES, when the subRX is off, the main RX is in
both channels. This setting seems tailor-made for James' situation
(listening to speakers through a sound card).

For digital modes, as Joe has pointed out, when SUB is on, you use the
two channels to feed two independent copies of MMTTY (or other
software). You do not want any mixing of the two signals. Also, you do
not want the volume control to affect the audio level going into the
decoder. If you use the audio pitch as a tuning aid, you want the
ability to turn the audio down or to change the balance between the two
channels without interrupting the ongoing decoding of both signals.

When SUB is off, you only use (or need) one channel in the sound card.
The right channel waterfall just goes black when the sub RX is off. You
can use two different decoding algorithms on a single signal by running
two (or more) independent decoding programs (e.g. two or more separate
copies of MMTTY using different profiles) from a single channel in the
sound card.

73,
Rich VE3KI


NF4L wrote:

> Re: point #2.
>
> I don't have a sub rx, so it's never been a problem for me, but I'm thinking of
> adding one.  How does that work if there's a RTTY  signal on both VFO's (simplex)?
> Would you have to tap A>B?
>
> The manual sez "Use CONFIG: LIN OUT to set the level, or to switch from a fixed-level
> setting to =PHONES." Does that give you a level control using the AF knob?
>
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[Mike Reublin]

Joe, if you mean stand alone MMTTY, I don't understand. I wouldn't want to copy copy
both signals.
Each copy of MMTTY could use a different sound card (given 2 sound cards) but still
no way to direct sound by channel.

I suppose the Windoze mixer could be used to set the balance. Or cut a wire in the
audio cable.

All that strikes me as a kludge, but I certainly don't have a better solution. :-(

Mike NF4L


On 11/27/2010 8:14 AM, Joe Subich, W4TV wrote:
I     don't have a sub rx, so it's never been a problem for me, but I'm

>>> thinking of adding one.  How does that work if there's a RTTY
>>> signal on both VFO's (simplex)? Would you have to tap A>B?
> The best way to handle RTTY with signals on both receivers is to run
> two copies of MMTTY (or other decoder) - one for reach receiver.  MixW
> has a dual receive capability - I don't know about any of the other
> software.  In general, one decoder uses the soundcard left channel
> and the second uses soundcard right channel audio.  Mixing the two
> audio streams does not work ... it merely results in QRM.
>
> 73,
>
>      ... Joe, W4TV
>
>
> On 11/27/2010 5:34 AM, Mike wrote:
>> Re: point #2.
>>
>> I don't have a sub rx, so it's never been a problem for me, but I'm thinking of
>> adding one.  How does that work if there's a RTTY  signal on both VFO's (simplex)?
>> Would you have to tap A>B?
>>
>> The manual sez "Use CONFIG: LIN OUT to set the level, or to switch from a fixed-level
>> setting to =PHONES." Does that give you a level control using the AF knob?
>>
>> 73, Mike NF4L
>>
>> On 11/26/2010 11:52 PM, Richard Ferch wrote:
>>> 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

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[Joe Subich, W4TV-4]

 > I suppose the Windoze mixer could be used to set the balance. Or cut
 > a wire in the audio cable.

You don't want to mix the signals ... they would QRM each other.  I
can't see any reason for mixing them and running independent copies
of MMTTY or MixW in the dual channel mode is the best way to "select"
the signal.

73,

    ... Joe, W4TV

On 11/27/2010 8:58 AM, Mike wrote:

> Joe, if you mean stand alone MMTTY, I don't understand. I wouldn't want to copy copy
> both signals.
> Each copy of MMTTY could use a different sound card (given 2 sound cards) but still
> no way to direct sound by channel.
>
> I suppose the Windoze mixer could be used to set the balance. Or cut a wire in the
> audio cable.
>
> All that strikes me as a kludge, but I certainly don't have a better solution. :-(
>
> Mike NF4L
>
>
> On 11/27/2010 8:14 AM, Joe Subich, W4TV wrote:
> I     don't have a sub rx, so it's never been a problem for me, but I'm
>>>> thinking of adding one.  How does that work if there's a RTTY
>>>> signal on both VFO's (simplex)? Would you have to tap A>B?
>> The best way to handle RTTY with signals on both receivers is to run
>> two copies of MMTTY (or other decoder) - one for reach receiver.  MixW
>> has a dual receive capability - I don't know about any of the other
>> software.  In general, one decoder uses the soundcard left channel
>> and the second uses soundcard right channel audio.  Mixing the two
>> audio streams does not work ... it merely results in QRM.
>>
>> 73,
>>
>>       ... Joe, W4TV
>>
>>
>> On 11/27/2010 5:34 AM, Mike wrote:
>>> Re: point #2.
>>>
>>> I don't have a sub rx, so it's never been a problem for me, but I'm thinking of
>>> adding one.  How does that work if there's a RTTY  signal on both VFO's (simplex)?
>>> Would you have to tap A>B?
>>>
>>> The manual sez "Use CONFIG: LIN OUT to set the level, or to switch from a fixed-level
>>> setting to =PHONES." Does that give you a level control using the AF knob?
>>>
>>> 73, Mike NF4L
>>>
>>> On 11/26/2010 11:52 PM, Richard Ferch wrote:
>>>> 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
>
>
> ______________________________________________________________
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[Mike Reublin]

I'm not suggesting mixing signals, in fact I'm trying to arrive at a method of
conveniently eliminating one of them.

I just looked into MMTTY and saw (for the first time)  the ability to select mono,
left, or right. Kewl! :-P

73, Mike NF4L


On 11/27/2010 9:26 AM, Joe Subich, W4TV wrote:

>   >  I suppose the Windoze mixer could be used to set the balance. Or cut
>   >  a wire in the audio cable.
>
> You don't want to mix the signals ... they would QRM each other.  I
> can't see any reason for mixing them and running independent copies
> of MMTTY or MixW in the dual channel mode is the best way to "select"
> the signal.
>
> 73,
>
>      ... Joe, W4TV
>
> On 11/27/2010 8:58 AM, Mike wrote:
>> Joe, if you mean stand alone MMTTY, I don't understand. I wouldn't want to copy copy
>> both signals.
>> Each copy of MMTTY could use a different sound card (given 2 sound cards) but still
>> no way to direct sound by channel.
>>
>> I suppose the Windoze mixer could be used to set the balance. Or cut a wire in the
>> audio cable.
>>
>> All that strikes me as a kludge, but I certainly don't have a better solution. :-(
>>
>> Mike NF4L
>>
>>
>> On 11/27/2010 8:14 AM, Joe Subich, W4TV wrote:
>> I     don't have a sub rx, so it's never been a problem for me, but I'm
>>>>> thinking of adding one.  How does that work if there's a RTTY
>>>>> signal on both VFO's (simplex)? Would you have to tap A>B?
>>> The best way to handle RTTY with signals on both receivers is to run
>>> two copies of MMTTY (or other decoder) - one for reach receiver.  MixW
>>> has a dual receive capability - I don't know about any of the other
>>> software.  In general, one decoder uses the soundcard left channel
>>> and the second uses soundcard right channel audio.  Mixing the two
>>> audio streams does not work ... it merely results in QRM.
>>>
>>> 73,
>>>
>>>        ... Joe, W4TV

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[Richard Ferch]

Mike,

I don't understand why you think there is a problem. I guess I don't
understand what you are trying to do.

The hardware setup to use both receivers in RTTY is simple, and no
different from what you use with a single receiver - a single stereo
cable from the K3's LINE OUT to the sound card's LINE IN for receive, a
single mono (or stereo) cable from the sound card's LINE OUT to the K3's
LINE IN for AFSK transmit, and use RTS on the radio control port for
PTT. Or, if you prefer FSK, replace the AFSK transmit cable with FSK and
PTT keying circuits to the AUX input.

There is no need for a second sound card, no need to cut cables, no need
to use a mixer to adjust balance.

You set up one copy of MMTTY to receive using only the left channel of a
single sound card, and a separate copy of MMTTY to receive using only
the right channel of the same sound card. The two operate entirely
independently. One decodes the signal from the main receiver, the other
one from the sub receiver. If you only want to copy one signal, just
don't look at the output from the other copy of MMTTY, or if you find it
distracting, just turn SUB off and/or close down the second copy of MMTTY.

 From N1MM Logger, you can open two Entry windows, one for each VFO, and
open a separate Digital Interface window from each Entry window, with
separate copies of MMTTY each configured to use the appropriate channel
of the sound card. You can receive on both receivers at once, and choose
which one to transmit to with the "\" key. Or, if you only want to use
one VFO, just close down the second Entry window.

73,
Rich VE3KI


NF4L wrote:

> All that strikes me as a kludge, but I certainly don't have a better solution. :-(
>
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[Mike Reublin]

Richard,

The problem is, as usual, my lack of understanding of how something works. Now that I
realize that MMTTY can select either channel, I get it. Unfortunately my PSK software
can't do that. :-(

Thanks to both you and Joe for the guidance.

73, Mike NF4L

On 11/27/2010 10:54 AM, Richard Ferch wrote:

> Mike,
>
> I don't understand why you think there is a problem. I guess I don't
> understand what you are trying to do.
>
> The hardware setup to use both receivers in RTTY is simple, and no
> different from what you use with a single receiver - a single stereo
> cable from the K3's LINE OUT to the sound card's LINE IN for receive, a
> single mono (or stereo) cable from the sound card's LINE OUT to the K3's
> LINE IN for AFSK transmit, and use RTS on the radio control port for
> PTT. Or, if you prefer FSK, replace the AFSK transmit cable with FSK and
> PTT keying circuits to the AUX input.
>
> There is no need for a second sound card, no need to cut cables, no need
> to use a mixer to adjust balance.
>
> You set up one copy of MMTTY to receive using only the left channel of a
> single sound card, and a separate copy of MMTTY to receive using only
> the right channel of the same sound card. The two operate entirely
> independently. One decodes the signal from the main receiver, the other
> one from the sub receiver. If you only want to copy one signal, just
> don't look at the output from the other copy of MMTTY, or if you find it
> distracting, just turn SUB off and/or close down the second copy of MMTTY.
>
>   From N1MM Logger, you can open two Entry windows, one for each VFO, and
> open a separate Digital Interface window from each Entry window, with
> separate copies of MMTTY each configured to use the appropriate channel
> of the sound card. You can receive on both receivers at once, and choose
> which one to transmit to with the "\" key. Or, if you only want to use
> one VFO, just close down the second Entry window.
>
> 73,
> Rich VE3KI
>
>
> NF4L wrote:
>
>> All that strikes me as a kludge, but I certainly don't have a better solution. :-(
>>

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[Joe Subich, W4TV-4]

> I just looked into MMTTY and saw (for the first time) the ability to
 > select mono, left, or right. Kewl! :-P

Yes, if you're not trying to copy both signals at the same time (e.g.,
split RTTY DX), you can use MMTTY's ability to select Left or Right
to select Main/Sub without running two copies.

73,

    ... Joe, W4TV

On 11/27/2010 10:45 AM, Mike wrote:

> I'm not suggesting mixing signals, in fact I'm trying to arrive at a method of
> conveniently eliminating one of them.
>
> I just looked into MMTTY and saw (for the first time)  the ability to select mono,
> left, or right. Kewl! :-P
>
> 73, Mike NF4L
>
>
> On 11/27/2010 9:26 AM, Joe Subich, W4TV wrote:
>>    >   I suppose the Windoze mixer could be used to set the balance. Or cut
>>    >   a wire in the audio cable.
>>
>> You don't want to mix the signals ... they would QRM each other.  I
>> can't see any reason for mixing them and running independent copies
>> of MMTTY or MixW in the dual channel mode is the best way to "select"
>> the signal.
>>
>> 73,
>>
>>       ... Joe, W4TV
>>
>> On 11/27/2010 8:58 AM, Mike wrote:
>>> Joe, if you mean stand alone MMTTY, I don't understand. I wouldn't want to copy copy
>>> both signals.
>>> Each copy of MMTTY could use a different sound card (given 2 sound cards) but still
>>> no way to direct sound by channel.
>>>
>>> I suppose the Windoze mixer could be used to set the balance. Or cut a wire in the
>>> audio cable.
>>>
>>> All that strikes me as a kludge, but I certainly don't have a better solution. :-(
>>>
>>> Mike NF4L
>>>
>>>
>>> On 11/27/2010 8:14 AM, Joe Subich, W4TV wrote:
>>> I     don't have a sub rx, so it's never been a problem for me, but I'm
>>>>>> thinking of adding one.  How does that work if there's a RTTY
>>>>>> signal on both VFO's (simplex)? Would you have to tap A>B?
>>>> The best way to handle RTTY with signals on both receivers is to run
>>>> two copies of MMTTY (or other decoder) - one for reach receiver.  MixW
>>>> has a dual receive capability - I don't know about any of the other
>>>> software.  In general, one decoder uses the soundcard left channel
>>>> and the second uses soundcard right channel audio.  Mixing the two
>>>> audio streams does not work ... it merely results in QRM.
>>>>
>>>> 73,
>>>>
>>>>         ... Joe, W4TV
>
>
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[Kok Chen]

On Nov 27, 2010, at 11/27    5:14 AM, Joe Subich, W4TV wrote:

> MixW has a dual [RTTY] receive capability - I don't know about any  
> of the other software.

On the Mac OS X side, cocoaModem has two independent receive channels  
in the "wideband RTTY" and the "dual RTTY" interfaces.  There are two  
identical sets of user interfaces in a single window -- this gets rid  
of the "window focus" problem of running multiple copies of a software  
modem.

There are two cross ellipses, independent mark and space tones, baud  
rate, and filter settings -- you can even run 75 baud and Mark-only on  
one decoder, while running 45.45 baud and Mark/Space decoding on the  
other.  In the case of "wideband RTTY," there are independent  
waterfalls.

Dual RTTY decode has been in practice in some time now.  In the old  
days, it was done with multiple TU -- this is one of the reasons why  
normally sane people have multiple HAL ST-8000 in the shack.  Just  
like other modes, having concurrent receive capability on on both the  
DX and a split pile reduces "doubling."

Using multiple TU back then required manually scanning the pileup  
using the VFO knob.  If you have a waterfall that is watching the  
pile, you can pretty much pinpoint the DX's QSX by watching where a  
signal appears in the pileup waterfall right after the DX finishes  
sending his exchange.  A software modem that is capable of agile  
transmit can then pounce on that QSX (or find the next hole in the  
direction the DX is tuning).

It used to be like shooting fish in a barrel for people with two RTTY  
decoders and agile receive (e.g., waterfall tuning) to work the split  
RTTY pileups.  Just ask RTTY DXers who have been using cocoaModem's  
"wideband RTTY" interface.

But more people have that capability today (what with the Flex-5000  
and the LP-PAN), to the point that if you don't have dual decoding and  
agile tuning capability, you are now at a distinct disadvantage.

Of course you need a sound card that has two or more inputs (or a  
digital interface like the microKeyer/digiKeyer).  Some of the cheaper  
digital interfaces are only wired for a single input channel, even  
when the codec is a stereo one.

73
Chen, W7AY

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[K2QI]

I have another question that's somewhat related to my original post.  I know
it has been discussed many times over; that one should avoid using a mono
plug in the SPKRS jack.

What I'd like to know though is this:  Would it be OK to use a mono plug in
either front panel PHONES output, or rear panel PHONE or LINE output without
fear of blowing something up?

Manual says it should be fine, but just want to get confirmation beforehand
that this is OK to do.

Tnx!

--
73 de James K2QI
President UNARC/4U1UN
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