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K3 DATA A vs USB for JT65/JT9

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k5oai

K3 DATA A vs USB for JT65/JT9

I have been running DATA A with my SignaLink USB for JT65 & JT9 using
WSJT-X. However I am now having some problems (interfacing with other
rig control software) that are making me question why I settled on DATA
A rather than USB?

Other than the fact DATA A inherently eliminates all potential audio
settings that might cause problems if USB was used, which seems like a
big plus to me.

Are there any other reasons why DATA A is preferred for the data modes?

I have run DATA A successfully for at least 5-6 years and being a
creature of habit, I hate to switch to USB unless I am forced to.

Anyone have convincing arguments pro or con about this question I am
willing to hear them.

P.S.
I also use DATA A with Fldigi for PSK/RTTY/Olivia/etc

--
GB & 73
K5OAI
Sam Morgan
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Jim Brown-10

Re: K3 DATA A vs USB for JT65/JT9

On Mon,3/16/2015 5:43 PM, Sam Morgan wrote:
> I have run DATA A successfully for at least 5-6 years and being a
> creature of habit, I hate to switch to USB unless I am forced to.

Hi Sam,

I can't think of a single good reason to use USB for data modes. Stick
with DATA A, which IS optimized for all the data modes except AFSK (and
that's because AFSK RTTY uses LSB).

73, Jim K9YC
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vk2rq

Re: K3 DATA A vs USB for JT65/JT9

You can use DATA-A to do LSB too. I do this when I set up the KX3 for packet radio, because it places the LO just nicely so I can also monitor the local CW calling channel and my club's SSB frequency, using a separate SDR app on my PC.

73, Matt VK2RQ

> On 17 Mar 2015, at 12:04 pm, Jim Brown <[hidden email]> wrote:
>
>> On Mon,3/16/2015 5:43 PM, Sam Morgan wrote:
>> I have run DATA A successfully for at least 5-6 years and being a creature of habit, I hate to switch to USB unless I am forced to.
>
> Hi Sam,
>
> I can't think of a single good reason to use USB for data modes. Stick with DATA A, which IS optimized for all the data modes except AFSK (and that's because AFSK RTTY uses LSB).
>
> 73, Jim K9YC
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Don Wilhelm-4

Re: K3 DATA A vs USB for JT65/JT9

In reply to this post by k5oai

Sam,

You are doing it right.

DATA A mode is like SSB with the following exceptions:
1) TX EQ is disabled in DATA A mode
2) Audio compression is disabled in DATA A mode.
3) one can set the audio input to LINE IN for DATA A mode - no need to
change it from MIC audio when using data modes.

Either of those conditions may be present in SSB mode, and the first 2
will distort a data mode signal. So the answer is to use DATA A mode
instead of SSB so you do not have to manually turn off those 2
conditions when running data modes in SSB mode.
Unfortunately, some data mode software does not include recognition of
the K3/KX3 DATA A mode and will force the rig to SSB mode. Be watchful
of that condition and respond accordingly.

The K3 offers a seamless solution to the use of both SSB and Data modes
and is beneficial as long as you do not have to "fight" with the data
mode software application to get that to happen.

73,
Don W3FPR

On 3/16/2015 8:43 PM, Sam Morgan wrote:

> I have been running DATA A with my SignaLink USB for JT65 & JT9 using
> WSJT-X. However I am now having some problems (interfacing with other
> rig control software) that are making me question why I settled on
> DATA A rather than USB?
>
> Other than the fact DATA A inherently eliminates all potential audio
> settings that might cause problems if USB was used, which seems like a
> big plus to me.
>
> Are there any other reasons why DATA A is preferred for the data modes?
>
> I have run DATA A successfully for at least 5-6 years and being a
> creature of habit, I hate to switch to USB unless I am forced to.
>
> Anyone have convincing arguments pro or con about this question I am
> willing to hear them.
>
> P.S.
> I also use DATA A with Fldigi for PSK/RTTY/Olivia/etc
>
>

k6dgw

Re: K3 DATA A vs USB for JT65/JT9

Can you 'splain the difference between AFSK and DATA A? I have been
running RTTY in AFSK using MMTTY and the sound in/out from my "radio
laptop." Just two stereo cables using LINE IN/OUT on the back of the
K3, no other interface hardware. VOX for PTT. It seems to work fine,
am I missing something?

73,

Fred K6DGW
- Northern California Contest Club
- CU in the 50th Running of the Cal QSO Party 3-4 Oct 2015
- www.cqp.org

On 3/16/2015 7:55 PM, Don Wilhelm wrote:
> Sam,
>
> You are doing it right.
>
> DATA A mode is like SSB with the following exceptions:
> 1) TX EQ is disabled in DATA A mode
> 2) Audio compression is disabled in DATA A mode.
> 3) one can set the audio input to LINE IN for DATA A mode - no need to
> change it from MIC audio when using data modes.

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Joe Subich, W4TV-4

Re: K3 DATA A vs USB for JT65/JT9

On 2015-03-17 12:41 PM, Fred Jensen wrote:
> Can you 'splain the difference between AFSK and DATA A?

AFSK A and DATA A are both audio modes. AFSK A uses LSB
and FC is set to MARK - 85 Hz (the center of the two RTTY
Tones). DATA A is USB and FC is set to 1500 Hz (the center
of the transmit audio passband [200 - 2800 Hz]).

AFSK A also allows use of the AFSK transmit filter (a tight
filter around the Mark/Space tones to eliminate hum/pops/etc.)
and the use of the Dual Tone filter on receive.

73,

... Joe, W4TV

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Mike Reublin NF4L

Re: K3 DATA A vs USB for JT65/JT9

In reply to this post by k6dgw

Per page 31 of the K3 owners manual sez....

DATA A can be used for all audio-shift transmission modes, including AFSK and PSK-31. VFO A shows the transmit suppressed carrier frequency and USB is normal for DATA A. Compression is automatically set to 0 to reduce transmitted signal distortion.

AFSK A is also an audio-shift transmission but is optimized for RTTY. VFO A displays the RTTY mark frequency and LSB is normal. The built-in text decoder and the dual-passband RTTY filter can be used.

73, Mike NF4L

> On Mar 17, 2015, at 12:41, Fred Jensen <[hidden email]> wrote:
>
> Can you 'splain the difference between AFSK and DATA A? I have been running RTTY in AFSK using MMTTY and the sound in/out from my "radio laptop." Just two stereo cables using LINE IN/OUT on the back of the K3, no other interface hardware. VOX for PTT. It seems to work fine, am I missing something?
>
> 73,
>
> Fred K6DGW
> - Northern California Contest Club
> - CU in the 50th Running of the Cal QSO Party 3-4 Oct 2015
> - www.cqp.org
>
> On 3/16/2015 7:55 PM, Don Wilhelm wrote:
>> Sam,
>>
>> You are doing it right.
>>
>> DATA A mode is like SSB with the following exceptions:
>> 1) TX EQ is disabled in DATA A mode
>> 2) Audio compression is disabled in DATA A mode.
>> 3) one can set the audio input to LINE IN for DATA A mode - no need to
>> change it from MIC audio when using data modes.
>
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k6dgw

K3 DATA A vs AFSK A

In reply to this post by Joe Subich, W4TV-4

Hmmm ... this may be the first time Fred Cady's book has failed me. I
understand now "what" each mode does. What's still not clear is "why
would I choose one over the other?" Operator/User manuals tend not to
answer that question, they are understandably focused on exactly how to
operate the equipment.

I'm very sure that, when I first set up RTTY, I went to AFSK A because I
knew what audio frequency shift keying was and I didn't know what DATA A
was. It all worked, so I never changed it or tried out the other
choice. I guess if AFSK A is LSB and works with MMTTY in its default
configuration, then DATA A is USB and I'd have to reverse the tones in
MMTTY.

I'll leave it as I've been using it, it works so it obviously doesn't
need fixing. I was just curious. I have my "pitch" set at 915 Hz, I
can't hear 2,125 Hz. Thanks Joe and Mike.

73,

Fred K6DGW
- Northern California Contest Club
- CU in the 50th Running of the Cal QSO Party 3-4 Oct 2015
- www.cqp.org

On 3/17/2015 10:07 AM, Joe Subich, W4TV wrote:

>
> On 2015-03-17 12:41 PM, Fred Jensen wrote:
> > Can you 'splain the difference between AFSK and DATA A?
>
> AFSK A and DATA A are both audio modes. AFSK A uses LSB
> and FC is set to MARK - 85 Hz (the center of the two RTTY
> Tones). DATA A is USB and FC is set to 1500 Hz (the center
> of the transmit audio passband [200 - 2800 Hz]).
>
> AFSK A also allows use of the AFSK transmit filter (a tight
> filter around the Mark/Space tones to eliminate hum/pops/etc.)
> and the use of the Dual Tone filter on receive.

Joe Subich, W4TV-4

Re: K3 DATA A vs AFSK A

Note: in my comment below Mark-85 Hz should be MARK+85 Hz as AFSK A
(LSB) reverses the sense of the tones - Mark is the lower of the two
audio tones but the higher of the RF frequencies.

73,

... Joe, W4TV

On 2015-03-17 6:48 PM, Fred Jensen wrote:

> Hmmm ... this may be the first time Fred Cady's book has failed me. I
> understand now "what" each mode does. What's still not clear is "why
> would I choose one over the other?" Operator/User manuals tend not to
> answer that question, they are understandably focused on exactly how to
> operate the equipment.
>
> I'm very sure that, when I first set up RTTY, I went to AFSK A because I
> knew what audio frequency shift keying was and I didn't know what DATA A
> was. It all worked, so I never changed it or tried out the other
> choice. I guess if AFSK A is LSB and works with MMTTY in its default
> configuration, then DATA A is USB and I'd have to reverse the tones in
> MMTTY.
>
> I'll leave it as I've been using it, it works so it obviously doesn't
> need fixing. I was just curious. I have my "pitch" set at 915 Hz, I
> can't hear 2,125 Hz. Thanks Joe and Mike.
>
> 73,
>
> Fred K6DGW
> - Northern California Contest Club
> - CU in the 50th Running of the Cal QSO Party 3-4 Oct 2015
> - www.cqp.org
>
> On 3/17/2015 10:07 AM, Joe Subich, W4TV wrote:
>>
>> On 2015-03-17 12:41 PM, Fred Jensen wrote:
>> > Can you 'splain the difference between AFSK and DATA A?
>>
>> AFSK A and DATA A are both audio modes. AFSK A uses LSB
>> and FC is set to MARK - 85 Hz (the center of the two RTTY
>> Tones). DATA A is USB and FC is set to 1500 Hz (the center
>> of the transmit audio passband [200 - 2800 Hz]).
>>
>> AFSK A also allows use of the AFSK transmit filter (a tight
>> filter around the Mark/Space tones to eliminate hum/pops/etc.)
>> and the use of the Dual Tone filter on receive.
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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> Post: mailto:[hidden email]
>
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> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]
>

Jim Brown-10

Re: K3 DATA A vs AFSK A

In reply to this post by k6dgw

On Tue,3/17/2015 3:48 PM, Fred Jensen wrote:
> What's still not clear is "why would I choose one over the other?"
> Operator/User manuals tend not to answer that question, they are
> understandably focused on exactly how to operate the equipment.

Hi Fred,

AFSK A and FSK are for RTTY. They are set up to put the other guy's
signal in the passband of the RX IF, so we can use filters on it. It's
for "single-frequency", like we would do with MMTTY. You want to work a
different station, you tune the big knob.

DATA A is for digital software that has a multi-decoder function -- it
decodes all the signals it can find in the 2.7 kHz bandwidth of an SSB
rig. If we listen to the speaker (or headphones), we hear a bunch of
signals, not only one. The usual computer display is spectrum and
waterfall, similar to the P3. We choose which one we want to work by
clicking on the decode string.

I use AFSK for RTTY and DATA A for everything else. For non-contest RTTY
operation, I use WinWarbler, which is a sort of package for MMTTY, and
allows a 2Tone window.

73, Jim K9YC

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Don Wilhelm-4

Re: K3 DATA A vs AFSK A

In reply to this post by k6dgw

Which data sub-mode is used is really a user's choice and is dependent
on what data mode software is intended to be used. Some waterfall
display oriented data mode software will do fine sending and decoding
RTTY as well as other data modes. MMTTY (which is the main choice for
RTTY operation) does not do a waterfall and you tune to the signal
desired with the VFO. A similar situation is true for PSK D and FSK D -
you tune to the desired station with the VFO rather than clicking on a
waterfall display.

For those who are not clear about the data sub-mode designations try this:
DATA A = Data mode (Audio) = waterfall display oriented (point and click)
AFSK A = AFSK mode (Audio) = Tune in a single station with the VFO
PSK D = PSK mode (Digital) = send CW with paddles (or ASCII in KY
command), receive on K2 display or K3 Utility terminal
FSK D = FSK mode (Digital) = send CW with paddles (or ASCII in KY
command or 'wiggling the FSK IN pin on the ACC jack), receive on K2
display or K3 Utility terminal

Hopefully that helps with understanding of what the "A" and "D" suffixes
mean.

In summary, if you are using an application that has a waterfall
display, use DATA A and point and click on the waterfall to select the
station.
How you use the data sub-modes depends on which software application you
are using as well as the physical connections to the K3.

73,
Don W3FPR

On 3/17/2015 6:48 PM, Fred Jensen wrote:

> Hmmm ... this may be the first time Fred Cady's book has failed me. I
> understand now "what" each mode does. What's still not clear is "why
> would I choose one over the other?" Operator/User manuals tend not to
> answer that question, they are understandably focused on exactly how
> to operate the equipment.
>
> I'm very sure that, when I first set up RTTY, I went to AFSK A because
> I knew what audio frequency shift keying was and I didn't know what
> DATA A was. It all worked, so I never changed it or tried out the
> other choice. I guess if AFSK A is LSB and works with MMTTY in its
> default configuration, then DATA A is USB and I'd have to reverse the
> tones in MMTTY.
>
> I'll leave it as I've been using it, it works so it obviously doesn't
> need fixing. I was just curious. I have my "pitch" set at 915 Hz, I
> can't hear 2,125 Hz. Thanks Joe and Mike.
>
> 73,
>
> Fred K6DGW
> - Northern California Contest Club
> - CU in the 50th Running of the Cal QSO Party 3-4 Oct 2015
> - www.cqp.org
>
> On 3/17/2015 10:07 AM, Joe Subich, W4TV wrote:
>>
>> On 2015-03-17 12:41 PM, Fred Jensen wrote:
>> > Can you 'splain the difference between AFSK and DATA A?
>>
>> AFSK A and DATA A are both audio modes. AFSK A uses LSB
>> and FC is set to MARK - 85 Hz (the center of the two RTTY
>> Tones). DATA A is USB and FC is set to 1500 Hz (the center
>> of the transmit audio passband [200 - 2800 Hz]).
>>
>> AFSK A also allows use of the AFSK transmit filter (a tight
>> filter around the Mark/Space tones to eliminate hum/pops/etc.)
>> and the use of the Dual Tone filter on receive.
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]
>

Lynn W. Taylor, WB6UUT

Re: K3 DATA A vs AFSK A

In reply to this post by Joe Subich, W4TV-4

... and it should be LSB because everyone knows: Low Space Means Fine
Teletype.

On 3/17/2015 4:00 PM, Joe Subich, W4TV wrote:

>
> Note: in my comment below Mark-85 Hz should be MARK+85 Hz as AFSK A
> (LSB) reverses the sense of the tones - Mark is the lower of the two
> audio tones but the higher of the RF frequencies.
>
> 73,
>
> ... Joe, W4TV
>
>
> On 2015-03-17 6:48 PM, Fred Jensen wrote:
>> Hmmm ... this may be the first time Fred Cady's book has failed me. I
>> understand now "what" each mode does. What's still not clear is "why
>> would I choose one over the other?" Operator/User manuals tend not to
>> answer that question, they are understandably focused on exactly how to
>> operate the equipment.
>>
>> I'm very sure that, when I first set up RTTY, I went to AFSK A because I
>> knew what audio frequency shift keying was and I didn't know what DATA A
>> was. It all worked, so I never changed it or tried out the other
>> choice. I guess if AFSK A is LSB and works with MMTTY in its default
>> configuration, then DATA A is USB and I'd have to reverse the tones in
>> MMTTY.
>>
>> I'll leave it as I've been using it, it works so it obviously doesn't
>> need fixing. I was just curious. I have my "pitch" set at 915 Hz, I
>> can't hear 2,125 Hz. Thanks Joe and Mike.
>>
>> 73,
>>
>> Fred K6DGW
>> - Northern California Contest Club
>> - CU in the 50th Running of the Cal QSO Party 3-4 Oct 2015
>> - www.cqp.org
>>
>> On 3/17/2015 10:07 AM, Joe Subich, W4TV wrote:
>>>
>>> On 2015-03-17 12:41 PM, Fred Jensen wrote:
>>> > Can you 'splain the difference between AFSK and DATA A?
>>>
>>> AFSK A and DATA A are both audio modes. AFSK A uses LSB
>>> and FC is set to MARK - 85 Hz (the center of the two RTTY
>>> Tones). DATA A is USB and FC is set to 1500 Hz (the center
>>> of the transmit audio passband [200 - 2800 Hz]).
>>>
>>> AFSK A also allows use of the AFSK transmit filter (a tight
>>> filter around the Mark/Space tones to eliminate hum/pops/etc.)
>>> and the use of the Dual Tone filter on receive.
>>
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:[hidden email]
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>> Message delivered to [hidden email]
>>
> ______________________________________________________________
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NK7Z

Re: K3 DATA A vs AFSK A

LSMFT had several other meanings... :)
--
Thanks and 73's,
For equipment, and software setups and reviews see:
www.nk7z.net
for MixW support see;
http://groups.yahoo.com/neo/groups/mixw/info
for Dopplergram information see:
http://groups.yahoo.com/neo/groups/dopplergram/info
for MM-SSTV see:
http://groups.yahoo.com/neo/groups/MM-SSTV/info

On Tue, 2015-03-17 at 17:47 -0700, Lynn W. Taylor, WB6UUT wrote:

> ... and it should be LSB because everyone knows: Low Space Means Fine
> Teletype.
>
> On 3/17/2015 4:00 PM, Joe Subich, W4TV wrote:
> >
> > Note: in my comment below Mark-85 Hz should be MARK+85 Hz as AFSK A
> > (LSB) reverses the sense of the tones - Mark is the lower of the two
> > audio tones but the higher of the RF frequencies.
> >
> > 73,
> >
> > ... Joe, W4TV
> >
> >
> > On 2015-03-17 6:48 PM, Fred Jensen wrote:
> >> Hmmm ... this may be the first time Fred Cady's book has failed me. I
> >> understand now "what" each mode does. What's still not clear is "why
> >> would I choose one over the other?" Operator/User manuals tend not to
> >> answer that question, they are understandably focused on exactly how to
> >> operate the equipment.
> >>
> >> I'm very sure that, when I first set up RTTY, I went to AFSK A because I
> >> knew what audio frequency shift keying was and I didn't know what DATA A
> >> was. It all worked, so I never changed it or tried out the other
> >> choice. I guess if AFSK A is LSB and works with MMTTY in its default
> >> configuration, then DATA A is USB and I'd have to reverse the tones in
> >> MMTTY.
> >>
> >> I'll leave it as I've been using it, it works so it obviously doesn't
> >> need fixing. I was just curious. I have my "pitch" set at 915 Hz, I
> >> can't hear 2,125 Hz. Thanks Joe and Mike.
> >>
> >> 73,
> >>
> >> Fred K6DGW
> >> - Northern California Contest Club
> >> - CU in the 50th Running of the Cal QSO Party 3-4 Oct 2015
> >> - www.cqp.org
> >>
> >> On 3/17/2015 10:07 AM, Joe Subich, W4TV wrote:
> >>>
> >>> On 2015-03-17 12:41 PM, Fred Jensen wrote:
> >>> > Can you 'splain the difference between AFSK and DATA A?
> >>>
> >>> AFSK A and DATA A are both audio modes. AFSK A uses LSB
> >>> and FC is set to MARK - 85 Hz (the center of the two RTTY
> >>> Tones). DATA A is USB and FC is set to 1500 Hz (the center
> >>> of the transmit audio passband [200 - 2800 Hz]).
> >>>
> >>> AFSK A also allows use of the AFSK transmit filter (a tight
> >>> filter around the Mark/Space tones to eliminate hum/pops/etc.)
> >>> and the use of the Dual Tone filter on receive.
> >>
> >> ______________________________________________________________
> >> Elecraft mailing list
> >> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> >> Help: http://mailman.qth.net/mmfaq.htm
> >> Post: mailto:[hidden email]
> >>
> >> This list hosted by: http://www.qsl.net
> >> Please help support this email list: http://www.qsl.net/donate.html
> >> Message delivered to [hidden email]
> >>
> > ______________________________________________________________
> > Elecraft mailing list
> > Home: http://mailman.qth.net/mailman/listinfo/elecraft
> > Help: http://mailman.qth.net/mmfaq.htm
> > Post: mailto:[hidden email]
> >
> > This list hosted by: http://www.qsl.net
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> > Message delivered to [hidden email]
> >
>
> ______________________________________________________________
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Charlie T, K3ICH

Re: K3 DATA A vs AFSK A

So does "shift, plus, question mark" as in "^+?"

Anybody wanna take a shot at what THAT means ?

Charlie k3ICH

----- Original Message -----
From: "David Cole" <[hidden email]>
To: <[hidden email]>
Sent: Wednesday, March 18, 2015 12:17 AM
Subject: Re: [Elecraft] K3 DATA A vs AFSK A

> LSMFT had several other meanings... :)
> --
> Thanks and 73's,
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> On Tue, 2015-03-17 at 17:47 -0700, Lynn W. Taylor, WB6UUT wrote:
>> ... and it should be LSB because everyone knows: Low Space Means Fine
>> Teletype.
>>
>> On 3/17/2015 4:00 PM, Joe Subich, W4TV wrote:
>> >
>> > Note: in my comment below Mark-85 Hz should be MARK+85 Hz as AFSK A
>> > (LSB) reverses the sense of the tones - Mark is the lower of the two
>> > audio tones but the higher of the RF frequencies.
>> >
>> > 73,
>> >
>> > ... Joe, W4TV
>> >
>> >
>> > On 2015-03-17 6:48 PM, Fred Jensen wrote:
>> >> Hmmm ... this may be the first time Fred Cady's book has failed me. I
>> >> understand now "what" each mode does. What's still not clear is "why
>> >> would I choose one over the other?" Operator/User manuals tend not to
>> >> answer that question, they are understandably focused on exactly how
>> >> to
>> >> operate the equipment.
>> >>
>> >> I'm very sure that, when I first set up RTTY, I went to AFSK A because
>> >> I
>> >> knew what audio frequency shift keying was and I didn't know what DATA
>> >> A
>> >> was. It all worked, so I never changed it or tried out the other
>> >> choice. I guess if AFSK A is LSB and works with MMTTY in its default
>> >> configuration, then DATA A is USB and I'd have to reverse the tones in
>> >> MMTTY.
>> >>
>> >> I'll leave it as I've been using it, it works so it obviously doesn't
>> >> need fixing. I was just curious. I have my "pitch" set at 915 Hz, I
>> >> can't hear 2,125 Hz. Thanks Joe and Mike.
>> >>
>> >> 73,
>> >>
>> >> Fred K6DGW
>> >> - Northern California Contest Club
>> >> - CU in the 50th Running of the Cal QSO Party 3-4 Oct 2015
>> >> - www.cqp.org
>> >>
>> >> On 3/17/2015 10:07 AM, Joe Subich, W4TV wrote:
>> >>>
>> >>> On 2015-03-17 12:41 PM, Fred Jensen wrote:
>> >>> > Can you 'splain the difference between AFSK and DATA A?
>> >>>
>> >>> AFSK A and DATA A are both audio modes. AFSK A uses LSB
>> >>> and FC is set to MARK - 85 Hz (the center of the two RTTY
>> >>> Tones). DATA A is USB and FC is set to 1500 Hz (the center
>> >>> of the transmit audio passband [200 - 2800 Hz]).
>> >>>
>> >>> AFSK A also allows use of the AFSK transmit filter (a tight
>> >>> filter around the Mark/Space tones to eliminate hum/pops/etc.)
>> >>> and the use of the Dual Tone filter on receive.
>> >>
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