K3: DIG 0

[Julian, G4ILO]

I'm reading Data Modes on page 28. There are two references to "DIG 0"
which can be used for direct modulation, which I cannot find (using
search) anywhere else in the manual. What input is this?

I'm also interested in how this modulation is achieved. Years ago, I
operated RTTY with an FT-301 using a home made modem and direct
modulation. I wrote a program which sent and received 5-bit Baudot
code at 45.5 baud via the serial port. Is this what the K3 would need,
or can you send plain ASCII at a normal supported speed and the
firmware buffers it?

If the modulation is really "direct" as stated, how would direct
modulation of PSK31 be achieved, or do I misunderstand this
capability? I'm not sure I will ever need this capability (the use of
KY commands via the CAT interface seems to me to be more useful) but
it looks interesting. Everything else is going to stop the moment my
K3 arrives, that's for certain. :)
--
Julian, G4ILO K2 s/n: 392  K3 s/n: ???
G4ILO's Shack: www.g4ilo.com
Ham-Directory: www.ham-directory.com
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[Ken Wagner K3IU]

It's on the schematics as DIG0

Julian G4ILO wrote:

> I'm reading Data Modes on page 28. There are two references to "DIG 0"
> which can be used for direct modulation, which I cannot find (using
> search) anywhere else in the manual. What input is this?
>
> I'm also interested in how this modulation is achieved. Years ago, I
> operated RTTY with an FT-301 using a home made modem and direct
> modulation. I wrote a program which sent and received 5-bit Baudot
> code at 45.5 baud via the serial port. Is this what the K3 would need,
> or can you send plain ASCII at a normal supported speed and the
> firmware buffers it?
>
> If the modulation is really "direct" as stated, how would direct
> modulation of PSK31 be achieved, or do I misunderstand this
> capability? I'm not sure I will ever need this capability (the use of
> KY commands via the CAT interface seems to me to be more useful) but
> it looks interesting. Everything else is going to stop the moment my
> K3 arrives, that's for certain. :)
>  

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[Ed Muns, W0YK]

> I'm reading Data Modes on page 28. There are two references to "DIG 0"
> which can be used for direct modulation, which I cannot find (using
> search) anywhere else in the manual. What input is this?

In FSK mode, this input is the FSK keying line from your FSK TNC or FSK
computer software, e.g. MMTTY.  In the future, it will be the keying line
for other digital modes.

> I'm also interested in how this modulation is achieved. Years
> ago, I operated RTTY with an FT-301 using a home made modem
> and direct modulation. I wrote a program which sent and
> received 5-bit Baudot code at 45.5 baud via the serial port.
> Is this what the K3 would need, or can you send plain ASCII
> at a normal supported speed and the firmware buffers it?

Yes, your hardware TNC or software program needs to send the Baudot encoded
"on-off" transitions where Mark = high or open and Space = closer to ground.
There is a FSK POL menu entry in the K3 to reverse this logic if necessary
for your external keying hardware/software.

Alternatively, you can use a terminal program, or other software, to send
ASCII to the RS232 connector for FSK and other digital modes.

> If the modulation is really "direct" as stated, how would
> direct modulation of PSK31 be achieved, or do I misunderstand
> this capability?

Same way ... your external hardware or software would need to provide the
PSK-encoded "on-off" transitions.

73,
Ed - W0YK

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[Greg - AB7R]

DIG0-IN is pin 1 on the ACCY connection.  This is where you would connect your FSK
keying line for direct FSK with the K3.  This should also be the same line for direct
keying of PSK if you decide to use that.  I think most folks will use DATA-A for PSK
when using a soundcard program.  PSK-D is there  primarily for direct sending using
your CW paddles without the need of an external computer.


-------------------------
73,
Greg - AB7R
Whidbey Island WA
NA-065
K3#0009

On Thu Oct 11  8:55 , "Julian G4ILO"  sent:

>I'm reading Data Modes on page 28. There are two references to "DIG 0"
>which can be used for direct modulation, which I cannot find (using
>search) anywhere else in the manual. What input is this?
>
>I'm also interested in how this modulation is achieved. Years ago, I
>operated RTTY with an FT-301 using a home made modem and direct
>modulation. I wrote a program which sent and received 5-bit Baudot
>code at 45.5 baud via the serial port. Is this what the K3 would need,
>or can you send plain ASCII at a normal supported speed and the
>firmware buffers it?
>
>If the modulation is really "direct" as stated, how would direct
>modulation of PSK31 be achieved, or do I misunderstand this
>capability? I'm not sure I will ever need this capability (the use of
>KY commands via the CAT interface seems to me to be more useful) but
>it looks interesting. Everything else is going to stop the moment my
>K3 arrives, that's for certain. :)
>--
>Julian, G4ILO K2 s/n: 392  K3 s/n: ???
>G4ILO's Shack: www.g4ilo.com
>Ham-Directory: www.ham-directory.com
>_______________________________________________
>Elecraft mailing list
>Post to: [hidden email]
>You must be a subscriber to post to the list.
>Subscriber Info (Addr. Change, sub, unsub etc.):
> http://mailman.qth.net/mailman/listinfo/elecraft   
>
>Help: http://mailman.qth.net/subscribers.htm
>Elecraft web page: http://www.elecraft.com

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[Julian, G4ILO]

Ah. In the table on page 18 that pin is called FSK IN. Those of us who
get lost following a signal around multi-page schematics would never
have figured it out, though I suppose it would be a good guess from
the description. But then I don't always understand what *is*
explained clearly in the manual, so I try and avoid guessing. :)
Thanks for the clarification.

--
Julian, G4ILO K2 s/n: 392  K3 s/n: ???
G4ILO's Shack: www.g4ilo.com
Ham-Directory: www.ham-directory.com


On 10/11/07, Greg - AB7R <[hidden email]> wrote:
> DIG0-IN is pin 1 on the ACCY connection.
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