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PSK63 D Tones?

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scottw

PSK63 D Tones?

I am a newbie when it comes to the digital modes and the KX3. The
following question may, therefore, be naive.

I have been experimenting using my Tentec transceiver to copy and send
APRS PSK63 beacons on 30 meters using the "APRS Messenger" software.
It seems to work fine using a Signalink USB sound card with the
program set for 2100Hz tones. I am tuned to 10.147.6 USB.

I want to try using the KX3 in PSK63 D mode to do the same thing, but
don't know what tone/shift the internal modem uses, so don't know what
frequency to tune the radio to. To quote WA8LMF:

"The actual transmitted RF frequency is the indicated suppressed
carrier frequency (i.e. "dial frequency") plus the audio tone
frequency (USB) -or- the suppressed carrier frequency minus the audio
tone frequency (LSB). The actual dial frequency you want WILL DEPEND
ON THE SIDEBAND YOU CHOOSE (either one will work) --AND-- ON THE
PARTICULAR AUDIO TONE FREQUENCY produced by the PSK program."

Up until now I have been using AFSK in USB mode to do these
experiments, and don't know how that translates when using a "direct"
PSK63 mode. How should I tune the KX3 to be spot on to the single RF
frequency for 30-meter PSK63 APRS operation, which is 10.149.700 MHz?
Any advice appreciated.

-Scott N3SW-
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David Haines

Re: PSK63 D Tones?

Scott: Don't apologize for naive questions! There are plenty of us
newbies out here who appreciate
discussions about their rigs, as well as the really good answers that arise!

73,
david
New KX3 owner.
KC1DNY

On 7/16/2017 3:02 PM, richardscott w wrote:

> I am a newbie when it comes to the digital modes and the KX3. The
> following question may, therefore, be naive.
>
> I have been experimenting using my Tentec transceiver to copy and send
> APRS PSK63 beacons on 30 meters using the "APRS Messenger" software.
> It seems to work fine using a Signalink USB sound card with the
> program set for 2100Hz tones. I am tuned to 10.147.6 USB.
>
> I want to try using the KX3 in PSK63 D mode to do the same thing, but
> don't know what tone/shift the internal modem uses, so don't know what
> frequency to tune the radio to. To quote WA8LMF:
>
> "The actual transmitted RF frequency is the indicated suppressed
> carrier frequency (i.e. "dial frequency") plus the audio tone
> frequency (USB) -or- the suppressed carrier frequency minus the audio
> tone frequency (LSB). The actual dial frequency you want WILL DEPEND
> ON THE SIDEBAND YOU CHOOSE (either one will work) --AND-- ON THE
> PARTICULAR AUDIO TONE FREQUENCY produced by the PSK program."
>
> Up until now I have been using AFSK in USB mode to do these
> experiments, and don't know how that translates when using a "direct"
> PSK63 mode. How should I tune the KX3 to be spot on to the single RF
> frequency for 30-meter PSK63 APRS operation, which is 10.149.700 MHz?
> Any advice appreciated.
>
> -Scott N3SW-
> ______________________________________________________________
> 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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Don Wilhelm

Re: PSK63 D Tones?

In reply to this post by scottw

Scott,

That quote from WA8LMF refers to the actual frequency transmitted by
normal soundcard data modes (and the same is true no matter what the
data mode). Use the KX3 in DATA A for all except RTTY. Although some
data mode applications correctly send RTTY the same as other data modes,
with some like MMTTY, you would want to use AFSK A on the KX3.

DATA A is USB and it is usable for most soundcard data modes although
PSK does not care about the sideband, other soundcard data modes do care.
AFSK A defaults to LSB which is the norm for RTTY.
For AFSK A, the displayed frequency is the MARK frequency, which again
is the norm for RTTY.

PSK D and FSK D data submodes transmit and receive on the frequency
indicated on the K3 display - for those modes, you should be operating
with a narrow passband and tune with the VFO to the single station you
wish to work. Input is from keying CW characters on paddles (not with
an external keyer), or ASCII characters sent by a terminal program such
as KX3 Utility (and maybe a few others). If you have the PX3, you can
also use a USB keyboard connected to the PX3. Reception decoding is
done in the KX3 and is displayed in the VFO B area, or in the terminal
application of KX3 Utility or on the PX3. Again, you must tune to a
single signal with a narrow filter setting. Turn on CWT and get the
indicator close to center, then tap SPOT to bring it right to center for
good decoding. You can also send from KX3 message memories in PSK D or
FSK D data submodes. End your recorded message with the "IM" character
when entering the message text with the paddles or if entering messages
with KX3 Utility, end them with the "|" character. That character ends
transmit immediately. If you leave it out, there is a 4 second 'diddle
time'.

73,
Don W3FPR

On 7/16/2017 3:02 PM, richardscott w wrote: