> 1) Are low tones OK?
Yes, if the AFSK TX Filter is enabled.
2) Can/should the AFSK TX 400-Hz DSP transmit audio filter, which is
selected in the K3's configuration?
Absolutely!
A friend just got his K3S and turning on the filter apparently
prevented the AFSK transmission, which leads me to conclude the filter
is designed for high tones.
Your friend probably failed to set the FSK/AFSK "PITCH" for the tones
in use. The AFSK TX filter is centered 85 Hz above the selected MARK
tone (915, 1275, 1445, or 2125). Attempting to use MARK other than
one of the supported frequencies (ie., "click on the waterfall") and
failing to use the selected MARK will result in no output.
The same applies to the K3 when using an external sound card.
73,
... Joe, W4TV
On 4/24/2017 5:44 PM, Jim N7US wrote:
I'm replacing my K3 with a K3S and plan to use AFSK (using the internal
soundcard) after using only FSK for many years.
I prefer listening to low tones, 1225/1445. I understand that high tones
are recommended for AFSK to prevent the possibility of transmitting the
second harmonic.
My questions are K3/K3S specific:
1) Are low tones OK?
2) Can/should the AFSK TX 400-Hz DSP transmit audio filter, which is
selected in the K3's configuration? A friend just got his K3S and turning
on the filter apparently prevented the AFSK transmission, which leads me to
conclude the filter is designed for high tones.
I use DXLab with WinWarbler as my general logger, which can use only MMTTY
to transmit RTTY. I understand that it's good to set MMTTY taps to 512 to
transmit a narrow signal, so I'll do that. I'll also consider transmitting
AFSK with 2Tone when using N1MM+.
Any other suggestions?
Thanks very much.
73, Jim N7US
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