33
Advanced Operating Features
Text Decode And Display
The K3 can decode CW, PSK31 and RTTY.
Decoded text is displayed on VFO B. In data
modes, you can use the K3’s internal keyer to
transmit PSK31 and RTTY signals (pg. 34).
When text decode is enabled, turningthe
RIT/XIT offset control does not flashthe offset
value. This would disrupt thetext display.
CW Text Decode Setup
To set up CW text decode:
Set MODE to CW.
If a special VFO B display mode is in effect,
cancel it by tapping DISP .
Hold TEXT D EC , then select CW 5-40
(lower WPM range) using VFO B. Below the
CW icon you should see a T, showing that
text decode is enabled. The TX ONLY setting
decodes only CW you send (internal keyer); the
T does not appear in thiscase.
Adjust thethreshold (THR) using VFO A. Start
with AUTO. Manual settings (1-30) improve
copy in many cases (see below). Tap C WT to
exit text-decode setup.
You’ll probably want to turn on C W T as a
tuning aid (pg. 34).This also enables auto-spot.
CW Text Decode Tips:
SPOT (or auto-spot) a signal first, then tune
slowly until recognizable words appear.
In difficult conditions, reduce WI D TH to as
low as 50 Hz (100-200 Hz for faster CW).
To optimize text decode, use manual threshold
settings. Start with THR 5. With CW T on,
adjust the threshold sothat the CWT bar
flashes in sync with the received CW signal.
To decode very fast CW, use CW 30-90.
The K3 uses slow AGC during CW text decode,
overriding the selected AGC setting.
DATA Text Decode Setup
To set up text decode for DATA modes:
Set MODE to DATA. Then hold D ATA MD
and select either AFSK A, FSK D, or PSK D
mode using VFO B. Tap AFX to exit the data-
mode display.
For AFSK A or FSK D, hold PI TCH and
select the desired mark/shift setting. The lowest
marktone selection (915 Hz) may be more
pleasant to listen to than higher tones. (The
pitch for PSK D mode is fixed at 1000 Hz.)
Tap SPOT to exit the pitch display.
Hold TEXT D EC , then select ON using VFO
B. Below the DATA icon you should now see a
T, showingthat text decode is enabled.
Adjust thethreshold (THR) using VFO A. Start
with THR 0. Higher settings prevent text
decode on weak signalsor noise. Tap CWT to
exit text-decode setup.
You’ll probably want to turn on C W T as a
tuning aid (pg. 34).This also enables auto-spot
(applicable to PSK31 but not RTTY).
DATA Mode Text Decode Tips:
Use F INE tuning with PSK D. SPOT (or
auto-spot) a signal first,then tune slowly in 1-
Hz steps until recognizable words appear.
If you call CQ using PSK31 mode, keep RIT on
so you can fine-tune responding stations
without moving your transmit frequency.
In difficult conditions, reduce WI D TH to
the per-mode minimum (typically 50 Hz for
PSK31, 200 Hz for narrow-shift RTTY).
In AFSK A and FSK A modes, the RTTY
dual-tone filter may help (DTF, pg. 32).
RTTYtext may shift to figures due to noise.
If you assign CONFIG:TTY LTR to a
programmable function switch, you can tap it
to quickly shift back to letters.
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