31
Data Modes
You
don’
t
need
a
c
ompu
ter to get started with data
modes on the K3: it can decode and display RTTY
and PSK31 on its LCD (pg. 33). You can transmit
in data modes using your keyer paddle (see
CW -to-
DATA
, pg. 34).
Using a computer for data modes is also very
conveni
e
nt
on
t
he
K3,
as
des
cr
i
bed
bel
ow.
I
f
you’
r
e
using AMT OR or PacT OR, also see pg. 32.
Data Mode Connections
You can transmit and receive data with a computer
in three ways:
Connect your soundcard I/O to the K3. Use
MAIN:MIC SEL
to use LINE IN/OUT , front-
panel mic jack, or rear-panel mic jack. You can
use VOX or PTT to controltransmit.
Use the soundcard in receive mode, but use a
PC I/O line to do direct FSK (or PSK)
modul
at
i
on.
Connec
t
t
he
PC’
s
I
/
O
l
i
ne
t
o
t
he
“FSK
I
N”
l
i
ne
on
t
he
K3’
s
ACC
connec
t
or
.
(
I
f
this signal originates from an RS232 port, it
will require RS232-to-TTL level conversion.)
Send and receive ASCII text via the RS232
i
nt
er
f
ac
e.
To
s
end,
i
ns
er
t
t
e
xt
i
nt
o
a
“KY”
command
(
e
.
g.
,
“KY
CQ
DE
N6KR;
”
)
.
To
r
ecei
ve,
s
end
“TT1;
”
(
t
ext
-to-
t
e
r
mi
nal
)
.
“TT0;
”
t
ur
ns
i
t
of
f
.
See
t
he
K3
Pr
ogr
ammer
’
s
Reference, available at www.elecraft.com.
Data Mode Selection
Soundcard-base d data communications can be done
using LSB or USB mode. However, DAT A modes
offer several benefits not available in SSB modes.
I
f
you
pr
ef
er
t
o
us
e
LSB
or
USB,
you’
l
l
need
t
o
manually set
C MP
to
0
to prevent data signal
distortion. Refer to your data communications
software manual to determine how to set up the
VFO and computer for accurate frequency display.
To use DAT A modes, tap
MO D E
until the
DATA
icon appears. Next, hold
D AT A MD
. The present
data mode is shown on VFO B, and can be changed
by rotating the VFO B knob.
The following data modes are available:
DA TA A
can be used for all
A
udio-shift
transmit modes, including
PSK31
,
MFSK
,
AFSK
, etc. The VFO displays the suppressed-
carrier frequency, just as when SSB modes are
us
ed
f
or
dat
a.
USB
i
s
“nor
mal
”
f
or
DATA
A.
Compression is automatically set to 0.
AFS K A
also uses
A
udio-shift transmit, but is
optimized for RTT Y. The VFO displays the
RTTY
mar
k
f
r
equency,
and
LSB
i
s
“nor
mal
”.
The built-in text decoder can be used in this
mode (pg. 33), as well as the dual-tone RTTY
filter (DT F, pg. 32).
FS K D
is identical to AFSK A, except that
D
irect modulation is used, via FSK IN, ASCII,
or the keyer paddle (pg. 34). The text decoder
can be used in this mode (pg. 33), as well as the
dual-tone RTT Y filter (DTF, pg. 32).
P S K D
is a
D
irect-transmit mode for
PSK31
.
I
t
’
s
t
he
onl
y
mode
t
ha
t
decodes
and
di
s
pl
ays
PSK31 signals with the text decoder (pg. 33).
Like FSK D, PSK D lets you transmit via
FSK IN, ASCII, or the keyer paddle (pg. 34).
You can also use auto-spot with PSK D if the
tuning aid is displayed (
C W T
, pg. 34).
The
D AT A MD
display also shows the data speed in
bps on VFO A. This is relevant only if the text
decoder is on. Depending on the mode, other data
speeds may be available; select them by rotating
VFO A.
Also shown is the current sideband (
LS B
or
US B
).
I
f
t
hi
s
s
i
deband
i
s
cons
i
der
ed
“da
t
a
r
e
ver
s
e”
f
or
t
he
present mode, then
RE V
also appears. You can use
AL T
to switch to the other sideband if required.
Mark/Shift and Pitch Selection (PITCH)
Hold
P I TC H
to view and change the received mark
tone and shift (AFSK/FSK) or center pitch (PSK).
In AFSK/FSK modes, you have a choice of mark
tone/shift combinations. Use VFO A to select a
t
one/
s
hi
f
t
combi
na
t
i
on
t
hat
’
s
compa
t
i
bl
e
wi
t
h
your
software. A lower mark pitch makes signal tuning
easier when using the K3
’
s
t
e
xt
decoder
.
Summary of Contents for K3
Page 71: ...71 K3 Block Diagram ...
