FT-920 Operating Manual
18
4. CW Key/Paddle and Computer
Keying Interface Suggestions
Features
The FT-920 includes a host of features for the CW
operator, the functions of which will be detailed in the
“Operation” section later. These include:
A built-in electronic keyer with message
memory;
A front-panel K
EY
jack for connection of a keyer
paddle; and
A rear-panel K
EY
jack which may be connected
to another keyer paddle
or a straight key, TNC,
or computer CW keying interface (for use with
contest software, etc.).
Both K
EY
jacks on the FT-920 utilize “positive” key-
ing voltage. Key-up voltage is approxi5V DC,
and key-down current is approximately 0.5 mA. When
connecting a key or other device to the K
EY
jacks,
use
only a 3-pin (“stereo”) ¼” phone plug; a 2-pin
plug will place a short between the ring and
(grounded) shaft of the plug, resulting in a constant
“key-down” condition in some circumstances.
Configuration Suggestions
For everyday operation using the internal elec-
tronic memory keyer, connect your paddle to the
front panel K
EY
jack, and activate the front panel
K
EYER
switch. If you wish to keep the keyer
paddle’s cable out of the way, connect the plug,
instead, to the rear panel K
EY
jack, and set the
rear-panel P
DL
-K
EY
switch to P
DL
.
If two operators are using the FT-920 simulta-
neously (for a contest, Field Day, etc.), a second
keyer paddle may be connected to the
rear panel
K
EY
jack. Be sure that the rear panel’s P
DL
-K
EY
switch is set to P
DL
so that both operators have
access to the internal electronic memory keyer,
and switch the front panel K
EYER
switch on.
If two operators are using the FT-920 simulta-
neously, but both wish to use a straight key, “bug,”
or an outboard electronic keyer, the key plugs may
be inserted into the front and rear panel K
EY
jacks;
now turn the front panel’s K
EYER
switch off. Irre-
spective of the setting of the P
DL
-K
EY
switch, the
tip connections on both Key plugs will serve as
“Straight Key” lines for accommodating this appli-
cation.
If you are using a computer-driven CW keying in-
terface (with contest software), but want to be able
to send occasional “repeat” messages quickly
using the FT-920’s
internal keyer, connect your
keyer paddle to the front panel K
EY
jack, and the
keying interface line (which emulates a straight
key) to the
rear panel K
EY
jack. In this configura-
tion, set the rear panel’s P
DL
-K
EY
switch to the
K
EY
position, which re-configures
only the rear
panel’s K
EY
jack to accept a “Manual” keying line.
Note that the rear-panel K
EY
jack carries the capabil-
ity to support an external PTT line, if provided by your
external keyer, TNC, or computer keying interface.
y
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