Installing Optional Electronic Keyer; Installing Optional Cw Narrow Filter - Icom IC-735 Instruction Manual

Wiring for an iambic paddle.
DOT
tl
DASH
.0.
NOTE: See page 45 for transceiver disassembly.
WEIGHT CONTROL (R2)
,e— ELECTRONIC KEYER
FROM MAIN UNIT
PA UNIT
P27
5
-
4 INSTALLING OPTIONAL
ELECTRONIC KEYER
(EXAMPLE)
You wish to operate RTTY using AFSK on 14.090MHz.
1. Place the IC-735 in the LSB mode.
2. Set the
IC
-
735
display frequency to 14.092.1MHz.
3. Apply AFSK signals (2125Hz mark, 2295Hz space) to pin 4 on
the ACC (1) connector on the rear panel of the IC-735.
This unit provides an automatic keying function with an iambic
paddle, and it is built with a single CMOS IC. Features designed into
this IC include contact debouncing, RF immunity, self-completing
character generation, dot memory and weight control. The keying
speed can be changed between 5 and 45 wpm by the MIC GAIN/
SPEED CONTROL on the switch panel of the set.
1. Install the unit into the position shown in the illustration using
the attached screws.
2. Unplug P27 which is presently connected to J23 on the PL board
(See page 44 for the location.) and connect P27 to connector, J1
(P36) on the keyer unit.
3. Plug the 4 pin connector, P28 from the PL board into J2 (P37)
on the keyer unit.
4. Connect an iambic paddle with a 3-conductor 1/4 inch key plug
as shown in the figure.
5. Check the operation of the keyer. If you would like to increase
the weight, turn the weight control on the unit clockwise for
your favorite position. See page 32 for operating instructions.
5 - 5 INSTALLING OPTIONAL
CW NARROW FILTER
OPTIONAL CW FILTER
There are two types of optional CW filters as follows:
CENTER FREQUENCY
CHARACTERISTICS
F L-32A
9.0106MHz
500Hz/-6dB, 1.6kHz/-60dB
FL-63A
9.0106MHz
250Hz/-6dB, 1.1 kHz/
-60dB
The optional filter should be installed on the MAIN unit as shown in
the picture. See page 43 for the location.