E Rtty Mode Operation - Icom IC-707 Instruction Manual

21
3 OPERATION
Mi RTTY mode operation
Connect a TNC with RTTY capability to
the [ACC(1)] socket on the rear panel.
Personal computer
TNC with RTTY
capability
AF input and output levels
Your TNC (Terminal Node Controller) should be
connected to the [ACC(1)] socket. . Refer to p. 12
and your TNC instruction manual for connection.
When connected to the [MIC] connector, rotate the
[AF] control and the [MIC] control to obtain suitable
levels. Suitable levels vary according to your TNC.
Basic RTTY mode operation
% NOTE: Operation varies according to your
equipment. Refer to your TNC instruction man-
Y, ual for details.
1) Turn the [POWER] switch to the ON position.
2) Push the [MODE] switch several times until
"LSB" appears.
3) Rotate the main dial to select an operating fre-
quency in the allowed range for RTTY mode.
Operating frequency for RTTY mode
RTTY operating frequency differs from the displayed
frequency. When the oscillated frequencies of your
TNC are:
Mark = 2125 Hz
Space = 2295 Hz
0006
[ACC (1)] socket
— AF output level from pin 5 is fixed regardless of
the [AF] control position.
— AF input level to pin 4 is fixed regardless of the
[MIC] control position.
[MIC] connector ©
— AF output level from pin 8 varies according to the
[AF] control position.
— AF input level to pin 1 varies according to the
[MIC] control position.
4) When an optional HF automatic antenna tuner is
connected operate as following:
— AH-3 : Push and hold the [TUNER] switch.
(p. 23)
— AT-160 : lf SWR is high, push the [TUNER]
switch. (p. 24)
5) If your TNC requires, rotate the [SQL] control to
the 12 o'clock position to mute noise.
6) If required, activate the RIT function, preamp,
attenuator or noise blanker.
e Refer to p. 18 for details.
7) If required, rotate the [RF PWR] control to adjust
the RF output power level.
8) Use the keyboard to transmit.
'Refer to the following formula for RTTY operating
frequency.
Operating freq. = Displayed freq. — 2125 Hz
[Frequency setting example]
When operating at 14.090 MHz, rotate the main dial
to select 14.0921 MHz on the function display.