Datacommunication; Swr Геайїпд; Swr Reading - Icom IC-1275A Instruction Manual

17
5 FUNCTIONS OPERATION
5-6 Data communication
Packet and AMTOR operations require a rapid transmit and
receive switching time since they are handshaking com-
munications. When [DATA] is ON, transmit and receive
switching time delay becomes faster by approx. 6 msec.
ө Using the MIC CONNECTOR
5-7 SWR reading
The transceiver has a built-in SWR meter to check the
antenna matching condition, helping you avoid problems
caused by high SWR.
1) Set the meter switch оп the front panel to the "S*RF''
position.
2) Set [TX-METER] on the rear panel to the "SET" posi-
tion.
3) Push [FM] to select FM mode.
4) Rotate [MIC GAIN] fully counterclockwise.
5) Push [XMIT] to transmit.
6) Adjust [RF PWR] to move the meter needle to "SET"
on the SWR scale.
7) Set [TX-METER] to the "SWR" position. Read the
SWR from the SWR scale.
elf the SWR is less than 1.5, the matching gondition
between the transceiver and your antenna is good.
(Rear panel view)
(Front panel view)
1) Connect TNC, RTTY or another terminal unit as shown
in the diagram below.
2) Set the switches and controls as described on p. 10.
3) Select the desired operating mode and push [DATA].
e "DATA" appears.
4) To operate the IC-1275A/E for data communications,
enter commands or data from your terminal unit.
AFSK output
AF input
SQUELCH input
PTT
Ground (GND)
AFSK TERMINAL UNIT
Tm | Loo
ооо
С
IS
TX-METER
RF SET SWR
Adjust to "SET" position with
[RF PWR].
ТХ - METER 5 7 9 «20dB
т А
1
RF SET SWR
The SWR should be less than 1.5.