Icom IC-720A Instruction Manual page 25

Fig. 3 Connection of separate antennas
1. A receiving pre-amplifier. (Fig. 1)
2. A separate receiver. (Fig. 2)
3. Separate receiver and transmitter antennas. (Fig. 3)
If you wish to use a receiver pre-amplifier, connect it bet-
ween the receiver input and antenna output terminals.
На separate receiver is used, connect it to the receiver
antenna output terminal. For a separate receive antenna
connect it to the receiver input terminal.
5-7-8 TRANSVERTER CONNECTION
The TRANSVERTER SCOPE (ALC) terminal can be used
for a VHF/UHF transverter INPUT/OUTPUT terminal.
The transverter's input/output frequency and signal level
should be as follows:
Transverter INPUT/OUTPUT Frequency
Input/Output Frequency
50MHz 20 ~ 24MHz
144MHz 24 ~ 26MHz
430M Hz 20 ~ 30MHz
е {Input/Output Level
Transmit (Output) : Max. 150mV across a 50 ohm load
—22—
Fig. 2 Connection of a separate receiver (After changing the internal socket)
RECEIVER
RECEIVE TRANSMIT
а
О
<>
Receive (Input) : 1uV for S/N 10dB
Also, apply transverter mode control signals to Pin 10 and
11 of the ACCESSORY socket as shown below.
In the transverter mode, the frequency display shows 1MHz
digit to 100Hz digit.
Transverter mode control signals:
(Pin 10) (Pin 11)
Ги со
= ОМ
Н = +5V (
5-7-9 SCOPE TERMINAL
Also, the TRANSVERTER SCOPE (ALC) terminal can be
used for a scope terminal (It puts out 39.7MHz IF signals of
the 1st mixer stage.) by changing internal connections.
The following is the procedure for changing internal con-