Icom C RP1520, Instruction Manual

Page: 10 / 23

BASIC
WARNING: DISCONNECT the AC power cable from
the repeater before performing any work
on the repeater.
4-1 A FREQUENCY
The transmit and receive frequencies can be set by dip
switches on the LOGIC-A UNIT. See p. 18 for the
LOGIC-A UNIT location. See p. 19 for each switch
location.
1) Remove the bottom cover.
l Remove 6 screws on the bottom cover and another
3 screws on each side of the front panel.
2) Setting the PLL reference frequency
l Turn ON on the LOGIC-A UNIT to set the PLL
reference frequency for 5
l Turn OFF on the LOGIC-A UNIT to set the PLL
reference frequency for 12.5
l
Example of setting N-data for receiving
Receive frequency
: 147.700 MHz
1 IF frequency : 21.800 MHz (fixed)
PLL reference frequency : 0.005 MHz (5
N-data for receive frequency 1 st IF frequency
receiving
PLL reference frequency
147.700 21.8
0.005
= 25180
Set dip switches S2) at the values equivalent to
the obtained N-data.
Example of setting dip switches
Dip N-data Dip
switches value
switches
16384
8192
S l - 1 0 512
Sl-7 64
Sl-5 16
Sl-4
8
Sl-3
4 (+
Total 25180
Total
3) Setting the PLL Ndata
N-data for= receive frequency- 1 st IF frequency (MHz)
receiving
PLL reference frequency (MHz)
N-data for
transmit frequency (MHz)
transmitting PLL reference frequency (MHz)
Set the N-data obtained in the above formula by using
the dip switches. Every dip switch has an independent
volume of N-data.
NOTE: Confirm that the dip switches are correctly set,
and apply power to confirm the operating fre-
quency after replacing the bottom cover.
l
Example of setting N-data for transmiting
Transmit frequency
: 145.025 MHz
PLL reference frequency : 0.0125 MHz (12.5
for transmit frequency
transmitting reference frequency
145.025
0.0125
= 11602
Set dip switches 0) at the values equivalent to
the obtained Ndata.
Example of setting dip switches
value
8192
2048
1024
256
64
16
2 (+
11602