Filter
Top Products
7.0 RADIO TRANSMISSION
7.1 Radio Frequency
Hex RF Tx RF RxRF
Channel Channel Frequency Frequency SW5 SW4 SW3 SW2 SW1
02H 1 440.825 MHZ 445.825MHz ON ON ON ON OFF
04H 2 440.850 MHZ 445.850MHz ON ON ON OFF ON
06H 3 440.875 MHZ 445.875MHz ON ON ON OFF OFF
08H 4 440.900 MHZ 445.900MHz ON ON OFF ON ON
0AH 5 440.925 MHZ 445.925MHz ON ON OFF ON OFF
0CH 6 440.950 MHZ 445.950MHz ON ON OFF OFF ON
0EH 7 440.975 MHZ 445.975MHz ON ON OFF OFF OFF
10H 8 440.000 MHZ 446.000MHz ON OFF ON ON ON
12H 9 440.025 MHZ 446.025MHz ON OFF ON ON OFF
14H 10 440.050 MHZ 446.050MHz ON OFF ON OFF ON
16H 11 440.075 MHZ 446.075MHz ON OFF ON OFF OFF
18H 12 440.100 MHZ 446.100MHz ON OFF OFF ON ON
1AH 13 440.125 MHZ 446.125MHz
NOT USED FOR TELEMETRY
1CH 14 440.150 MHZ 446.150MHz ON OFF OFF OFF ON
1EH 15 440.175 MHZ 446.175MHz ON OFF OFF OFF OFF
20H 16 440.200 MHZ 446.200MHz
NOT USED FOR TELEMETRY
22H 17 440.225 MHZ 446.225MHz OFF ON ON ON OFF
7.2. Serial Port Channel Change
The RF channel can be changed by sending an ATX instruction to the serial port when the Address Mode has
been selected
ATXn
where n is the Hex Channel Number shown in the table above.
If the menu letter is set to A, then the RF frequency would be set to 458.525MHz when the modem is switched
on. This can be modified to say 458.650MHz by sending the following four hexadecimal characters to the serial
port:
A T X 0C
41 54 58 0C
No more data must be sent to the port for 20mSec while the radio sets the new frequency. CTS will be brought
low and then high to indicate the modem is busy.