Chapter 7: Data Channels and Data Operation
The BCM-220 works in the 219.0-220.0 MHz region designated for data in the
United States and 222.0-224.995 MHz. Channels assigned to 219.0 -220.0 can be
set up and designated as DATA ONLY using the BCM Programming software.
Frequencies 219.0-220.0 MHz are only set up for use in memory mode and thus
require the BCM Window’s based programmer. Voice transmission from the
microphone is not permitted in 219-220 MHz. Data ONLY channels are identified
on the LCD display by viewing a ‘squared I’ icon in the right corner of the display.
Interfacing a TNC or any data device to the BCM-220, requires use of the 15 pin
D-SUB accessory connector. The following table denotes the pin out for what
signals are to be applied to the correct pins.
PIN Signal
2
TX Data Input – (0-3V)
8
External PTT 3.3V: Active LOW
9
RX Audio Flat 100mV Output
10
COS Out – Carrier Off: 3.3V – On: 0V
15 GND
Pin 2 is AC coupled to the TCXO with a 4.7-uF capacitor. Therefore, direct access
to the modulator is given. This allows for transmitting a broader bandwidth
signals.
26
Summary of Contents for BCM-220
Page 1: ...BCM 220 User Manual By BridgeCom Systems Inc...
Page 27: ...APPENDIX A Terminal Description 27...
Page 31: ...NOTES 31...
