Programming from customer equipment

In the event of a customer wishing to program the STR450 receiver from his own

equipment then the following data sequence must be used allowing 5ms between the

characters in the data stream:

1200 baud, RS232 interface, 1 start bit - 8 bit data - no parity - 1 stop bit

BE (decimal 190) synchronising code

7 bit channel 0 - 127 (bit 7 = 0)

C5 (decimal 197) confirmation byte

Further details on this aspect of programming are available from Wood & Douglas,

please contact the Sales Office at the address given at the end of this instruction.

RANGE INFORMATION

The following table gives an indication of the typical ranges to be expected between a

transmitter and receiver that have simple end-fed dipole antennas.

The following assumptions have been made in the calculations:

line-of-sight between antennas

0dB gain for the transmitter and receiver antennas

0dB loss for connectors and cables between the antenna and the radio connector

20dB fade and environmental margin

-100dBm received signal strength, allowing for digital and analogue signals

Range versus TX power

Frequency (MHz)

Power (mW)

Power (dBm)

Range (km)

458.5

1mW

0

0.5

458.5

10mW

10

1.7

458.5

100mW

20

5.3

458.5

500mW

27

11.9