Bird Technologies 11-70 Series - Manual (Page 14)

Bird Technologies Group TX RX Systems Inc.
100
90
80
70
60
50
40
.2 .3 .4 .5 .6 .7 .8 .9 1 2 3 4 5 6 7 8 9 10
132 - 174 MHz Band
A
tt
e
n
u
a
ti
o
n
Frequency Separation (MHz)
.2 .3 .4 .5 .6 .7 .8 .9 1 2 3 4 5 6 7 8 9 10
Frequency Separation (MHz)
100
90
80
70
60
50
40
400 - 512 MHz Band
A
tt
e
n
u
a
ti
o
n
Isolation Curves for Transmitter/Receiver
These are only "typical" curves. When accuracy is required, consult the radio manufacturer.
NOTE
The curves shown below for use with filters, duplexers, and multicouplers, indicate the
amount of isolation or attenuation required between a typical 100 watt transmitter and its
associated receiver at the TX (carrier suppression) and RX (noise suppression) frequency
which will result in no more than a 1 dB degradation of the 12 dB SINAD sensitivity.
For TX Power of:
25 watts -
50 watts -
100 watts -
250 watts -
350 watts -
subtract 6 dB
subtract 3 dB
no correction
add 4 dB
add 5.5 dB
For TX Power of:
25 watts -
50 watts -
100 watts -
250 watts -
350 watts -
subtract 6 dB
subtract 3 dB
no correction
add 4 dB
add 5.5 dB