Lecture
Table A2.1 – Coefficients of approximating models
|
Modulation type |
Segment number of approximation, i |
Width of the approximated segment |
Power level at the start of the i-th segment relative to the maximum emission |
Rate of change of the envelope over the i-th segment Ai |
|
AM |
0 1 2 |
0.1Bocc 0.5Bocc Bocc |
0 0 -40 |
0 -133 -67 |
|
AM telephony |
0 1 2 3 |
1 10 100 4000 |
-28 -28 0 -11 |
0 -28 -7 -60 |
|
FM |
0 1
|
0.1Bocc 0.5Bocc |
0 0 -100 |
0 -333 0 |
|
PM |
0 1 2 |
1/(10) 1/(+) 1/ |
0 0 -20lg(1+/) |
0 -20 -40 |
This table uses the following notation: Bocc – occupied frequency band, – pulse duration at the 0.5 level; pulse edge (rise time) duration. If information on Bocc is not available, this value is replaced in calculations by Bn .
Table A2.2 – Parameters of the spurious emission spectrum model
|
Transmitter operating frequency |
Coefficients and RMS deviation of modes f < f0T f = f0T |
if f >f0T |
|
|||
|
A, dB/decade |
B, dB T, dB |
A=0 |
A, dB/decade |
B, dB |
T, dB |
|
|
f0T<30 MHz |
20 |
-80 10 |
-70 |
-20 |
10 |
|
|
30<f0T<300 MHz f0T>300 MHz Overall, across all |
20 20 20 |
-80 10 -80 10 -80 10 |
B=0 =2 dB |
-80 -60 -70 |
-30 -40 -30 |
15 20 20 |
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