Tait T855 - Page 174

C4.6 T856/857 Functional Testing M850-00
31/09/98 Copyright TEL
Figure 4.3 T856/857 Limiting Response
Wide Bandwidth
Narrow Bandwidth
100 500300 5k50
+10
+8
Modulation Level (dB ref. to max. dev.)
+6
+4
+2
+0
-2
-4
-6
-8
-10
-12
-14
-16
-18
-20
-22
10 20 30 200 1k 2k 3k 10k
Frequency (Hz)
Peak + max. dev. = +4.9kHz @ 1500Hz
Peak - max. dev. = -4.4kHz @ 2500Hz
Above limiting (steady-state)
Mid Bandwidth
The mid bandwidth graph is the same shape as the wide bandwidth graph. The devia-
tion figures are as follows:
peak + max. deviation = +4kHz
peak - max. deviation = -4kHz.
100 500300 5k50
+10
+8
Modulation Level (dB ref. to max. dev.)
+6
+4
+2
+0
-2
-4
-6
-8
-10
-12
-14
-16
-18
-20
-22
10 20 30 200 1k 2k 3k 10k
Frequency (Hz)
Peak + max. dev. = +2.4kHz @ 2000Hz
Peak - max. dev. = -2.5kHz @ 2000Hz
Above limiting (steady-state)