Tait T855 - Page 173

M850-00 T856/857 Functional Testing C4.5
Copyright TEL 31/09/98
Figure 4.2 T856/857 Pre-emphasis Response
Wide Bandwidth
Narrow Bandwidth
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 = +0.8kHz
peak - max. deviation = -0.8kHz.
+10
+8
Modulation Level (dB ref. to dev. @ 1kHz)
+6
+4
+2
+0
-2
-4
-6
-8
-10
-12
-14
-16
-18
-20
-22
100 200 300 500 1k 2k 3k 5k 10k
Frequency (Hz)
Peak + max. dev. = +1.0kHz @ 1000Hz
Peak - max. dev. = -1.0kHz @ 1000Hz
+10
+8
Modulation Level (dB ref. to dev. @ 1kHz)
+6
+4
+2
+0
-2
-4
-6
-8
-10
-12
-14
-16
-18
-20
-22
100 200 300 500 1k 2k 3k 5k 10k
Frequency (Hz)
Peak + max. dev. = +0.5kHz @ 1000Hz
Peak - max. dev. = -0.5kHz @ 1000Hz