This circuit consists of an amplifier for the synch channel and a video detector which controls an attenuator so that the gain of the systems is increased during synch intervals. For the outband decoder to work, the cable company must provide at least a 1 millivolt signal. Values for C1-C5 and L1-L4 are found in Table 1.
Table 1
Table 1
50Mhz | 90-114Mhz | |
C1 | 5pf | 5pf |
C2 | 47pf | 12pf |
C3 | 200pf | 82pf |
C4 | 56pf | 12pf |
C5 | 56pf | 10pf |
L1 | 0.2mH | 0.2mH |
L2 | 0.05mH | 0.03mH |
L3 | 0.175mH | 0.2mH |
L4 | 0.175mH | 0.24mH |
0 comments:
Publicar un comentario