User's Manual

VHF UNIDIRECTIONAL AMPLIFIER TECHNICAL MANUAL
5
DC power needs of the VGA and PA. The unit can also be fed directly with the DC power, by
selecting the AC/DC switch to DC position and connecting +48 Volts (1A) and +6 Volts (2A)
to the DC input connector. The operator must ensure that his external DC power supplies are
compliant with FCC Class A limits on the radiated and conducted emission.
- The unit does not have built-in UPS/Battery system. In case of need for inconsistency in the AC
line power, surge protection, short Black outs, crossover time from line AC to generator power,
circuit breaker for short circuit and over load protection, etc., an external UPS/Battery system is
recommended.
VGA IN
VGA OUT
PA IN
PA
OUT
MidAMP
BPF
AGC
Input
BPF
Output BPF
(optional)
ISOLATOR
Figure 1: Bloc diagram of the VHF Amplifier with external filters
Note: the use of an isolator at the PA output is mandatory.