Rf And Controls Cables - Mirage B 1018 R Instruction Manual

Power supplies without current limiting must be protected by properly sized fuscs located at thc
supply.
The black lead should connect to the negative terminal through the vehicle chassis. We do not
recommend connecting the black lead directly to a battery post.
The heavy RED conductor and black battery return and/or chassis ground conductors carry full
operating-current. This current can reach 30 amperes. For maximum power output, it is
important to minimize the voltage drop along these conductors. For maximum output powcr, all
high current leads (including the ground lead) should be kept as short as reasonably possible. Be
sure connections are good. Never extract this power from under-dash wiring, unless the vehicle
manufacturer tells you it is safe.
A fuse is must always be installed at the battery to prevent wiring fires. Ifa fuse is not added,
you run the risk of a fire if the wiring is accidentally shorted between the battery and amplifier.
NEVER omit this fuse, no matter how safe you think it is!
Suitable fuses and holders are generally available from electronics, car stereo, and automotive
parts stores. This device requires a 30-ampere fuse.
The following chart gives the approximate peak voltage drop in volts per foot of a single supply
wire with 30 amperes of current. This chart assumes the negative return to the battery (through
the vehicle chassis) has the same resistance as the positive lead, or that a home power supply uses
equal length and size conductors for positive and negative (ground) leads.
AWG Voltage Drop Maximum Length For Full
(single conductor)
at 30 amps
Performance
10 gauge 0.03 vif
0.02. Vin
0.011 Vit
0.007 Wit
For best performance, voltage drop in high-current positive and ground leads should be limited to
0.5 volts or less at maximum current of 30 amperes.
1.3 RF AND CONTROL CABLES
Length of RF and control cables is ot critical.
The RADIO connector of this amplifier is a SO-239 (UHF Female). UHF-style connectors are
perfectly fine at frequencies below UHF, and have almost immeasurable loss at VHF and lower.
The amplifier input is matched for 50-ohms, and the amplifier is very stable. The input cable can
be any reasonable length, as far as the amplifier is concerned.
The ANTENNA connector is a SO-239 (UHF Female). The design load impedance is 50-ohms,
and any load with a VSWR under 2:1. The output cable must safely handle the full power of the
amplifier, and must have good connections.