INSTALLATION
The RFC 4-LLg can be mounted with ttre 'Lrr brackets, supplied.
It should be placed to provide maximum ventilation around the heat
sink. Heavy gauge wire should be used to connect the RFC A'LLA to
the battery or power suppty. For medium distances use #IO wire and
for longer distances use #B wire. To connect the amplifier to the
antenna, RG-8A/U or equivelent coax is recontmended.
For best performance, the antenna should be adjusted for an
SWR of less than 1.5:1.
OPERATION
The power amplifier is connected between the radio and the
antenna, The RFC 4-110 will boost the power of a l0 watt radio to
LQA Ylai--ts or more. The GaAs-Fet receiver Preamp wiII improve coPy
on weak or marginal signals. When either the power amplifier or
the preamp are "on" they automatically switch in and out of the
circuit, by sensing the RF from the radio. The rrTxrr LED will
light during transmit.
The automatic switching is ok for FM, but on SSB the relays
may drop out during pauses. Therefore, it is high1y recommended
that the external keying feature be used with SSB. Please see the
"EXTERNAL KEYING" section.
FAULT CONDITIONS
During normal operation the 'TXrr LED will light when the
power amplifier is activated.
The RFC 4-110 has a special circuit that senses return power
(SWR) from the antenna. If this returned power exceeds
approximately 25 Watts, the amptifier automatically shuts off,
lighting the "SWR" LED and turning off the r'Txrr LED. In order to
reset the amplifier, the power on-off switch must be switched off
for 2 seconds then turned back on. WARNINGI CHECK OUT THE
ANTENNA SYSTEM BEFORE OPERATING THE AIVIPLIFIER AGAIN.
If the heat sink temperature exceeds 175 degrees F. the
internal thermostat. will open, shuting down the power anplifier.
The rrTxrr LED will go out. The thermostat will automatically reset
when the heatsink cools down.
FUNCTIONS
The functions of the RFC 4-11O are controlled by the three front
panel switches.
POWER ......... This switch activates the power amplifier section,
as well as reseting the SWR protection circuit.
FM-SSB ........ In FM, the amplifier has a fast dropout when the
carrier is removed. In SSB, this dropout is
