REPEATER AMPLIFIERS
Your MIRAGE repeater amplifier has several improvements over our standard model
amplifier.
RACK-MOUNT HEATSINK
The large rack-mount heatsink with horizontal fins keeps the transistor temperature low for
longer life in high duty cycle applications. All of the transistors are mounted on 1/4" copper
plates which have been milled into the aluminum heatsink. This provides considerable
faster transmittal of heat from the devices.
AIR-FLOW CHASSIS
The perforated chassis cover allows heat that builds up on the printed circuited board and
components to escape outside the amplifier. This, of course, will increase components and
PC board life in high duty cycle.
DUAL OVER-TEMP PROTECTION
The amplifier has two temperature protection sensors; one on the heatsink and one on the
circuit board. If the amplifier is used under conditions that cause it to overheat, the relay will
drop into the bypassed condition. Your repeater will then operate at the power level normally
going into the amp.
REDUCED RELAY WEAR
Repeater operation greatly increases the number of times the relays must change over. We
have modified the relay drop-out time to hold the relay in for up to 5 seconds when in the
"SSB" position. This allows one station to stop transmitting , allows the repeater to stop
transmitting, and allows the next station to transmit with no relay action in the power
amplifier. This should greatly increase relay life for repeaters that reset when the
transmitter output drops. For repeaters that reset on the input or receive squelch, use the
"FM" position of the switch.
ON-SITE CONTROL
The amplifier has built in switches that control DC voltages to the transmit power amp
and relay delay time circuits. If a more convenient switching panel is desired, the
MIRAGE RC I plugs directly into the repeater amplifier and duplicates the switching
function in a compact box at the end of an 18 foot cable.
