Clickable 145.370 Repeater Image

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Antenna Adapter

The antenna adapter is in the receive line between the Duplexer and the Transceiver to adapt the PL-259 connector to a phono type jack.This particular adapter is simply a surplus, low loss antenna switching relay.

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Power Supply

The power supply is an Astron RS-50A, 13.8 Volts@50 Amps. The repeater draws less than 15 Amps of current while transmitting so the 50 Amp supply provides plenty of current overhead.

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Transceiver

The transceiver is a standard Motorola Micor® which has been modified for repeater use. The repeater modification allows the transceiver to transmit and receive simultaneously. The transceiver does not have a receive pre-amp installed, however, the receiver sensitivity is still less than .25 uV@20dB quieting. The power out of the transceiver has been lowered to between 1 and 2 Watts to drive the external Power Amplifier . A spare transceiver is available to allow quick replacement in the event of a failure.

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Control Head

The control head is basically the volume and squelch controls in a project box. After modifying the Transceiver for repeater operation, most of the functions of a factory control head are not needed, so a simpler version was fabricated to allow adjustment of the volume and squelch externally.

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Controller

The repeater controller is an ACC RC-85 microprocessor controller housed in an aluminum case. The single board provides all of the repeater functions, timers, phone patch, etc. All of the inputs and outputs are connected through a single 25 pin "D" connector to allow easy removal and replacement of the controller with a spare unit.

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Cooling Fans

Mounted above the Power Amplifier are two 3" D.C. cooling fans. The fans are wired in series with a thermostat which turns on at approximately 125 degrees to cool the Power Amplifier . These fans cycle on and off during warm weather and heavy operation. The fans rarely operate during the Winter months.

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Power Amplifier

The power amplifier is a Mirage B-108, 80 Watt amp. The drive from the Transceiver is low enough for the power amp to operate at less than half of it's rated power. This, along with the Cooling Fans allows the amplifier to operate continuously. A spare amplifier is available to allow quick replacement in the event of a failure.

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Surge Protector

The surge protector is no longer installed. It has been replaced with an APC Back-UPS Pro 650, uninterruptable power supply. The UPS offers much better protection than the surge protector.

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A.C. Outlet

Nothing special here, just a typical 110 V.A.C. grounded receptical. It just looked like it needed to be "clickable"!

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Duplexer

The duplexer cannot be seen well in this image since it is covered with a large trash bag to keep out dust and debris. The duplexer is a Wacom WP-641, 4 cavity model. It basically provides isolation between the receiver and the transmitter and combines the two into a single antenna. By the way, the antenna (not shown) is a Celwave PD-340, 4 bay dipole fed with 1/2" Andrew Heliax® feedline.

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Shelf

There's certainly nothing fancy here! The shelf that the equipment is sitting on is constructed from a scrap piece of rough lumber sitting on two concrete blocks.

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