| The ARB-704 will replace the current series of amplifier
interface buffers(702I, 702I2, 702K, 702Y). The ARB-704 will work with
almost any transceiver without the need of the plug-and-play cable.
The ARB-704 advanced interface is compatible with all common radios
and amplifiers even though radios and amplifiers do not have
standardized voltages, accessory plugs, or wiring. This interface is
designed to work with any amplifier/radio combination.
The input is designed to be compatible with any transmitter or
transceiver, and the output is compatible with AC control lines or DC
positive or negative amplifier control lines having up to 200 Volts peak
oepn circuit voltage and 300 mA of poperating current.
Why you need the ARB-704
Amplifiers can damage radios if the amplifier has too much relay
control voltage, voltage spikes, or excessive current on the relay
control line. Such damage often appears as "stuck" or
"sticky" transmit relays in exciters or shorted transistors on
transmit control lines. In most cases where the radio is damaged, the
system transmits normally but the external amplifier stays locked in a
"transmit" mode. This prevents receive signals from coming
through the amplifier with normal levels whenever the amplifier is in
the "ON" or "OPERATE" position.
The ARB-704 has many electrical advantages over conventional relay
buffer systems. The ARB-704 has no moving parts, switches almost
instantaneously. It is noiseless, has very long life, and will not
develop dirty contacts. It operates with negative, AC, or positive
amplifier relay control lines.
It works with any relay voltage(AC, positive,or negative) up to 200
peak volts and any relay current up to 300 mA. The ARB-704 is fully
compatible with conventional amplifier relay systems. It is especially
stuied for buffering vacuum relay QSK amplifiers, since the ARB-704 does
not affect attack or release times in a deleterious manner.
The ARB-704 operates with transmitters or transceivers that pull
amplifier control lines to gruond, or output a wide range of positive or
negative control voltages. The transmitter only switches currents under
.35 milliamperes and very low voltages when using the ARB-704. Measures
a super compact 4-1/4W x 1-3/4H x 2-1/4D inches
The ARB-704 is supplied with the following:
1. One power connector cord and plug with red wire (+12 Volts) and black
wire (- and ground).
2. Threee phono (RCA) cord with connectors on each end. These cables are
for relay, ALC and amplifier control lines.
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