MFJ ARB704 - Ameritron Amplifier to Transceiver Interface, for all XCVR

The ARB-704 will work with almost any transceiver without the need for a plug-and-play pre-wired cable. It's 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.

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.

The ARB-704 has many electrical advantages over conventional relay buffer systems. it 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. It is fully compatible with conventional amplifier relay systems. It is especially suited for buffering vacuum relay QSK amplifiers, since the it does not affect attack or release times in a deleterious manner.

The transmitter only switches currents under .35 milliamperes and very low voltages when using the ARB-704. Measures 4 ¼" x 1 ¾" x 2 ¼".

The ARB-704 is supplied with the following

• One power connector cord and plug with red wire (+12 Volts) and black wire (negative and ground)
• Three phono (RCA) cord with connectors on each end. These cables are for relay, ALC and amplifier control lines