Discontinued Ameritron ARB-704 - Amplifier to radio interface for most rigs

ARB-704 will work with almost any transceiver without the need of the plug-and-play pre-wired cable.

Protects expensive radio from damage by keying line transients and steady state current and voltages.

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 open circuit voltage and 300 mA of operating 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 ststems. It is especially suited 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 ground, or output a wide range of positive or negative control voltages. The transmitter only switches currents under 0.35 milliamperes and very low voltages when using the ARB-704. Measures a super compact w-4 1/4 x H-1 3/4 x D-2 3/4 inches.

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.

Model Transceivers

• PNP-8D FT-1000/2000, (MP), 767GX, 920, 990, 747GX
• PNP-8M FT-890, 840, 817, 857, 897, FT450, 950, 900
• PNP-35  FT-100, (D)
• PNP-5M  FT-847
• PNP-7D  TS-440, 690, 450, 180, 140, 950, 130, 870, 2000, 50, 120, 530, 430, 830, 850, 940, 570
• PNP-13D  All models of the IC-706 series, 718, 7000
• PNP-7DK  TS-930 (serial numbers lower than 309)
• PNP-8MK   TS-480
• PNP-5D  FT-980
• PNP-8D  Icom ACC Jack
• PNP-7DI Icom ACC 2 Jack