Antenna Mast Base AB-591/PRC-25

Radio Set, Antenna Base AB-591

Condition: Very good, used

Manufactured by J&H smith, USA

Military Radio Antenna Mast Base AB-591/PRC-25

Antenna base for use with AT-271 Foldable Antenna.

Description: The PRC-25 was designed to use two different antennas.

The AT-892 is a 1 meter long tape measure type antenna that's used with the "Part/Of AT-892" (p/o AT-892) gooseneck base.

This is for shorter range communications. For longer range communications the AT-271 antenna is used with the 8" long AB-591 spring base.

The PRC-25 (and the PRC-77) need to change antenna matching for the short or long antennas and so the threads on the radio are 5/16-24 to prevent the AT-271 from being connected directly to the radio.

This way when the AB-591 which has a "finger" below the 5/16-24 threads is installed a switch is actuated selecting the antenna matching circuitry for the long AT-271.

When the 1 meter tape antenna is installed the switch is not activated and the match is for the short antenna.

• Thread: 3/8-24 socket top, 5/16-24 bottom.
• NSN: 5985-00-086-7149
• Length: 22 cm