Original Item: Only One Available. During the 1950s and 1960s, the United States military used a compact mobile shortwave receiver called the AN/GRR-5, which was affectionately known as the "Angry 5." The GRR-5 was initially designed as a gas warning receiver to be mounted in vehicles and sound an alarm in case of a gas attack. Later, it was expanded to include nuclear and biological attack warnings as well. It's important to note that the AN/GRR-5 was not a communications receiver. However, since it was considered a solution to a nonexistent problem, most of these receivers were never deployed and were eventually sold off as surplus between 1978 and 1985.

The radio set is composed of two chassis, namely the R-174/URR receiver and the PP-308/URR power supply. The cabinet, which has the model number CY-615/URR, consists of two compartments that house the components. The set is complete, and both the receiver and the power supply are present. Although the unit looks attractive, we cannot guarantee its functionality since we have no means of testing it. This item is being sold as a novelty display item only. It measures 15" H x 14 1/2"W x11" D, and weighs approximately 50lbs.

The paint has been retained well but there is the expected wear present with paint loss. The cases do have dings and scratches in them, but do not be alarmed as it just adds to the rugged look of the unit as a whole. The unit weighs in at a hefty 50 pounds, so do use caution while setting it up for display.

This multi-band radio provides coverage for a frequency range of 1.5 Mhz to 18 Mhz, over four bands. It is important to note that the standard broadcast band is not covered by this radio. The tuning knob is located on the right side, and above it, there is a small tuning dial for precise tuning.

On the left side of the radio, there are large connectors for the antenna and ground, the RF gain knob, and a four-position bandswitch, which allows for quick and easy switching between the radio's four bands. The antenna trimmer knob is located below and to the left of the tuning knobs for further tuning options.

At the top right corner of the radio, there is a Monitoring Input connector with a removable cap. To its left, there is a four-position mode switch for PHN, CW, NET, and CAL, which allows for the selection of different operating modes. Just below the mode switch, there are two Phones connectors, also with removable caps, for connecting headphones.

At the lower right side of the radio, there are two knobs, the BFO and AF Gain, which control the audio and signal processing. Between the two knobs, there is a two-position output switch for LO/HI, allowing for the selection of different output levels.

In the center of the lower power chassis, there is a rugged speaker grille, providing clear and powerful audio output. To its left, there are two jacks with removable caps. The upper jack is for connecting a dry battery cable, while the lower jack is a container for spare fuses. The fuse caps themselves are located in a row along the bottom for easy access.

At the upper right corner of the radio, there is a Power Input jack for connecting an AC or non-battery DC power source. To its left, there is a speaker on/off switch, providing control over the audio output. Below the speaker switch, there is the main power switch, which turns the radio on and off. On the left of the main power switch, there is a four-position Power Selector, with positions for 6V, 12V, 24V, and Dry Battery. A legend on the front panel notes that changeover to AC power is automatic, providing flexibility and ease of use.

This is truly a wonderful piece of equipment, packed with great research potential. Comes more than ready for further research and display.