#NAVY VLF RECEIVER SERIES#

A phone jack had also been installed on the rear panel. That was removed and replaced by a directly connected 3-wire shielded power cord with the safety ground attached to the chassis. A female Jones connector for AC power had been installed on the rear panel of the ARB requiring a dangerous power cord with two male connectors. This ARB unit did not work at all when purchased. The remote Audio gain, RF gain, IF bandwidth control, CW oscillator switch, and the power switch were all mounted on the front of the radio after removing the electrical connectors that had been used for connecting the controls to the remote panel.

#NAVY VLF RECEIVER SERIES#

Voltage for the IF bandwidth change relay, originally supplied by 28 volts, was wired in series with the B+ line. This ARB has a near-equivalent 12SQ7 for that purpose using an octal socket opening originally used for a capacitor in the ARB. Since the radio was originally designed only for headphone volume, the article suggests adding a 6AT6 miniature tube to increase the audio level for speaker output and to replace the audio output transformer. Filament power for the 12 volt ARB tubes is supplied by the transformer's 6 volt and 5 volt windings connected in series. The dynamotor was replaced by a power transformer with a 6X5 rectifier. This ARB mostly follows that article's recommendations. An article in the June 1958 issue of CQ magazine, page 68, details suggested modifications for ham use. Like most surplus-market ARB receivers still in existence, this ARB was heavily modified for amateur radio use. Like much military hardware from WWII, the ARB was sold on the surplus market. 'The ARB receiver showing components for a complete one place installation' A dynamotor inside the ARB provided B+ voltage.ДЄRB and controls as pictured in a 1942 Navy Radio and Sound Bulletin The power for the set was supplied by the 28 volts aboard the aircraft. The 4 bands were changed from the remote location by a small electric motor in the set.

The tuning control is labeled with the frequency coverage for all four bands of the ARB.ДЄll of the other controls for the receiver were also located on a remote panel. The pilot or navigator could control the tuning by using a remote control often called a 'coffee grinder' because of the action necessary to turn the control. The 915 KHz IF can also be switched by a relay for either narrow or broad bandwidth.ДЄRB receivers were all designed to be controlled remotely from the cockpit of Navy aircraft. The IFs are automatically selected by the bandswitch. The ARB uses two different IF frequencies, 135 KHz for the VLF and Broadcast bands and 915 KHz for the two shortwave bands. Frequency coverage is continuous from 195 KHz to 9.05 MHz in 4 bands. The Navy identifies the receiver as part number CRV-46151. The ARB is a World War II US Navy aircraft radio receiver system.

Navy vlf receiver