(c) 2001,2022 Peter McCollum
The RS-511 Attache-Case Radio
This radio set is shown in Keith Melton's books (see Bibliography) as the 'attache case radio'. It is essentially the main components of an RS-6 set, repackaged in a metal Halliburton case. There is a single metal panel, with the chassis of the RR-6 and RT-6 mounted on the underside. The power supply components are different from the RP-6 and RA-6.
Unlike the RS-6, the RS-511 directly supports high-speed burst keying at 300 WPM (the RS-6 supports an 'automated keyer', but only at speeds up to 60 WPM). The upper left corner of the panel includes 3 compartments for storing the KE-8, CO-8, and CA-3 components (part of the CK-8 coder/keyer system).
Other changes or improvements of the RS-511 over the RS-6 include:
· Because of the RS-511's packaging as a single unit, many possible problems with the RS-6 set are avoided. With the RS-6, there are several cables that must be connected correctly according to the type of power source, etc.
· A meter indicates the proper line voltage setting, instead of the simple neon lamp used in the RS-6.
· The receiver operates VFO only - no crystal control, apparently.
· A full-sized straight key is mounted on the panel. There is no apparent connection for a separate key, other than the KE-8 keyer.
· The power supply appears to use solid-state rectifiers and electrolytic capacitors, instead of the 6X4 tube and oil capacitors of the RS-6.
· The tuning knobs on the RR and RT have been modified so that they can be accessed through the main panel.
Two variations of this set have been seen: one based on the RR-6 and RT-6 (see images below), and another using RR-6A and RT-6A components (see Keith Melton's book, "The Ultimate Spy Book"). The one using "A" model components has the appropriate markings differences on the front panel, since the RS-6A has a somewhat different frequency range. It is not known for certain what the nomenclature is for the "A" version, since the model and serial numbers have been scratched off of that example - it could possibly be RS-511A.
RS-511 set, serial # 153. This unit was found in Greece. It may have been part of a "leave-behind" program, but appears to have never been used. Image courtesy of Kostas M.
The coder/keyer components and antenna and ground wires shipped with the RS-511. Although not clearly visible in this image, the letters on the coder wheel are Greek letters. Image courtesy of Kostas M.
The RS-511 with all of its known accessories, including a dual hearing-aid type earphone, and three CA-3 message tapes. Image courtesy of Kostas M.
An underside view of the RS-511 chassis. The main components are, clockwise from upper left: RR-6 receiver serial # 6290, RT-6 chassis with some modifications, power supply rectifier and filter, power transformer, cabling compartment, and coder/keyer storage compartment. Image courtesy of Kostas M.