In the early days of radio communications, receivers produced by Telefunken, Berlin were mainly procured for the Swiss Armed Forces. With the advent of World War II, more Swiss-made equipment was introduced, such as superhet receivers from Autophon and Zellweger.
Surveillance receivers were acquired in larger numbers, and high-quality communications receivers were purchased in small numbers for interception services and radio surveillance.
In the early days, receivers were designated by an abbreviation Exx, E standing for receiver and the number for the year of introduction.
In 1951, a new nomenclature was introduced in the Swiss Army. Receivers were henceforth given the designation E-6xx, and the devices were numbered consecutively according to chronological order. The receivers still in service received a new designation according to the E-6xx nomenclature in addition to the old one.
|E-600 (E39)||1939/41||Single conversion||100 kHz - 60 MHz||coil sets for frequency ranges|
|E-601 (E41)||1941||Single / double conversion superhet||100 kHz - 60 MHz||Coil sets for frequency ranges|
|E-602 (E44)||1945/51||Single conversion||100 kHz - 37 MHz||drum tuner, separate mains power supply with output stage / loudspeaker|
|E-603 (E45)||1945/51||Single conversion||3 - 15 MHz||turret tuner, separate mains power supply; Air Force alert message receiver|
|E-604 (E46)||1942/5||Single conversion||27 - 101 MHz||VHF surveillance receiver|
|E-606||1965||Single conversion||LW, MW, SW, UKW||Portable radio with HF-TR|
|E-627||1952/56||Single conversion||1,5 - 32 MHz||Military AM receiver|
|E-628||1955/58||Single conversion||20 - 180 MHz||Military VHF receiver|
|E-646||1980||Single conversion||2 - 12 MHz||Receiver for air alert message system|