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en:e-604 [2019/03/22 22:15] (aktuell) – angelegt - Externe Bearbeitung 127.0.0.1
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 +====== VHF Receiver E-604 (E46)======
 +**VHF Empfänger 46**, **E46**; developed and produced by [[Autophon|Autophon AG, Solothurn]].
  
 +In parallel to their E52 / E44 receivers, [[Autophon]] developed a VHF - receiver; because of the use of the [[VHF]] range for military tactical communications was still quite far in the future, only a small test series of this receiver has been made on behalf of the Airforce / Anti-Aircraft troops.
 +
 +{{:images:e-604-autophon-e46.jpg?direct&600|}}
 +
 +===== Technical Data =====
 +  * [[Principle]]: [[Single conversion]], [[IF]] 4,3 MHz
 +  * [[Modes]]: [[A3|AM (A3)]], [[F3|FM (F3)]]
 +  * [[Frequency range]]: 27 - 101 MHz in eight frequency ranges, **turret tuner** for band selection
 +  * **Analog dial**, nonlinear
 +  * [[Sensitivity]]: [[A3|AM (A3)]] 1.5 - 3.5 μV / [[Selectivity ]]: ± 20 kHz / ± 40 kHz / ± 75 kHz
 +
 +==== Power Supply ====
 +  * [[Mains]]: 110, 125, 145, 160, **220**, 250 V
 +
 +==== Dimensions ====
 +  * Receiver case **E46**: 400 x 320 x 280 mm
 +
 +==== Accessories ====
 +  * Headphones
 +
 +----
 +
 +{{:images:e-604-autophon-e46-front.jpg?direct&600|E45 front view}}
 +===== Operation =====
 +The front panel is divided in two sections by the horizontal linear dial of the turret tuning arrangement.
 +Above the dial, You find from the left hand the coaxial antenna connector and the sockets for connecting longwire antenna and earth, then the station clock, and the signal strength meter. This can be switched to indicate the heaters and plate / B+ voltages. At the right upper corner, You find the mains socket, the mains voltage selector and mains switch and some fuses.
 +
 +Underneath the frequency dial, You find the rotary band switch operating the turret tuner - find the corresponding dial in the dial window - and at the right hand the main tuning knob with a mechanical blocking arrangement. Next to this one the switch for the two different IF bandwidths of +/- 20 and +/- 75 kHz.
 +
 +In a row of controls below, you find from the left the volume control ("Lautstärke" or "Puissance"), the noise limiter switch, speaker and headphone jacks, the AGC/RF gain control, the BFO control for CW reception, the tone and the AM/FM reception mode switch.
 +
 +===== Technical Principle =====
 +A neon buld is used to protect the receiver frontend from overloading. The RF signal has to pass two RF amplifier stages ([[de:EF50]], each). It is then mixed with the signal from the main oscillator ([[de:EF50]], Pos. 322) and converted to the [[intermediate frequency]] of 4.3 MHz in the mixer stage ([[de:ECH21]], heptode system). The [[IF]] then is amplified in two IF amplifier stages (two [[de:EF50]]).\\ 
 +The signal is then feed into the [[de:ECH21]]; in [[A3|AM (A3)]]-Mode, one grid of the [[de:ECH21]] serves as rectifier for demodulation, in [[FM|FM (F3)]]-mode, the [[de:ECH21]] is used as limiter stage, the double diode [[de: 6H6]] as diskriminator to demodulate FM transmissions.\\ 
 +The valve [[de:ECH21]] is used as AF preamplifier stage, the [[de:EBL21]] as AF final stage. The signal then will reach the hedphones and speaker jacks, two antiparallel selenium rectifier diodes serve as noise limiter.\\ 
 +{{:images:e-604-autophon-e46-block.jpg?direct&400|}}
 +
 +==== Valve setup ====
 +V1, Pos. 474 ([[de:EF50]], RF amplifier); V2, Pos. 424 ([[de:EF50]], RF amplifier); V3, Pos. 374 ([[de:ECH21]], mixer); V4, Pos. 322 ([[de:EF50]], oscillator); V5, Pos. 205 ([[de:EF50]], 1. IF amplifier); V6 , Pos. 176 ([[de:EF50]], 2. IF amplifier); V7, Pos. 148 ([[de:ECH21]], AM demodulator, FM limiter); V8, Pos. 130 ([[de:6H6]], double diose as discriminator); V9, Pos. 54 ([[de:ECH21]], AF preamplifier); V10, Pos. 40 ([[de:EBL21]], AF final amplifier).\\
 +Gl1, Pos. 8 ([[de:AZ1]], rectfier plate voltage), Gl2, Pos. 7 ([[de:AZ1]], rectifier for all other voltages), Selenium rectifier Pos. 13 for grid voltage.
 +
 +==== Development ====
 +
 +==== Field use ====
 +In 1947, only a small preliminary series of eleven receivers of this set has been produced, only four of them remained with the Signals Comp. 20
 +
 +{{gallery>:images?e-604*.jpg&0&80x80&lightbox&showtitle&titlesort}}
 +
 +==== Manuals ====
 +  * {{ :manuals:e-604-autophon-e46-revisionsanleitung-small.pdf |Technical Manual AM-FM Receiver E46}}
 +  * {{ :manuals:e-604-autophon-e46-schema.pdf |Schematics AM-FM Receiver E46}}
 +
 +==== Additional information ====
 +  * [[http://armyradio.ch/radio-d/e-604.htm|E-604 / E46 on www.armyradio.ch]]
 +  * [[http://www.radiomuseum.org/r/autophon_e46e_4.html|E-604 / E46 on the Website of www.radiomuseum.org]]
en/e-604.txt · Zuletzt geändert: 2019/03/22 22:15 von 127.0.0.1