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en:e-648 [2019/04/09 16:41] (aktuell)
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 +====== E-648: ACL SR-209 ======
 +**E-648**, **Astro Communications Lab. / ACL SR-209**; manufactured by [[ACL|Astro Communications Lab., Gaithersburg,​ Maryland]].
  
 +The modular SR-209 receiver manufactured by the US company Astro Communications Laboratory Inc., Gaithersburg,​ was acquired as VHF monitoring receiver in the 1960s, the Swiss Army designation was E-648.
 +
 +The device was probably used as a predecessor of the VHF / UHF monitoring receiver [[E-649]] by the military radio monitoring service.
 +
 +{{:​images:​e-648-acl-sr-209.jpg?​direct&​600|E-648:​ ACL SR-209}}
 +===== Technical Data =====
 +  * [[Principle]]:​ [[Single conversion]],​ [[IF]]
 +  * [[Modes]]: [[A1]] with BFO, [[A3|AM (A3)]], [[F3|FM (F3)]]
 +  * [[Frequency range]]: 30 - 100 MHz (VHF), 0.5-1 / 1-2 GHz (UHF)
 +  * **Analog dial**
 +  * [[Sensitivity]]:​ / [[Selectivity ]] (-6 dB): 20 / 100 kHz / 3 MHz
 +
 +==== Power Supply ====
 +  * [[Mains]]: 220 V
 +
 +==== Dimensions ====
 +
 +==== Accessories ====
 +
 +----
 +
 +{{:​images:​e-648-acl-sr-209-front.jpg?​direct&​600|E-648:​ ACL SR-209}}
 +===== Operation =====
 +The receiver is installed in a 19 inch cabinet, in contrast to the standard configuration with only one "​tuning head", in the Swiss Army configuration,​ the receiver has double height, so it can accommodate three tuning heads.
 +
 +The entire receiver is constructed in a modular design, to the basic unit, a panoramic display and the tuning heads are added. By selecting different tuning heads and also IF modules with different IF bandwidths from 10 kHz - 8 MHz, the receiver is extremely flexible.
 +
 +The unit is switched on and the corresponding "​Tuning Head" is selected on the main module, the mode switch is located at the top right. The receiver can receive CW (the BFO is automatically turned on in position [[CW]] and if an IF bandwidth below 250 kHz is selected), [[AM]] , [[FM]] and PAM (pulse modulation) signals.\\ ​
 +In addition to the signal strength and FM center meters, the RF gain, audio & video output level controls as well as the headphones jack is located on the center unit.
 +
 +In the ACL Signal Display Unit, a small CRT acts as panoramic display, the signal level and the width of the frequency section can be adjusted. Even short-term transmissions appear as short peaks on the display, the operator can tune the set to the detectable signal peaks.
 +
 +In the receiver variant used by the Swiss Army, the set comes with a basic unit and tuning heads SH-201P which covers the military VHF range, while the tuning heads SH-204P and SH-205P cover the UHF / SHF range from 0.5 to 2 GHz.
 +
 +Available tuning heads from the manufacturer:​
 +  * SH-201P : 30 - 100 MHz
 +  * SH-202P : 90-300 MHz
 +  * SH-203P : 250 - 500 MHz
 +  * SH-204P : 490 - 1000 MHz
 +  * SH-205P : 990-2000 MHz 
 +
 +===== Technical Principle =====
 +The block diagram reveals, that the input signal coming from one of the tuning heads is fed to one of the IF modules A3 (IF bandwidth > 250 kHz), A4 (50 - 250 kHz) or A5 (IF bandwidth below 50 kHz) and then to the demodulator module A6 to the audio frequency amplifier A8; the CDR / squelch amplifier A9 controls the muting function and the video amplifier in module A7 controls the panoramic display.
 +
 +==== Semiconductor setup ====
 +The set is solid state.
 +
 +==== Development ====
 +[[ACL]] has developed the SR-209 in around 1965.
 +
 +==== Field use ====
 +
 +==== Variants ====
 +
 +{{gallery>:​images?​e-648*.jpg&​0&​80x80&​lightbox&​showtitle&​titlesort}}
 +===== Manuals =====
 +
 +==== Additional information ====
 +  * [[http://​armyradio.ch/​radio-d/​e-648.htm|E-648 / SR-209 on www.armyradio.ch]]
 +  * [[https://​www.radiomuseum.org/​r/​astro_sr_209.html|E-648 / SR-209 on www.radiomuseum.org]]
en/e-648.txt · Zuletzt geändert: 2019/04/09 16:41 von mb