shortwaveradio.ch

Diese Seite ist nicht editierbar. Sie können den Quelltext sehen, jedoch nicht verändern. Kontaktieren Sie den Administrator, wenn Sie glauben, dass hier ein Fehler vorliegt.
====== Collins R-390/URR ======
Manufactured by [[Collins|Collins Radio Comp., Cedar Rapids]].

The **R-390** is a military communications receiver that was introduced as a succossor to the Collins [[51J-4|R-388]] It was introduced in the mid-fifties; unlike the [[R-390A]], the set is equipped with LC / coil filters and not the legendary mechanical filters.

{{:images:collins-r390a-front.jpg?direct&600|Collins R-390A/URR}}
===== Technical data =====
* [[Principle]]: [[triple conversion superhet]], [[IF]] 17.5 - 25 MHz / 3 - 2 MHz, 455 kHz / FM 10.7 MHz
* [[Operation modes]]: [[A1]] with BFO, [[A3|AM (A3)]]
* [[Frequency range]]: 0.5 - 32 MHz
* [[Frequency display]]: mechanical - digital display, 100 Hz
* [[Frequency memory]]: none
* [[Signal strength indicator]]: [[S-meter]]
* [[Signal processing]]: [[RF gain]], [[AGC]] 3x, [[noise limiter]], SSB add-on optional
* [[Features]]: 
* [[Sensitivity]]: [[A3|AM (A3)]] <1 μV / [[Selectivity]]: 100 Hz, 1 / 2 / 4 / 8 / 16 kHz (-6/-60 dB)

===== Technical principle =====

==== Valve complement ====
V201 ([[de:6AJ5]], 1st RF amplifier); V202 ([[de:6BJ6]], 2nd RF amplifier); V203 ([[de:6C4]], 1st mixer); V204 ([[de:6C4]], 2nd mixer); V205 ([[de:6C4]], 3rd mixer);\\ 
V401 ([[de:6AJ5]], 1. 1st crystal oscillator); V402 ([[de:6AJ5]], 2nd crystal oscillator);\\
V501 ([[de:6BJ6]], 1. IF amplifier); V502 ([[de:6BJ6]], 2. IF amplifier); V503 ([[de:6BJ6]], 3. IF amplifier); V504 ([[de:6BJ6]], 4. IF amplifier); V505 ([[de:6BJ6]], 5. IF amplifier); V506 ([[de:6AK6]], 6. IF amplifier); V507 ([[de:12AU7]], detector); V508 ([[de:5749]], BFO); V509 ([[de:6BJ6]], AGC amplifier); V510 ([[de:6BJ6]], limiter); V511 ([[de:12AU7]], AGC time constant); RT512 ([[de:3TF7]], voltage regulator);\\
V601 ([[de:12AU7]], LF preamplifier, squelch); V602 ([[de:12AT7]], AF preamplifier); V603 ([[de:6AK6]], AF output stage); V604 ([[de:6AK6]], AF amplifier line out); V605 ([[de:6082]], voltage regulator); V606 ([[de:6082]], voltage regulator); V607 ([[de:6BH6]], D-C amplifier); V608 ([[de:5651]], voltage reference); V609 ([[de:5651]], voltage reference);\\ 
V701 ([[de:5749]], VFO);\\ 
V801 ([[de:26Z5]], rectifier); V802 ([[de:26Z5]], rectifier);\\\ 
V901 ([[de:12AU7]], crystal calibrator); V902 ([[de:12AU7]], multivibrator).

===== Technical documentation =====
  * {{ :manuals:tm-11-856-r_390.pdf |TM-11-856: Radio Receiver R-390/URR}}

==== Further information ====
  * [[https://www.radiomuseum.org/r/collins_r_390urr.html|Collins R-390/URR on the website of www.radiomuseum.org]]