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====== Icom R-72 ======
Manufactured by [[Icom]], Osaka.

In 1986 [[Icom]] released the successor to the [[IC-R70]], The R71 is technologically similar to the [[IC-R70]] but has 32 digital frequency memories.

<fc #ff0000>**Caution**</fc>: the microprocessor code in the RAM of the radios processor is maintained by a backup battery, if this is exhausted or the battery is removed for replacement, the RAM content is lost. In the past the set had to be sent to [[Icom]] for reprogramming, today this can lead to total failure.

==== Variants ====
  * **IC-R71E**: Export version
  * **IC-R71A**: Amateur radio version
  * **IC-R71D**: FTZ-compliant version for Germany (shortwave only up to 26.1 MHz).

{{:images:icom-ic-r71.jpg?direct&400|Icom IC-R71}}
===== Technical data =====
  * [[Principle]]: [[quadruple conversion]], [[IF]] 70.4515 MHz, 9.0115 MHz, 455 kHz, 9.0115 MHz
  * [[Operation modes]]: [[A1]], [[SSB]], [[A3|AM (A3)]], [[F3|FM-n (F3)]] (optional)
  * [[Frequency range]]: 100 kHz - 30 MHz
  * [[Frequency display]]: [[digital display]], 100 Hz, 10 Hz marks
  * [[Frequency memory]]: 32 memories
  * [[Signal strength indicator]]: [[S-meter]]
  * [[signal processing]]: [[RF gain]], [[AGC]] x 2, ([[PBT]], later sets IF shift), RF [[notch filter]]
  * [[Features]]: keypad for direct frequency input, IR remote control 
  * [[Sensitivity]]: [[A3|AM (A3)]] <0.5 μV, [[SSB]] <0.15 μV, [[FM]] < 0.3 μV / [[Selectivity]]: [[AM]] 6 kHz, [[SSB]] 2.3 kHz, [[CW]] 0.5/1.5 kHz (0.25 opt.), [[FM]] 15/25 kHz (-6 dB)

==== Power supply ====
  * [[Mains operation]]: 110, 220 V; 12 V =
  * [[Batteries]]: 4 x 1.5 V ([[UM-2]]), 1 x 1.5 V ([[UM-3]]) for quartz clock

==== Dimensions ====
  * 290 x 120 x 280 mm, weight 7.8 kg

==== Accessories ====
 
===== Operation =====

===== Technical principle =====
After March 1989, due to patent concerns, the [[passband tuning]] was replaced by the technically different [[IF-Shift]].

==== Components ====
The set is semi-conductor equipped.

===== Technical documentation =====

==== Development ====
{{gallery>:images?icom-ic-r71*.jpg&0&80x80&lightbox&showtitle&titlesort}}
==== Further information ====
  * [[https://www.radiomuseum.org/r/icom_ic_r71_e.html|Icom IC-R71 on www.radiomuseum.org]]
  * [[http://n2cbu.n2cbu.com/ N2CBU]] Website mit Hinweisen zur Rekonstruktion des RAM-Inhalts des R-71