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====== Siemens RK 661 ======
Manufactured by [[Sangean]], Taiwan.

The world band receiver [[ATS-808]], a microprocessor controlled travel radio with digital PLL frequency synthesis, was introduced around 1990 and was also sold as Siemens **RK 661** or under the Uher brand.

{{:images:siemens-rk661.jpg?direct&600|Siemens RK 661}}
===== Technical data =====
  * [[Principle]]: [[Double conversion superhet]], [[IF]] 450 kHz / FM 10.7 MHz
  * [[Operation modes]]: [[A3|AM (A3)]], [[F3|FM (F3)]]
  * [[Frequency range]]: FM, LW, MW, SW (1.7 - 30 MHz)
  * [[Frequency display]]: [[digital display]], 1 kHz
  * [[Frequency memories]]: 18 memories
  * [[Signal strength indicator]]: LCD bar
  * [[Signal processing]] 
  * [[Features]]: clock, timer
  * [[Sensitivity]]: [[A3|AM (A3)]] / [[Selectivity]]: kHz (-6/-60 dB)

==== Power supply ====
  * [[Batteries]]: 4 x 1.5 V ([[UM-3]]), 2 x 1.5 V ([[UM-3]]) for quartz clock / memories

==== Dimensions ====
  * 196 x 125 x 36 mm, weight 0.6 kg

==== Accessories ====

===== Operation =====
The Siemens RK 661, or the Sangean equivalent [[ATS-808]], is a compact pocketbook-sized double conversion radio which uses PLL frequency synthesis circuitry to cover the entire AM range from 150 - 29,999 kHz and the VHF range from 87.5 - 108 MHz.

The frequency can be entered directly with the numeric keypad, alternatively you can use the UP/DOWN keys or the tuning knob with two tuning speeds.

The set does not have a [[BFO]] for receiving single sideband transmissions.

The two settings of the digital clock can be set to local and world time.

===== Technical principle =====
Double conversion, digital frequency synthesis using PLL circuit.

==== Components ====
The set is equipped with semiconductors.

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

==== Development ====
{{gallery>:images?siemens-rk661*.jpg&0&80x80&lightbox&showtitle&titlesort}}
==== Further information ====
  * [[https://www.radiomuseum.org/r/siemens_rk661rk_66.html|Siemens RK 661 on the website of www.radiomuseum.org]]