====== R-900: HK1 ======
Microwave relay system HK1; manufactured by [[Brown Boveri Cie]].

A first microwave relay system was developed by Brown Boveri around 1949 under the designation **HK1**.

{{ :images:r-900_hk1_front.jpg?400|R-900: HK1}}
===== Technical data =====
  * [[Principle]]: [[transceiver]], microwave relay system
  * [[Operation modes]]: [[F3|FM (F3)]]
  * [[Frequency range]]: ?
  * [[Sensitivity]]: [[A3|AM (A3)]] / [[Selectivity]]: 

==== Power supply ====
  * [[Mains operation]]

==== Dimensions ====
  * mm, kg

==== Accessories ====
  * Dipole antennas with reflectors (similar to those in the [[TLD]]) were used as standard antennas

===== Operation =====

===== Technical principle =====
{{ :images:r-900_hk1_back.jpg?400|R-900: HK1}}

==== Components ====

==== Development ====
The HK1 was the first microwave communications system developed by Brown Boveri around 1949.

==== Use ====
The HK1 microwave relay system was in use from 1951 to 1964; one system is on display in the Dübendorf Air Force Museum.

{{gallery>:images?r-900*.jpg&0&80x80&crop&lightbox&showtitle&titlesort}}

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

==== Further information ====