====== DDS ======
We have two types of DDS (Direct Digital Synthesis) with //USB// port or //Serial// port. 
<note important>Use the right software for programming!</note>

**Default values:** 
  * For generate a **fix** output frequency you can use two reference possibilities: 
      - "Internal Clock Frequency: 400 MHz"
      - "External Clock Frequency: 100 MHz". Input power should be 10 dBm < P < 20 dBm.
    * The output frequency can be only less than the reference frequency!

  * When using **divider** setup with any input and output frequency, the input power should be:
      * f_in < 150 MHz => 10 dBm < P < 20 dBm
      * f_in > 150 MHz => P ~ 0 dBm
      * Devided by 2 isn't possible! (said Andreas from PTB)

===== USB-DDS =====
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  * Software //DDS// for USB Type PTB DDS
  * Datasheet/Manual:
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==== Modifikation to frequency divider ====
  * Datasheet/Manual: {{ :groups:mg:umbau_zum_frequenz-teiler.pdf |Anleitung zum Teilerumbau}}

===== Serial-DDS =====
{{:groups:mg:img_1562.jpg?200|}}
  * Software //Terminal// for Serial Type DDS
  * Datasheet/Manual:
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