1 Supervisory and 4 Coherent Channels

1 Clock Card (CLK_Card) is used for the realisation of the entry level receiver. Such architecture enables the configuration of up to 5 receiving channels. 4 channels are synchronised by the Buffer Clock 5PB1104 and 1 channel is synchronised directly by the TCXO 28.8 MHz (see the block-diagram for more details).
The 28.8 MHz output can be used for the connection of one or more single-channel receivers (using HF-adapter) or EXP_Card for the middle level configurations.

  • ADC Resolution: 8 bit
  • Clock: 28.8 MHz
  • Temperature compensated oscillator (TCXO) : 2 PPM (2 PPM initial offset, 0.5-1 PPM temperature drift). Higher precision, e.g. 0.1, 0.5, 1.0 ppm, available  on request.
  • Female antenna port : SMA
  • R820T2 tuner: 24 MHz –  1766 MHz (direct sampling with lower frequencies possible)
  • Operation temperature: -10 to 60 ˚C
  • USB powered bias tee: 4,5V
  • Noise figure: 3.5 dB @ RF_IN
  • Noise floor: –60 dBm
  • Dimensions (RTL-SDR, CLK_CARD, EXP_CARD): 67 x 25 x 6 mm

Direction finding system (configuration: 4+1)

The Supervisor has following functions:

  • power supply to the clock card
  • I2C interface to the clock card and noise generator
  • The Supervisor can be used as a normal receiver as well

The Supervisor can be tested by starting a SDR-programm, like rtl_fm or SDR#. Tune this receiver to the FM-Station and you have to get FM-signal without any additional steps or configurations. Single channel receivers have a common clock that is distributed from the clock card; you need to power on the supervisor in order to provide the power supply to the clock card. If the clock card is off, it cannot generate clock. Therefore, the system will not work.