Transceivers

Radio equipment used

In our ground station, we make use of a variety of radio equipment for different frequency ranges.

The Keenwood TM-241 transceiver is used for the VHF band, while a Kennwood TM-441 is used in UHF frequencies.

Another versatile device is the SDR receiver, dedicated to FunCube Dongle satellites. 

 

 Keenwood TM-241

 

Technical details:

 

GENERAL
Antenna Impedance 50 ohms
Current Drain Receive Less than 600 mA
Current Drain Transmit Less than 11 A
Dimensions (W x H x D) 5.51 x 6.3 x 1.57 in. (140 x 40 x 160 mm)
Frequency Range TX: 144 – 148 MHz
RX: 118 – 174 MHz
Ground Negative
Microphone Impedance 500-600 ohms
Mode F3E (FM), A3E (AM) (RX only: 118 – 174 MHz)
Operating Temperature Range -20°C – 60°C
Power Requirement 13.8V DC (±15%)
Weight (approx.) 2.4 lbs. (1.1 kg)
RECEIVER
Audio Output Power More than 2W (8 ohms, 5% distortion)
Circuitry Double conversion superheterodyne
Intermediate Frequency 1st IF 10.7 MHz
Intermediate Frequency 2nd IF 455 kHz
Selectivity -6 dB More than 12 kHz
Selectivity -60 dB Less than 24 kHz
Sensitivity (12dB SINAD) Less than 0.16µV
Squelch Sensitivity Less than 0.10µV
TRANSMITTER
Frequency Tolerance Within ±10 ppm
Maximum Frequency Deviation ±5 kHz
Modulation Reactance modulation
Modulation Distortion Less than 3%
RF Output Power HI 50 W
RF Output Power LO 5 W
RF Output Power MID 10 W
Spurious Radiation Less than -60 dB

 

Kennwood TM-441

Technical specifications are similar to the previous model, except for the frequency range, which is, in this case, 430-440 MHz.

 

FunCube Dongle pro+

This device is a SDR (software defined radio) radio receiver, designed especially for the reception of satellites. 

 

Specifications

  • Guaranteed frequency range: 150kHz to 240MHz and 420MHz to 1.9GHz
  • Typical frequency coverage: 150kHz to 260MHz and 410MHz to 2.05GHz
  • TCXO specified at 0.5ppm (in practice about 1.5ppm)
  • 192kHz sampling rate
  • Extremely simple hardware setup, just two connections, an “in” and an “out”:
    • Standard SMA female antenna port
    • USB 1.x type A male connection
  • Eleven discrete hardware front end filters including:
    • 6MHz 3dB bandwidth (10MHz at -40dB) SAW filter for the 2m band.
    • 20MHz 3dB bandwidth (42MHz at -40dB) SAW filter for the 70cm band
    • Third- and fifth-order LC bandpass filters for other bands
  • Front end LNA OIP3 30dB
  • Typical noise figures:
    • 50MHz 2.5dB
    • 145MHz 3.5dB
    • 435MHz 3.5dB
    • 1296MHz 5.5dB
  • Typical NFM 12dB SINAD measurements:
    • 145MHz 0.15uV
    • 435MHz 0.15uV
  • No additional drivers required for Linux, OSX or Windows
  • Integrated 5V bias T switchable from software 

All the information about this receiver may be found in the web page www.funcubedongle.com. More precisely, HERE you can find documentation, software, source code, etc.

 

 

 

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