Product Manual

Product Manual for Tornado Radio Unit
30
The duplexer electrically connects to the transmitter and receiver via semi-flexible coax. The coax is terminated in
SMB female RF connectors to mate with the opposite gender on the RF and duplexer printed circuit boards. Due
to mechanical constraints the duplexers cannot be interchanged between Channels 1 and 2.
The duplexers would be fitted in the chassis as seen below. The symmetry is more obvious from this view. As
mentioned earlier, in addition to the normal duplexing function the LNA is integrated into the duplexer. The power
supply (+5V) for channel 1 and 2 LNA’s are provided by the red and black twisted cable seen connecting the top
corner of the duplexers to the RF printed circuit board. In this view Channel 1 is seen on the left side of the radio
and Channel 2 on the right. With the radio closed Channel 1 can always be identified as being closest to the green
power connector. In addition, Channel 1 is associated with the horizontal polarisation which is indicated on the
chassis by an ‘H’ next to the RF connector.
Mimomax Tornado Duplexers in Chassis
There are 3 sub-bands of duplexer to cover the entire 400-470MHz switching range. The sub-bands are 400 -
430MHz, 420 - 450MHz and 440 - 470MHz.
The chassis will need to be opened to gain access to the duplexer. The front panel will need to be removed first.
The front panel is fixed to the chassis with two screws. A T8 Torx driver will be required to remove the screws. The
eight screws in the chassis can then be removed using a T20 Torx driver. Water sealing within the chassis will
need to be preserved. There is a main seal (not shown) that fits within the two halves of the chassis and two rubber
O-rings that sit on pillars within the unit as shown above.
7.3.1 TOOLS/EQUIPMENT REQUIRED
• Network analyser or Spectrum analyser with tracking generator or other suitable frequency sweeping set
up covering 400 ~ 470MHz
• +5V Power Supply (if removing duplexer from radio)
• Leads and adaptors to connect measuring equipment to type N female and type N Male and the load to
SMB male
• 50ohm SMB load
• Fine blade tuning tool for Notch Trimmer, recommend Voltronics TT-400
• Long noise pliers for removing the RF semi-flexible coax connectors
• T6 Screwdriver for Tuning Slugs
• T8 Screwdriver for removing Front Panel