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WBFM - Wide Band FM packet radio RTX

70cm WBFM

Block diagram
RF front-end
RF front-end PCB
RF front-end component location
IF module
IF module PCB
IF module component location
70cm WBFM module location
Corrections to RF front-end
Corrections to IF module
Usable combinations of filters and quartz crystals
PLL measurement
Modulation test
AF test amplifier

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23cm WBFM

Block diagram
Receiver, RF module
Receiver, IF module
Receiver, RF module PCB
Receiver, IF module PCB
RF RX module component location
IF RX module component location
TX driver schematic
TX front end schematic
TX driver PCB
TX front end PCB
TX driver component location
TX front end component location
RX/TX switch
RX/TX switch PCB
RX/TX switch power supply PCB
RX/TX switch component location
RX/TX switch power supply component location
23cm WBFM module location
Soldering of RF coax
Mounting of RF front end transistor
Yagi antenna for 23cm (17 element)


Original 70cm and 23cm WBFM's were developed by S53MV but S51RM and S53RM made redesign of them.