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Dan Bobyn
Engineering Ltd.

 

 

 

 

 

 

 

 

 

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VHF SDR Transmit Signal Exciter

This project developed an architecture and implemented associated hardware for a very wide range (two octave) VHF SDR narrowband modulated signal source used in a narrowband data radio.

The exciter accepts digital signal samples and generates an extremely clean, medium level (1 Watt) angle modulated carrier at the required RF frequency. Extremely low off-channel and wideband noise performance is achieved through the use of a phase locked tracking filter and a digitally tuned multi-pole passive LC filter prior to amplifying the signal in a wideband low noise balanced LDMOS amplifier. A DDS provides sub-Hz output carrier frequency resolution.

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2017 Dan Bobyn Engineering Ltd.