[aprssig] Phase modulation question

[Andrew Rich]

I have a question 

You get a carrier on 430 MHz and modulate it with a an audio signal that changes phase eg PSK

You get a DSP to create a low level phase shifted carrier and then up convert to 430 MHz and send that to air

Are they different ?




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Andrew Rich 
Airways Technical Officer Grade 4
Surveillance - RADAR ADS-B
Amateur Radio Callsign VK4TEC
email: vk4tec at tech-software.net
web: www.tech-software.net
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