lstoskopf wrote:

>  Why do we need to take the AF signal and run it thru whatever steps to make 
> an RF signal?

If you already have an SSB transmitter (as most people do), that is the most 
convenient way.  Feed in audio and the transmitter translates it to a higher 
frequency.

>    Can anyone explain why the various signals can't be simply generated, 
> especially at the lower bands, and put on the air directly?

It has already been done.  It's not that hard to do.  A local group is working 
on a homebrew transceiver that will be capable of FT8 and other similar modes.  
SSB transmit capability is not a goal so the audio from the computer can't be 
used.  Instead we are generating the RF directly with a DDS chip.  

More details here:  https://github.com/wb2osz/technightradio/tree/master/poc   



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