Topband: Digital mode spurious issues

[Guy Olinger K2AV]

On Tue, Dec 31, 2013 at 2:21 PM, Tom W8JI <w8ji at w8ji.com> wrote:

> . It would be much better to actually shift a carrier, and not do the
> baseband audio signal run though a balanced modulator and then through a
> sideband filter.


Better yet to generate the best transition waveform in data (far more
difficult to do in analog methods) and via a DAC create a completely clean
signal at the TX IF level.  Then only conversion and RF issues to keep
clean. Then adjustments to waveform are in firmware.

73, Guy.