I was one that dismissed and still do the uSDX not that it could not work but it was
very clear after working with it the classic issue of not enough CPU or bits to do it
well.? Getting a ATMEGA328 to do that was pretty amazing but it was not just quite
there.
?
The problem was basic.? The math was perfect,? the micros needed to be able to do
it with enough precision and fast enough.? That they appeared is not new or a surprise
as us that have been in tech could foresee that.
?
I still have the brassboard I made up to separate the RX functions from the TX so I could?
study it and really probe deep.? I came very close to using a STM32F4xx but round that
time there were other things in my life demanded attention.? I thrilled that my initial
thoughts of more and better a/d as well as d/a and cpu needed were proven.
?
One remarkable thing that came from the brassboard was double sideband AM
that was only hampered but the lack of bits (A/D and D/A).? All the micro had to
do was drive the 5351 for a base carrier.
?
As to SGC 500w amp it also failed they made some and they worked but never
really caught hold.? As an amp its easy to limit the RF for analog phase data/drive
and extract amplitude from a already produced SSB signal.? I suspect the amount
of analog power hardware was part of the issue.
--
Allison
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