>
> Dear Tom, I was searching for info about the K6STI DSP
> and these two links are the only ones I found with any
> info. Did he quit selling the unit? there doesn't seem
> to be any info since 1997.
>
Brian K6STI seems to be reachable at [EMAIL PROTECTED], at least this is
the address he has used when posting to some newsgroups. I have been
told that in the early 90s he left his job and invested some money in
the development of his famous RTTY program, which he distributed both
in demo version and in a registered, not time limited, version.
Unfortunately the demo version was quickly hacked, and the time limit
removed. So he lost a lot of money, and he got so angry to make him
decide to abandon completely the development of ham programs. A few
years ago he didn't even answer to emails regarding his software, or
at least I have been so told.
In his DSPblaster program, which in the past I have used, he does a
coherent CW demodulation, generating the I and Q component. This is
equivalent to case 1) of my previous message, with the LO set at the
frequency of the audio CW signal incoming from the Rx. He then allows
to listen separately to the I and Q channels. But this has nothing to
do with the need of an external quadrature mixer for separating the
wanted from the unwanted sideband. There is no way out, unless the
external hardware operates in quadrature, no software magics can
recreate those I/Q components that haven't been generated by the
hardware, and the two sidebands are by now irremediably mixed together.
73 Alberto I2PHD
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