In a message dated 5/10/00 12:14:48 PM GMT Daylight Time,
[email protected] writes:
<< WINDOZE programming makes it more difficult to address PC
I/O ports directly than was DOS.
Dave 'MRF, when you say linear BPSK what do you mean ? There is no
option to shape the waveform surely with only 0 / 180 and no signal
states. >>
Andy.
Sorry, "linear" in this context.....
A BPSK Input pin Which:
When presented with a DC voltage equivalent to half the supply line voltage
will result in a balanced condition producing zero RF output.
Changing the voltage on the BPSK input pin slowly from eg 6V to 12V will
generate a slowly increasing level of Q output which reaches a maximum at
12V.
i.e. The instantaneous amplitude of the output is proportional to the
instantaneous voltage on the BPSK input pin.
Hence you can control the rise / fall times / waveshaping by accuratly
shaping the voltage applied to the BPSK input.
Changing from half rail to 0V produces the opposite phase. (not Q)
Sorry this is such a long reply. I didn't have time to write a short one.
73
David
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