Hello Wolf and all,
I'm not shure about my idea, coming from experience in linear world BPSK
modulation, but I suggest to others my think.
BPSK modulation consist in multiplying a carrier for +1 or -1, according to
data bit to be transmitted (don't forget differential coding...).
If the carrier is injected into the first port of a four quadrant
analog multiplier end data to be transmitted (a square wave) is injected into
the other port but whith rise and falling edge smoothed with a time constant of
3 or 4 or more carrier cycles (trapezoidal wave), the output is a BPSK with slow
phase change.
My experience can't help about what happen when this signal is passed throu a
non linear (hard limiting) stage.
73 de Claudio, ik2pii
On 13-Dec-00 [email protected] wrote:
Hello Andy, Steward and others,
I also think that modifying the PSK generator with a 'slow phase change' as
suggested by Steward (KK7KA) is a very good idea so we don't need linear
transmitters / transverters for this task. I will try to program a kind of
"test generator" (no real PSK modulator) to see what the spectrum looks
like.
Or has someone done this before so we don't have to invent the wheel twice ?
73's Wolf (DL4YHF)
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Claudio Pozzi http://www.qsl.net/ik2pii happy Linux user
E-Mail: Claudio <[email protected]> <[email protected]>
Date: 17-Dec-00 Time: 20:04:41
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