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Re: LF: DDS Source board (was DFCW parameters)

To: [email protected]
Subject: Re: LF: DDS Source board (was DFCW parameters)
From: [email protected]
Date: Wed, 10 May 2000 09:05:17 EDT
Reply-to: [email protected]
Sender: <[email protected]>
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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