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

To: rsgb_lf_group@blacksheep.org
Subject: Re: LF: DDS Source board (was DFCW parameters)
From: G0MRF@aol.com
Date: Wed, 10 May 2000 09:05:17 EDT
Reply-to: rsgb_lf_group@blacksheep.org
Sender: <majordom@post.thorcom.com>
In a message dated 5/10/00 12:14:48 PM GMT Daylight Time, ACTALBOT@dera.gov.uk 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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