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LF: <Tech> Re: PSK Tx solution?

To: [email protected]
Subject: LF: <Tech> Re: PSK Tx solution?
From: "James Moritz" <[email protected]>
Date: Mon, 2 Apr 2001 17:54:48 +0000
Organization: University of Hertfordshire
Reply-to: [email protected]
Sender: <[email protected]>
<?color><?param0100,0100,0100>Dear Mike, LF group,<br><br>G3XDV wrote:<br>&gt;<?/color>My understanding is that for voice transmissions NBFM and &gt;phase mod are differently achieved but result in roughly the same &gt;mathematics so can be demodulated as if they were identical. <br>&gt;In the same way, can we achieve the same effect as PSK by &gt;doing something with the frequency instead? If so, linearity is not &gt;an issue.<br><br>That's exactly what my prototype circuit is aiming to do. So far, it demonstrates that BPSK-like signals with constant amplitude (and therefore not requiring a linear amp) can be generated with acceptable sidebands using a phase modulator. These signals could be viewed mathematically as either phase- or frequency modulation. However, to obtain the benefits of coherent signal detection, it is neccesary to preserve a definite fixed relationship between the phase of the modulated signal, and a reference phase (the carrier). Practical p hase modulators do this, but practical analogue frequency modulators (basically voltage controlled oscillators) don't.<br><br>So far so good, but now the question is are these phase-modulated signals compatible with BPSK as far as reception is concerned? That's the next stage in the experiment....<br><br>Cheers, Jim Moritz<br>73 de M0BMU<br><br><br>
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