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LF: Phase-coherent CW and DFCW

To: [email protected]
Subject: LF: Phase-coherent CW and DFCW
From: [email protected]
Date: Sun, 11 Feb 2001 21:15:36 EST
Reply-to: [email protected]
Sender: <[email protected]>
Hi group,

Apropos DBF39 non-phase-coherence:

Reminds me of an issue which has been brought up here about the possibility of very narrowband-detection of the carrier-component of (higher data rate) CW and DFCW.

- To preserve the phase during normal-CW key up, you simply have to leave your (stable) oscillator running, including frequency dividers (!). Multipliers and the m-dividers of a m/n-PLL can be blanked though.

- For DFCW with a single oscillator, the phase difference accumulated during each frequency-switching period has to be an integer multiple of 360°. This can be achieved by choosing the symbol length (eg. 4 s) and the frequency shift (eg. 4 Hz) such that their product becomes an integer number (16).

73s de Markus, DF6NM


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