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Re: LF: WOLF bandwidth suggestions

To: [email protected]
Subject: Re: LF: WOLF bandwidth suggestions
From: "Rik Strobbe" <[email protected]>
Date: Tue, 17 Apr 2001 08:58:47
In-reply-to: <[email protected]>
Reply-to: [email protected]
Sender: <[email protected]>
Hi Marcus & group,

1. WOLF is using cosine-shaped zero-crossings with a risetime of only 5 ms, which causes a few extra sidebands on each side of the spectrum. I'd prefer to extend the cosine-envelope to the full symbol duration (like in PSK31), then ideally only the 10 Hz wide main spectral lobe would persist. At a
given
PEP level and with 50% phase transitions, on average we'd lose only 0.8 dB SNR while saving 24% transmitted energy.
You are right about the average value, but for a '0101' sequence the signal
will be 3dB down. And as it is of very little use if you can decode
sequences like '111000111' but you cannot decode a '010101010' sequence I
believe that that the effective loss of SNR is 3dB, even if the average
power is only 0.8dB down.

73, Rik  ON7YD



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