Bill,Thank you. That was pretty much what I thought. The subject came up in a discussion with Lance, W7GJ, who used to recommend its use by stations attempting to work his EME DXpeditions, but now does not, since there is no way for the multiple calling stations to reliably know when to clear their averages. I think even as a DX station Lance finds the current feature of limited use, since "Clear Avg" clears the entire spectrum. Lance can speak for himself, but I think a feature he would like is a frequency-selective average-clearing function, one in which he can clear, say, the spectrum of a station he is working while continuing to average the rest of the spectrum (and thereby save precious moonrise or moonset time of other callers).Ed N4II. -------- Original message --------From: Bill Somerville <[email protected]> Date: 8/11/19 4:05 PM (GMT-05:00) To: [email protected] Subject: Re: [wsjt-devel] Message averaging? On 11/08/2019 19:07, [email protected] wrote: Is there someone on this reflector who knows the intended application of the JT65 message averaging feature? Does it have any intended use other than in a one-on-one scheduled QSO? I’m just trying to think of scenarios where it would be useful, i.e., where the user would know when to press the “Clear Avg” button. Ed N4II. Hi Ed, the message averaging should be cleared once a message has been successfully decoded. It is most useful in marginal EME QSOs which are often scheduled contacts, but I don't see why it cannot be used for any JT65 contact with two stations working each other as the only stations on the frequency. All the message averaging is doing is accumulating multiple decode attempts that have sync but not necessarily successful decodes individually. By summing the symbol energies across Rx periods and taking a running average a successful decode may be forthcoming that could not be obtained from any of the individual Rx periods. Message averaging requires the operator to be aware of what it is doing. As you infer, clearing the running average judiciously is part of the overall operating skill when using it. For example when quitting a QSO attempt or changing frequency the average must be cleared otherwise unnecessary false decodes are likely. 73 Bill G4WJS.
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