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| To: | "*[email protected]" <[email protected]> |
|---|---|
| Subject: | Re: LF: Fwd: JT9-2 failed now JT9-1 500khz + 1400hz |
| From: | Joe Taylor <[email protected]> |
| Date: | Sun, 18 Nov 2012 19:38:39 -0500 |
| In-reply-to: | <[email protected]> |
| References: | <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> |
| Reply-to: | [email protected] |
| Sender: | [email protected] |
| User-agent: | Mozilla/5.0 (Windows NT 6.1; rv:6.0) Gecko/20110812 Thunderbird/6.0 |
Hi Eddie, Tobias, and all,I've solved the riddle of Eddie's local JT9-2 transmissions that failed to decode. The problem is, as originally suspected, the result of small frequency drifts -- in this case acting together with the Gray-coding applied to the data. I will work on a solution this week, including an appropriate algorithm for measuring and removing small amounts of frequency drift as part of the decoding process. In the meantime, if you're experiencing this problem it's best to stick with JT9-1 because that sub-mode has the largest tone spacing.
-- 73, Joe, K1JT
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