Return to KLUBNL.PL main page

rsgb_lf_group
[Top] [All Lists]

Re: LF: Answers to some JT9 questions

To: [email protected]
Subject: Re: LF: Answers to some JT9 questions
From: Stefan Schäfer <[email protected]>
Date: Sun, 28 Oct 2012 14:29:40 +0100
In-reply-to: <[email protected]>
References: <[email protected]>
Reply-to: [email protected]
Sender: [email protected]
User-agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3

Hello Joe,

Here you are, that's nice :-)

Thanks for your work and development and quick updates of JT9 for LF/MF use! Certainly there will be impressive distances covered in JT9 during this winter season.

The mapping feature as in WSPR is an important motivation i think, both for RX and the TX stations!

I will now prepare for a JT9-30 transmission on 137.43 kHz, running this until tomorrow 6 UTC.

73! Stefan/DK7FC

Am 28.10.2012 14:15, schrieb Joe Taylor:
GM/GA all,

1. Alberto/I2PHD and others have asked whether details of the JT9 protocol are described somewhere. At present the only full description is the one implicitly contained in the source code, which is openly available at http://developer.berlios.de/projects/wsjt/ . In due course I will provide a summary document describing the source encoding, error-control coding, interleaving and bit-ordering scheme, and modulation details. (At this point it's possible that a few of these things could still change, depending on user feedback.)

2. Roger/G3XBM and others asked whether a WSPRnet-like database might be made available. Yes, this could be useful, and in principle WSPRnet itself could accept reception reports from WSJT-X. I will give some thought to adding such a feature, and I'll consider having WSJT-X support standard WSPR-format messages such as "WA1ABC FN42 37". I should mention, however, that the principal intent of JT9 and WSJT-X is to enable 2-way QSOs at MF and LF, with very narrow bandwidths and very weak signals. In the longer term, I do not wish that our MF/LF frequencies will be used mostly for beacon-like transmissions.

3. WSJT-X will continue to evolve in coming weeks. The JT9 decoder is not yet fully optimized, and other enhancements are in the works, as well. Surely there will be bugs in the early program releases: bug reports and requests for new features will be most welcome!

-- 73, Joe, K1JT


<Prev in Thread] Current Thread [Next in Thread>