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K1JT Joeさんに送ったメール2018年02月27日 14時30分44秒

6m bandのJT65 , FT8 の周波数についての考察を一つ前の記事で書いてみました。

WSJT-X の作者の K1JT Joeさんに提案をすべくメールを出してみました。難しいことは書けませんので簡単な内容で書きましたが、意図は分かっていただけると思います。

とりあえずメール開封は帰ってきました。どうなるでしょうか。

送った内容は以下のとおりです。

Hello Joe-san. I am a Japanese Ham Radio Operator, JP1LRT Yoshiharu Tsukuura.

I am a user of WSJT-X. First of all I would like to thank you.
WSJT-X is a very cool and amazing software. I enjoy digital communication every day.

And I am a 6m band CRAZY. Last Summer, I did make a SUPER DX QSO on 6m band with JT65. So many people saw an incredible QSO. It was not a short-range communication with a neighbor country but a super-long distance communication across the continent.
With SSB or CW, we do not have many opportunities. But with JT65, we could make a QSO even a few, very weak openings.

Extreme multi-hop ES with JT65 , it was an amazing world.

However, there were two problems.
1.TX/RX sequence

When the strong station transmits in the receiving sequence, weak radio waves arriving across the continent have been covered and not decodable.
So we, Japanese people did try an attempt to unify the transmission sequence to the odd number side. Many Japanese agreed with the attempt, so we were able to get a quiet receiving environment.

2.QRM from domestic QSO or short range international QSO with neighboring country

This is a BIG PROBLEM. These signals are very strong. The station that cannot receive a DX signal start DOMESTIC QSO on the same DF of SUPER DX station.... We witnessed such a tragic scene many times last summer.
So we tried to separate frequencies between domestic communication and international communication. But we did not have much time to announce it, and the season of the extreme multi-hop Es has ended.

The 6m band in summer is very special. It differs from any frequency in the HF band.

So I have a suggestion.

I'd like you to establish a frequency for intercontinental communication of the 6m band at the official frequency of WSJT-X.

Currently 50.276MHz is set for JT65 and 50.313MHz is set for FT8.
Designate them as frequencies for short-distance communication with domestic and neighboring countries, and newly establish frequencies for long-distance intercontinental communication.

For example, for long-distance intercontinental communication with JT65 is 50.273MHz , with FT8 is 50.316MHz. This is only an example.

QRM from a domestic or short range international QSO, this problem happens both in Europe and the United States.

If WSJT-X does a new frequency setting for 6m band DX, this problem can be solved. Also, most of all 6 meters of digital communication enthusiasts will support this policy.

How do you think? Please contact your development team and your friends' 6m band lovers.

There are three months until the beginning of the extreme multi-hop Es season. We have enough time to announce it. Please consider about it.

I hope to see you on the air Joe-san.

Thank you for reading.

Best regards

JP1LRT Yoshiharu Tsukuura

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