Policy is often dictated by practice. Since there is no FT8 v JT65 dynamic
because mostly everyone on FT8 was on JT65, the trend recently has been to
extend into the JT65 section on crowded bands. It is happening. It is working.
Use just need to use your VFO or open your filters.
Erik.
From: Tsutsumi Takehiko [mailto:ja5...@outlook.com]
Sent: 22 November 2017 07:13
To: WSJT software development <wsjt-devel@lists.sourceforge.net>
Subject: Re: [wsjt-devel] Feature Request of FT8 TX Frequency limitation less
than 2kHz
Hi Black, Gary, Libor, Richard, Eric,
Thank you for your comments to my proposal.
I updated my proposal based on your comments as follow.
-----------------------------------------------------------------------------------------------------------------------------------------------------
Please expand FT8 channel width from 2kHz to 2.5KHz, reduce JT65 channel width
from 2.0kHz to 1.5kHz and add the feature to limit FT8 TX frequency less than
2.5kHz at the next GA release. We also need to appeal to radio amateur society
and regulatory bodies to be able to expand total wsjt-x channel, i.e. total
5kHz considering popularity of wsjt-x formats and adaptation among major
DX-peditions.
Reasons are stated as follow.
1. The working frequency table was and is designed and planned that the width
of FT8 is 2kHz. However, the limitation feature of 2kHz to the operator has not
implemented to wsjt-x software.
2. Recently we observe above 2kHz communication practice by operators who does
not know above design concept and the interference to adjacent wsjt-x channel
such as JT65 is created.
3. Considering FT8 traffic expansion and JT65 traffic reduction trend, it is
appropriate for FT8 channel width to 2.5KHz and for JT65 channel width to
1.5kHz.
4. Such TX frequency limitation practice is implemented to JT65 operation at
30m to protect WSPR channel in wsjt-x software.
-----------------------------------------------------------------------------------------------------------------------------------------------------
Thank you again for your comments.
Regards,
take
de JA5AEA
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