Although FT8 has "intruded" on the lower part of the normal JT65 spot I don't
see it as a problem.There aren't that many JT65's out there...and, in the past,
I've seen plenty of JT65's "intruding" on the JT9 area.It's quite natural to
bump up the 2kHz limit when the band is crowded. ALl has to do with the
average bandwidth of a receiver typically being 2400 and higher. So far don't
think I've seen any FT8's above 2500.
The only reason WSPR is excluded is because the same people that wrote WSPR
also wrote WSJT-X...otherwise it probably would not be excluded (e.g. there are
other JT65 programs that don't excluded the WSPR area ).
de Mike W9MDB
On Monday, November 20, 2017, 11:10:15 PM CST, Tsutsumi Takehiko
<ja5...@outlook.com> wrote:
Hi all,
It is great to observe the popularity of FT8 format among non-wsjt-x experience
in the past and I have a proposal to add the following feature for these.
If I miss any consideration to my proposal, I welcome your comments.
Regards,
take
de JA5AEA
-----------------------------------------------------------------------------------------------------------------------------------------------------
Please add the feature to limit FT8 TX frequency less than 2kHz.
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. Such TX frequency limitation practice is implemented to JT65 operation at
30m to protect WSPR channel in wsjt-x software.
Some may object the implementation by the recent FT8 traffic expansion. But my
position is that these traffic un-balanced problem should be separately solved
by the optimization work of the working frequency table in near future.
Sent from Mail for Windows 10
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