On 5/18/2018 7:43 PM, Ed W0YK wrote:
There are ham reasons for this request, which I made to Wayne 2 years
ago. We need a bit more RX/TX bandwidth for the combined JT65/9 modes.
With WSJT, the upper end of the JT9 audio range is not available on
the K3.
Hi Ed,
FWIW, I regularly copied JT9 signals up to at least 3 kHz; remember
that, in those days, JT9 typically started around 2 kHz baseband, and it
is possible to open up the RX IF bandwidth wider than that 2.8 kHz
roofing filter.
And although the worm will hopefully turn back in favor of JT65/JT9 on
160M, those modes have virtually disappeared since FT8 was introduced.
Last season, you, W6GJB, and I all worked SM6 on JT65, and WSJT-X
decoder logged several dozen EU stations. This year, I hear east coast
stations working (or at least calling) EU, but I've decoded ZERO EU
using FT8. (For those reading the mail, all three of us are within about
20 miles of each other, 70 miles S of San Francisco. What I'd love to
see is JT9 take over on 160M. If I'm not mistaken, it's good about 10 dB
deeper into the noise than FT8.
And while it's true that any of the slow WSJT modes would benefit from
greater IF and audio bandwidth by providing space for more stations, few
other rigs offer that.
73, Jim K9YC
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