Topband: Top Band and JT65

[Mike va3mw]

JT9 vs JT65 over CW

The same conversation happened when SSB started to gain strength over AM. 

73

Mike va3mw

> On May 13, 2017, at 7:39 PM, Mike Waters <mikewate at gmail.com> wrote:
> 
> That's interesting. Thank you for sharing that with us.
> 
> What software are you using, Brian? Joe Taylor's, or some other?
> 
> I'm guessing you're only using the wide SSB filter. In any case, I'll have
> to try that and see, using CW and SSB filters.
> 
> 73, Mike
> www.w0btu.com
> 
> On Sat, May 13, 2017 at 5:50 PM, Brian D G3VGZ <topband at planet3.freeuk.co.uk
>> wrote:
> 
>> 
>> I find the better ability for JT65 to decode co-channel signals with its
>> two
>> pass decoding makes up for any 2dB improvement in decoding JT9. I also find
>> a single static crash can take out JT9 decodes, more so than JT65.
>> 
>>>> Why not JT9? It has a 2 dB improvement in S/N ratio on 160, while using
>>>> only 1/10 of the bandwidth.
>>>> 
>>>> I cannot understand why JT9 is used so little on 160 thru 20. JT65 is a
>>>> VHF mode.
>>>> 
>>>> physics.princeton.edu/pulsar/K1JT/wsjtx.html
>> 
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