[Elecraft] K4

[Joe Subich, W4TV]

WSJT-X very elegantly uses split to offset the TX VFO an adjust
the transmit audio tone (subcarrier) to keep the tone frequency
between 1500 - 2000 Hz throughout the entire 4 KHz receive pass-
band.  There is no need (or justification) for a wider transmit
bandwidth.

73,

    ... Joe, W4TV


On 2018-05-19 8:07 AM, Ed W0YK wrote:
> That's  fine for decode, but transmit uses the 2.8 kHz filter.
> 73,Ed W0YK
> -------- Original message --------From: "Joe Subich, W4TV" <lists at subich.com> Date: 5/19/18  8:01 AM  (GMT-05:00) To: elecraft at mailman.qth.net Subject: Re: [Elecraft] K4
> Ed,
> 
>   > 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.
> Absolutely not true.  All it takes is the KFL3B-FM of KFL3A-6K filter.
> I regularly decode the entire 4 KHz combined JT65/JT9 segment or more
> than 3 KHz of FT8 activity.
> 
> 73,
> 
>      ... Joe, W4TV
> 
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