[Elecraft] [K3] Filters for mixed JT65 and JT9 HF

[Don Wilhelm]

BUT,

The filter that must be specified for DATA mode TX is the 2.7 (or 2.8) 
kHz filter.  You cannot use the wider filters for DATA mode transmit - 
the firmware prevents it (unless you lie to the K3 about which filter is 
which width).  You can use a wider filter for receive, but that does not 
help transmit.  The transmit audio width is fixed by the DSP, so a wider 
filter will not increase that limit.

What is wrong with using the split arrangement that is provided by the 
computer software - no "work-arounds" needed, it makes everything 
seamless, and can automatically put the K3 into split mode.

73,
Don W3FPR

On 10/7/2013 7:31 PM, Charlie T, K3ICH wrote:
> I believe that figure of 3400 Hz is the AUDIO bandwidth which is 
> equivalent to an AM bandwidth twice that, or 6.8 kHz.  If I am 
> correct, then you can most certainly take advantage of your 6 kHz AM 
> filter which will limit your broadcast audio bandwidth to 3.0 kHz.  
> The 15 kHz filter will get you an extra 400 Hz.of audio, but is 
> probably not practical due to the excessive bandwidth.  Save that one 
> for FM.
>