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

[Joe Subich, W4TV]

On 10/7/2013 4:39 PM, Bob wrote:
> Just be aware that current DSP firmware in the K3 limits the receive
> bandwidth to something around 3400 Hz. So even if you have a wider
> filter, like the 6 KHz AM filter, you will not be able to utilize the
> full 4 KHz bandwidth of WSJT-X for JT65/MT9 modes.

Absolutely *not* true ... I regularly receive 200 to 2400 Hz in DATA A
with the FM (or AM) filter.  It is simply a matter of adjusting the
High and Low cut frequencies to 200/4200 or shift/Width to 2200/4000.

I have been doing that ever since K1JT offered me a pre-release look
at the "wideband" decoding support in WSJT-X with no issues other than
some CAT problems with the interface to CI-V Commander from DXLab
Suite which K1JT and AA6YQ resolved quite quickly.

73,

    ... Joe, W4TV


On 10/7/2013 4:39 PM, Bob wrote:
> Just be aware that current DSP firmware in the K3 limits the receive
> bandwidth to something around 3400 Hz.  So even if you have a wider filter,
> like the 6 KHz AM filter, you will not be able to utilize the full 4 KHz
> bandwidth of WSJT-X for JT65/MT9 modes.
>
> Lyle is aware of this issue and it is on his list to work on in the future.
>
> And even if you are in Split mode, rest assured that you know exactly where
> you are transmitting -- on the exact audio offset indicated on the display.
>   Operating Split is the way to go.  The only drawback I've seen is that
> WSJT-X does nothing to make sure the K3 is in the Split mode, it just
> assumes it is.
>
> 73, Bob, WB4SON
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