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

[Joe Subich, W4TV]

 > Absolutely *not* true ... I regularly receive 200 to 2400 Hz in DATA A
 > with the FM (or AM) filter.

Correction ... 200 to 4200 Hz


73,

    ... Joe, W4TV


On 10/7/2013 4:51 PM, Joe Subich, W4TV wrote:
>
> 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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