[Elecraft] K3 6KHz Filter and Data Modes

[Joe Subich, W4TV]

On 9/1/2013 1:10 PM, Matt VK2RQ wrote:
 > But what about the bandwidth on the TX side?

Not a factor.  With WSJT-X the rig is placed in *split* mode
and the program adjusts the transmit frequency to allow the
transmit audio to be generated between 1500 and 2000 Hz.
Thus if the receiver is tuned to 14.076 and one is working a
JT9 station with a receive "tone" of 3880 Hz (14.079.880) the
transmitter will be set to 14.078 and the transmit audio will
be 1880 Hz.

Similarly, if one is working a JT65 station with a receive
"tone" of 495 Hz (14.076.495), the transmitter will be set
to 14.074.5 and the transmit audio will be 1995 Hz.

73,

    ... Joe, W4TV


On 9/1/2013 1:10 PM, Matt VK2RQ wrote:
> But what about the bandwidth on the TX side? Can you use DATA mode, or perhaps use ESSB wide SSB?
>
> 73, Matt VK2RQ
>
> On 02/09/2013, at 2:53 AM, "Joe Subich, W4TV" <lists at subich.com> wrote:
>
>>
>> There is a 4.2 KHz lowpass filter in the audio chain to the headphones
>> and speaker but it is not present on the "Line Out".  I regularly use
>> the FM (13 KHz) IF filter for WSJT-X and see 200 - 4200 Hz when the
>> DSP is adjusted correctly.
>>
>>
>> 73,
>>
>>    ... Joe, W4TV
>>
>>
>> On 9/1/2013 11:49 AM, Bob wrote:
>>> Hey,
>>>
>>> My widest filter is currently a 2.8 KHz on the main board.  If I understand
>>> things correctly, if I shift all the filters over a spot, then pop in a
>>> 6KHz AM filter for FL1, I can use that for TX and RX Data modes.
>>>
>>> The reason I ask is that the WSJT-X program is now supporting a full 4KHz
>>> wide waterfall that allows both JT65 and Jt9 QSOs.  With my current filter
>>> I can clearly see the upper end cuts off around 2900 Hz.
>>>
>>> So my question is would there be anything else in the audio or DSP chain
>>> that would prevent me from using the full 4KHz of WSJT-X while in DATA
>>> modes if I have a wider filter in slot FL1?
>>>
>>> Thanks in advance,
>>>
>>> 73, Bob, WB4SON
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