[Elecraft] K3 PSK31 with Digipan

[Don Wilhelm]

Steve,

I would think that most users are aware that they are transmitting 
through the 2.7 kHz (or 2.8) filter - after all, they set it up that way 
in the menu (and if they did not, they would get a TX FL error message).
So I should think that they would not expect to transmit an audio tone 
outside the bounds of that filter.
If the user has configured a wider filter for receive than for transmit, 
the "problem" you state should be fairly obvious.
The signal outside the 2.7 kHz bandpass will be significantly weaker 
than if it were inside the passband.  The soundcard may still be able to 
decode it, but I see nothing that really needs any kind of alert in the 
manual, it is simply a natural consequence of 'how things work'.

73,
Don W3FPR

zibs wrote:
> But in Data A mode, one can expand the receive width out to 4 kHz using the
> 2.7 kHz filter. If you attempt to transmit below 200 or above 2800 Hz, power
> output will drop to zero.
>
> The user needs to be aware when clicking on the waterfall as one can receive
> signals on frequencies in which they cannot transmit.
>
> Steve N9SZ
>
>
>
> Lyle Johnson wrote:
>   
>>  > Just getting my new K3 working on PSK31 and noticed that it seems to be
>>  > > important to limit the range of the transmit frequency...
>>
>> I just swept my K3 in DATA A mode.using the LINE IN jack for sourcing
>> the Tx audio.  It is flat from below 200 Hz to higher than 2800 Hz
>> using a 2.,8 kHz IF filter.
>>
>> Be sure you don't have TxEQ set to restrict the transmit bandwidth.
>> TxEQ is active for *all* Tx audio paths in all modes.  For DATA A or
>> DATA AFSK, it should be flat.
>>     
>