[Elecraft] K3 PSK31 with Digipan

[Joe Subich, W4TV]

> 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.

Perhaps all of the data modes should be limited to 2.8 KHz 
of DSP bandwidth (or even 2 KHz).  That's more than enough 
for any reasonable amateur data mode and will keep users from 
shooting themselves in the foot. 



> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net 
> [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of zibs
> Sent: Friday, September 19, 2008 10:28 AM
> To: elecraft at mailman.qth.net
> Subject: Re: [Elecraft] K3 PSK31 with Digipan
> 
> 
> 
> 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.
> > 
> > 73,
> > 
> > Lyle KK7P
> > 
> > 
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