[Elecraft] K3 PSK31 with Digipan

[Dave Quick - KØEKL]

Quite true and when in qso I do try to center the desired signal in the
passband and when the qrm is bad the K3 absolutely shines! It's so much fun
to turn that knob, narrow the passband to a sliver of spectrum and see and
hear every other signal disappear. 

Still, it would be nice to be able to at least see the full 6 KHz. Sort of
like a mini-panadaptor. Perhaps it's time to order and LP-Pan!



-----Original Message-----
From: Don Wilhelm [mailto:w3fpr at embarqmail.com] 
Sent: Friday, September 19, 2008 2:36 PM
To: Dave Quick - KØEKL
Cc: elecraft at mailman.qth.net
Subject: Re: [Elecraft] K3 PSK31 with Digipan

Dave,

OTOH, best results with AFSK is to use a narrow receive filter.  It keeps
strong undesired signals out of the passband.
Strong undesired signals in the passband cause a reduction of receiver gain
because the AGC reacts to them.
Sure, the computer can handle and display them, but if the receiver gain is
reduced because of a strong signal that just came on, your chances of
maintaining solid print is reduced.

Do as you choose, but I prefer to tune my data mode signals just like any
other - with the VFO knob, and use a narrow filter to get rid of the 'other
trash' on the band.

73,
Don W3FPR


Dave Quick - KØEKL wrote:
> I'd like to be able to transmit in Data-A mode through my 6 Khz AM filter.
> Being able to see ~6 Khz of spectrum in the waterfall window would be
great.
>
> -Dave Quick KØEKL
>
>
>
>
> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net 
> [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Joe Subich, 
> W4TV
> Sent: Friday, September 19, 2008 11:55 AM
> To: 'zibs'; 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.
>>     
>
> 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.
>
>
>
>   
>