[Lf] Re: CW filter and Laptops

[Frank Gentges]

Andre'

Comments follow....

On Sun, 30 Jan 2000, Andre' Kesteloot wrote:

> Frank Gentges wrote:
> 
> > Those who have sat through my rantings the past two weeks at tacos knows
> > that I want a good CW filter to go with the LF receiving setup we have
> > been evolving with the RX320 and spectran.  Tonight I had a chance to
> > revisit Hamview which is the predicesor of Spectran.  It uses full duplex
> > sound card capability to send processed sound out of the analysis program
> > while at the same time receiving sound from the receiver.
> 
> a) What kinds of sound-card are those built in laptops nowadays? Mono or
> stereo?  Mine has a stereo input plug (which of course, means nothing)

Both my Toshiba Satellite Pro 425 and IBM ThinkPad 1452 have full duplex 
stereo sound cards.  You can tell if it is full duplex when Spectran 
outputs audio when the volume is turned up on the left side.

> b) whatever we develop either for LF, or even mobile work in general, will
> almost   _have_   to be for laptops. Not only are laptops becoming more and more
> powerful, but with increasing noise levels, etc., I would think that moving your
> computer to other locations within the home, and driving to places where noise
> will be minimal (such as parks, mountain tops etc.) will become mandatory

Laptops are so much more portable so I agree.

> c) most modern laptops are essentially bordeline Tempest

Yes, and therefore good for operating next to an LF receiver.

> d) why would an external box with extra dsp capabilities be less 
acceptable than using a stereo card ?

If we can get similar performance for the PC software we don't have to 
add another box and its expense.  That is why I was so impressed with 
Hamview on my second look last night.  I had forgotten how good it was.  
Alberto and Vittorio speak about adding this feature to Spectran.  I am 
salivating over the possibilities.

Frank K0BRA

> 73
> Andre'
> 
> 
>