[linrad] Re: OT Information required

[Richard <blueyonder.co.uk; richard.bown@xxxxxxxxxxxxxxxx>]

On Mon, 22 Oct 2007 13:25:47 +0200
Leif Asbrink <leif@xxxxxxxxxx> wrote:

> Hi Richard,
> 
> > Leif if you could let me know if there are any major new features
> > with Linrad ?
> 
> New in relation to what?
> On your site I find:
> 
> very powerful application for very weak signal use.
> Needs a intuitive GUI V Good , but diificult to use
> http://www.nitehawk.com/sm5bsz/linuxdsp/linrad.htm
> 
> No features are mentioned, so in relation to this all
> would be new;-)
> 
> 
> First of all, Linrad is different from most other 
> softwares in that it does not make many assumptions 
> about what the user wants to do or what kind of hardware
> he wants to use. This is why Linrad looks so difficult to
> newcomers. 
> 
> On the other hand, for someone using "standard hardware"
> it is possible to download a complete setup in which
> everything is configures for some particular usage.
> Here are a few examples:
> http://www.sm5bsz.com/linuxdsp/usage/examples.htm
> 
> The main features:
> 
> 1) One or two RF channels (For X-pol or electronic 
> antenna beam forming) Linrad will optimise for best
> S/N automatically on a single signal in random noise.
> Manual control for other situations.
> 
> 2) Input from soundcard, SDFR-14, SDR-IQ, network or
> disk file.
> 
> 3) Output of processed signal to soundcard or .wav file
> plus Wideband data to disk file or network.
> 
> 4) Calibration to provide a flat frequency response to
> within 0.1 dB or better. This allows signals with (S+N)/N
> well below 0.1 dB to be seen on the waterfall over a very
> wide frequency range with very long averaging times since
> the entire colour scale does not have to be wider than 0.1 dB.
> 
> 5) Advanced noise blanker. 
> 
> 6) Spur removal. Thousands of very narrow notches can be 
> applied to suppress frequency-stable carriers.  
> 
> 7) Advanced AFC allows usage of narrow bandwidths on
> extremely weak and unstable CW signals.
> 
> 8) Coherent processing for the baseband. For CW and AM
> (and possibly NBFM) there is a carrier that Linrad 
> recovers and then uses to get a reference phase. Several
> ways of processing possible to take advantage of our
> two ears.
> 
> 9) Audio expander, amplitude limiter selectable in Hilbert
> space or directly on the real-valued signal. 
> 
> 10) AGC selectable attack and release times, insensitive to
> gigant QRN pulses.
> 
> The programs MAP65 by K1JT and watzo by myself can use the
> network wideband output from Linrad for their tasks.
> Linrad is very easy to compile from source code under both
> Linux and Windows and the user can add his own routines
> to control his own hardware. Sample routines for IC-275,
> IC-706, FT-1000, FT-736, TS-850 and TS-2000 are supplied in
> the source code package.
> 
> 
> 73
> 
> Leif / SM5BSZ
>

I'll add the features you have listed above Leif
Thanks
-- 

Best Wishes

Richard Bown

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Registered Linux User 365161
OS Mandriva 2008.0 Kernel 2.6.22.9-desktop-1mdv
HAM Callsign G8JVM : Locator IO82SP
QRV all bands 80mtrs to 3 cms ,( non WARC )
http://www.software-radio.org.uk
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


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