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leif-NjylAwyOilXQT0dZR+AlfA@public.gmane.org | 1 Mar 17:23

Linrad-02.02

Hi all,

Thanks to feedback from Ermanno, IK7EZN I observed that
the blanker could be improved. The blanker of Linrad-02.02 
is more efficient on high rates of very weak pulses as
compared to previous Linrad versions.

Thanks to feedback from Roger, W3SZ, Linrad-02.02 now
has a user option to select to process a stereo .wav
recording as I/Q data rather than two RF channels.

I have not made any other changes so all the multi-thread
related problems of 02-01 are still present.

Files are at the bottom of:
http://www.sm5bsz.com/linuxdsp/linroot.htm

73

Leif

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Rein A. Smit | 1 Mar 23:54
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linrad distribution ( for IK2DDR???)

Hello Francesco  ( ? )

My apologies but I misplaced your email from a few hours ago
about your Linrad user data. Could you please re-send the data?

73 Rein W6/PA0ZN

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Rein A. Smit | 2 Mar 00:29
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New Linrad data contribution.

Hello All,

Frncesco, IK2DDR,  has contributed his Linrad installation data to the 
Data Bank.

   http://www.nitehawk.com/linrad_dat/

Thanks Francesco.

Sorry for the confusion...

73 Rein W6/PA0ZN

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Richard Hosking | 2 Mar 00:35
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Re: Winrad V0.90

Yes I dont know what the upper limit of those data swithches is, but it 
sure wouldnt be 432 MHz. I will probably be looking at up 30 MHz max

Richard

m0eme Paul wrote:

> Thanks Richard I take it you are taking about HF here????? I wish to 
> use it for eme on 432mhz
>
>
>
> ----- Original Message ----- From: "Richard Hosking" 
> <richardh@...>
> To: "Linrad mailinglist" <linrad@...>
> Sent: Monday, February 27, 2006 12:25 PM
> Subject: [linrad] Re: Winrad V0.90
>
>
>> Paul
>>
>> I have a rough mockup using SBL-1s, but I am building a Tayloe front 
>> end for a QRP rig. I could use that - it uses the data multiplexers 
>> which seem to be all the rage - FST3253
>> HF bands seem to be pretty dead here - we are at least 3000km from 
>> any civilization  in Western Australia. There is a lot of SE asian 
>> activity, but I suspect a lot of it is illegal as they dont conform 
>> to band plans. Occasional activity from eastern states but it is 
>> sporadic.
>> Probably 14MHz would be the best bet
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Giancarlo Moda | 2 Mar 01:06
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Re: Winrad V0.90

Hi,

FST switches have quite n interesting bandwidth but
switching does not permit to work at 144 or even worst
at 432MHz.

FST3253 maybe OK up to 30 MHz then they may have
internal unbalanced switching. You should see the
conversion loss will increase and also the noise.

FST3125 (3.3V) have been tested OK up to 50 MHz in the
I7SWX 2T H-Mode Mixer with up and down conversion.

73

Gian
I7SWX

--- Richard Hosking <richardh@...> wrote:

> Yes I dont know what the upper limit of those data
> swithches is, but it 
> sure wouldnt be 432 MHz. I will probably be looking
> at up 30 MHz max
> 
> Richard
> 
> m0eme Paul wrote:
> 
> > Thanks Richard I take it you are taking about HF
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richard | 2 Mar 07:07
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Re: Winrad V0.90

Giancarlo Moda wrote:
> Hi,
> 
> FST switches have quite n interesting bandwidth but
> switching does not permit to work at 144 or even worst
> at 432MHz.
> 
> FST3253 maybe OK up to 30 MHz then they may have
> internal unbalanced switching. You should see the
> conversion loss will increase and also the noise.
> 
> FST3125 (3.3V) have been tested OK up to 50 MHz in the
> I7SWX 2T H-Mode Mixer with up and down conversion.
> 
> 73
> 
> Gian
> I7SWX

Morning all,
Looks like I've managed to kill the pcm side on two sound cards using winrad.
Still gotta find out how.
Now I notice one of the clever Italians has managed to use the video input of an BT878
TV card for sampling, I did find his web site although the mods to the card were obvious , but alas 
not listed.
Anyone know more about this ?

I agree with you comments above Gian, you can I&Q demod easily up to 2.4 GHz , but the penalty is 
noise, the higher you go in frequency the wider the bandwidth used, WBCDMA is running at 4.7 Mchips/s.
Way beyond bouncing a signal off the moon , I would n't even take guess at path loss.
(Continue reading)

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Rein A. Smit | 3 Mar 01:34
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Re: [winrad] Re: Noise Reduction


  Alberto, Leif and Others,

Last night Roger, W3SZ placed some .wav files on his site at:

     http://home.comcast.net/~w3sz/index.html

and I was able to run them on Winrad with the delta44 card. at 96 kHz

The first time after all this time I listened to a signal at  96 kHz 
sampling
rate, because of  effective pass band in my receiver  frontends.
Always checked whether the card would sample at the different frequencies.
but always listened on 8 kHz

I was really surprised about the audio quality of the detected signals from
Roger's files.

Most likely, it is some oversight on my site, though I have been aware 
of Leif's comments
about the wideband requirements for Linrads noiseblanker to work to its 
fullest
capabilities.

So far I have always used linrad and winrad with output from a ssb 
receiver ( 1.8 kHZ
filter ) not realizing that this might not be the optimum conditions for 
the noise reducer
and noise blanking to perform..
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'Zaba' OH1ZAA | 3 Mar 01:50
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UKSMG (50 MHz) awareness for noise-canceling; Re: [linrad] Re: Winrad V0.90


Hello [linrad]-group!

Thanks to Leif and the alert users of Linrad the technology
is leaping forward. I am sure that there are still many not
so obvious improvements waiting to be discovered. I have put
some comments on the UKSMG-pages as 50 MHz is certainly one
of the bands to profit from this. Personally I have had much
trouble from outboard motors, pleasure yachts that will buzz
in my 50/144 main lobes for miles and miles during summertime
for hours on end... I noticed I have repeated myself in those
messages, but maybe it is good to stress the need for input
bandwidth regarding efficient operation of the main feature.

                                 73, "Zaba" OH1ZAA/2

P.S. Richard/G8JVM - I located the Spanish BT878A link:

http://www.domenech.org/bt878a-adc/index-decimator-e.htm

It goes up to 896 kilosamples/s (effectively 10-bits or more)

(recent) UKSMG announcements by OH1ZAA:

Linrad/Winrad: SM5BSZ/Leif has now markedly improved the Linrad Noise 
Blanker for the additional refined removal of weak man-made interference 
with the release of Linrad 2.02 (March 1st) 
[http://www.sm5bsz.com/linuxdsp/linroot.htm >> wlr2-02.zip] --- This 
version works flawlessly on Linux systems, but exhibits still occasional 
(rare) memory leakage problems in Windows. I noticed also incidental
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leif-NjylAwyOilXQT0dZR+AlfA@public.gmane.org | 3 Mar 15:39

Re: Noise Reduction

Hi Rein,

> So far I have always used linrad and winrad with output from a 
> ssb receiver ( 1.8 kHZ filter ) not realizing that this might 
> not be the optimum conditions for the noise reducer and noise 
> blanking to perform..

It depends. The Linrad blanker may work perfectly well if the
noise pulses are separated by more than 0.5 ms or so. (In contrast
to simple blankers that do not compensate for the phase response
of the SSB filter.)

The Linrad calibration procedure sets up a filter that corrects
for sub-optimal amplitude/phase response of an analog receiver.
Some pretty old info is available here:
http://www.sm5bsz.com/pcdsp/blnini.htm

With Linrad one can set the sampling speed at just about twice 
the upper audio frequency. For 300-2100 Hz, sample at 5kHz
(if your soundcard can go that low) The calibration routine
will make noise pulses extend one or two 2 samples, typically
5 times shorter than in the original audio.
(see http://www.sm5bsz.com/linuxdsp/pulresp/pulresp.htm )
Energy is conserved so the pulses also become much higher 
and easier to locate. Linrad will subtract the weak 
oscillations that belong to the short pulse. This is a 
linear operation that does not introduce intermodulation 
or loss of information.

The process works ONLY if the radio has adequate dynamic range
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Rein A. Smit | 3 Mar 21:02
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Re: Noise Reduction

Hi Leif,

Thanks for the message. I will have to go back to your documentation again
in order to ask you the right questions. In partcular how to determine 
whether
my front-end  the TS850 is a limiting factor in my environment or not.

My concern is not so much the blanking of pulses but the suppression of 
noise
I mean the blanking of pulses as in lightning, line noise and the like. 
As this is not
much of a problem here, I never paid much attention to that aspect of  
Linrad,
probably the real strong side of linrad.

It is really the rumbling noise what bothers all of us in the end.

I guess there is on the one hand the ability to do weak signal in a
highly polluted RF environment with strong undesired signals, possibly
overloading our receivers and on the other hand, the rumbling  noise
 that seems to be  inherent with the processing of  noise and what
prevents us from hearing the dots and dashes as dots and dashes.

Then there is also of course selectivity for desired sigals and birdies.

More to follow if I may.... .

73 Rein

leif@... wrote:
(Continue reading)

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