Re: [multipsk] Re: 16bit Button


Aug 7, 2007

 


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#3617 Aug 7, 2007

What exactly does the 16 bit button do? I'm runing Multipsk on a late

model Centrino M 1.86Ghz laptop, and all it works well. I noticed that

when I press the 16 bit buttom, the noise level on the waterfall goes

up. Any help is greatly appreciated.



73... Jon W1MNK



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#3621 Aug 8, 2007

The 16-bit button allows you to sample at a 16-bit depth as opposed to the 8-bit default. Don't know if it makes any difference or not; something to experiment with.

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#3622 Aug 8, 2007

Daryl, one thing I noticed is that 16-bits causes more "snow" or noiseon the waterfall.



73... Jon W1MNK



Daryl Young wrote:The 16-bit button allows you to sample at a 16-bit depthas opposed to the 8-bit default. Don't know if it makes any differenceor not; something to experiment with.



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#3628 Aug 12, 2007

--- In multipsk@yahoogroups.com, Jon Maguire w1mnk@...> wrote: >

> What exactly does the 16 bit button do? I'm runing Multipsk on a late

> model Centrino M 1.86Ghz laptop, and all it works well. I noticed

that > when I press the 16 bit buttom, the noise level on the waterfall goes

> up. Any help is greatly appreciated.

>

> 73... Jon W1MNK

>



Hey Jon!!



I just read the PDF pesentation file on MultiPSK and it says that the

16-bit button increases the sensitivity of the decoder; that's why the

noise level went up on the waterfall.



Best 73's,

Daryl



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#3629 Aug 12, 2007

--- In multipsk@yahoogroups.com, "darylyng" darylyng@...> wrote: >

> --- In multipsk@yahoogroups.com, Jon Maguire w1mnk@> wrote:

> >

> > What exactly does the 16 bit button do? I'm runing Multipsk on a

late > > model Centrino M 1.86Ghz laptop, and all it works well. I noticed

> that

> > when I press the 16 bit buttom, the noise level on the waterfall

goes > > up. Any help is greatly appreciated.

> >

> > 73... Jon W1MNK

> >

>

> Hey Jon!!

>

> I just read the PDF pesentation file on MultiPSK and it says that

the > 16-bit button increases the sensitivity of the decoder; that's why

the > noise level went up on the waterfall.

>

> Best 73's,

> Daryl

>

Addenum:



I would use MultiPSK in 16-bit mode for the best decoding quality,

especially with weak signals.



Daryl



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#3637 Aug 20, 2007

Hello to all, The 16 bit button allows the decoding with 16 bitssamples instead of 8 bits samples (so the definition in the waterfall isbetter). If the level is correct (let's say 30 to 60 %) the decoding gain mustbe very weak (fraction of 0.1 dB ?) and it can be put or not. As it takes more CPU and is a bit less robust (because it must be definedwhat are the low and the high bytes), it can be off. However if the level is very low (1% for example)for any reason, it permits to decode very weak signals (I don't mean very lowS/N signal but an input signal with very low amplitude). 73Patrick ----- Original Message -----From:darylyngTo: multipsk@yahoogroups.comSent: Monday, August 13, 2007 12:16AMSubject: [multipsk] Re: 16bitButton

--- In multipsk@yahoogroup s.com,"darylyng" darylyng@.. .> wrote:>> --- In multipsk@yahoogroup s.com, JonMaguire w1mnk@> wrote:> >> > What exactly does the16 bit button do? I'm runing Multipsk on a late > > modelCentrino M 1.86Ghz laptop, and all it works well. I noticed > that

> > when I press the 16 bit buttom, the noise level on the waterfall

goes > > up. Any help is greatly appreciated.> >

> > 73... Jon W1MNK> >> > Hey Jon!!>

> I just read the PDF pesentation file on MultiPSK and it says that

the > 16-bit button increases the sensitivity of the decoder;that's why the > noise level went up on the waterfall. >

> Best 73's,> Daryl>Addenum:

I would useMultiPSK in 16-bit mode for the best decoding quality, especially withweaksignals.

Daryl


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