Re: [digitalradio] Re: Sound card question

[Patrick Lindecker]

Dave,

>   My sound card calibrates to 48009.37, which is .9998% fast
So the offset is +0.0195 %

>I transmit with an audio frequency of 2415 Hz
>I am therefore actually transmitting on 2439 Hz, or .9998% higher
No in TX it will be the reverse of RX. The true TX frequency will be equal 
to : 2415*(1+0.0195/100)=2145.47 Hz
Reversely, if you listen to a a 2145.47 Hz transmission, it will be appear 
for your program as a 2415 Hz transmission.

73
Patrick



- Original Message - 
From: "Dave 'Doc' Corio" <[EMAIL PROTECTED]>
To: 
Sent: Tuesday, October 07, 2008 11:28 PM
Subject: Re: [digitalradio] Re: Sound card question


>Thanks, Patrick!
>
>If I understand this, then, here is what I should expect:
>
>My sound card calibrates to 48009.37, which is .9998% fast
>I transmit with an audio frequency of 2415 Hz
>I am therefore actually transmitting on 2439 Hz, or .9998% higher
> than indicated
>
>Does that sound right?
>
> Tnx es 73
> Dave KB3MOW
>
>
> Patrick Lindecker wrote:
>>
>> Hello Dave,
>>
>> It is simple. If the offset in sampling frequency is x% and the true AF
>> frequency is f0, the displayed frequency f will be equal to
>> f=f0*(1-x/100)
>> Example: if the sampling offset is +1% and f0 is 1000 Hz, the frequency
>> displayed will be equal to 1000*(1-0.01)=990 Hz
>>
>> 73
>> Patrick
>>
>> - Original Message -
>> From: "Dave" <[EMAIL PROTECTED] >
>> To: > >
>> Sent: Tuesday, October 07, 2008 3:57 PM
>> Subject: [digitalradio] Re: Sound card question
>>
>> > Thanks, Simon! It makes sense that if the "native" speed is 48K, any
>> > other speed would require some type of "conversion".
>> >
>> > One more question, if I can impose on your good nature!
>> >
>> > What impact, if any, does the error in sampling rate have on any
>> > TX/RX offset? During the Tara Rumble I noticed that almost every
>> > station that responded to my CQ, came back a bit lower in frequency
>> > than mine. One station I responded to even told me I was off-
>> > frequency. I don't believe my IC-746 has any offset, and my RIT/XIT
>> > was off. Does that large error rate of 6984 ppm create an offset, and
>> > can I determine how great it is?
>> >
>> > Tnx es 73
>> > Dave KB3MOW
>> >
>> >
>> > --- In digitalradio@yahoogroups.com
>> , "Simon Brown \(KNS\)"
>> > <[EMAIL PROTECTED]> wrote:
>> >>
>> >> It means that the drivers are better - the internal clock runs at
>> > 48kHz,
>> >> other rates are created by either the driver or (very often)
>> > Windows.
>> >> Windows XP does not do a good job of this, VISTA however is
>> > excellent at
>> >> converting the sample rates.
>> >>
>> >> Simon Brown, HB9DRV
>> >> www.ham-radio-deluxe.com
>> >>
>> >> - Original Message -
>> >> From: "Dave 'Doc' Corio" <[EMAIL PROTECTED]>
>> >> > I've calibrated my sound card (Diamond PCI) two ways, using
>> > MMSSTV
>> >> > at 48000 Hz, and MMTTY at 11025 Hz. Here are the results of the
>> >> > calibration:
>> >> >
>> >> > MMSSTV 195 PPM 48009.37
>> >> >
>> >> > MMTTY 6984 PPM 11102
>> >> >
>> >>
>> >
>> >
>> >
>> > 
>> >
>> > Announce your digital presence via our Interactive Sked Page at
>> > http://www.obriensweb.com/sked 
>> >
>> > 30M digital activity at http://www.projectsandparts.com/30m
>> 
>> >
>> > Recommended software : DM780, Multipsk, FLDIGI, Winwarbler ,MMVARI.
>> > Yahoo! Groups Links
>> >
>> >
>> >
>> >
>> >
>>
>>
>
> 
>
> Announce your digital presence via our Interactive Sked Page at
> http://www.obriensweb.com/sked
>
> 30M digital activity at http://www.projectsandparts.com/30m
>
> Recommended software : DM780, Multipsk, FLDIGI, Winwarbler ,MMVARI.
> Yahoo! Groups Links
>
>
>
>
> 

Re: [digitalradio] Re: Sound card question

[Dave 'Doc' Corio]

Thanks, Patrick!

If I understand this, then, here is what I should expect:

My sound card calibrates to 48009.37, which is .9998% fast
I transmit with an audio frequency of 2415 Hz
I am therefore actually transmitting on 2439 Hz, or .9998% higher 
than indicated

Does that sound right?

Tnx es 73
Dave KB3MOW


Patrick Lindecker wrote:
>
> Hello Dave,
>
> It is simple. If the offset in sampling frequency is x% and the true AF
> frequency is f0, the displayed frequency f will be equal to
> f=f0*(1-x/100)
> Example: if the sampling offset is +1% and f0 is 1000 Hz, the frequency
> displayed will be equal to 1000*(1-0.01)=990 Hz
>
> 73
> Patrick
>
> - Original Message -
> From: "Dave" <[EMAIL PROTECTED] >
> To: mailto:digitalradio%40yahoogroups.com>>
> Sent: Tuesday, October 07, 2008 3:57 PM
> Subject: [digitalradio] Re: Sound card question
>
> > Thanks, Simon! It makes sense that if the "native" speed is 48K, any
> > other speed would require some type of "conversion".
> >
> > One more question, if I can impose on your good nature!
> >
> > What impact, if any, does the error in sampling rate have on any
> > TX/RX offset? During the Tara Rumble I noticed that almost every
> > station that responded to my CQ, came back a bit lower in frequency
> > than mine. One station I responded to even told me I was off-
> > frequency. I don't believe my IC-746 has any offset, and my RIT/XIT
> > was off. Does that large error rate of 6984 ppm create an offset, and
> > can I determine how great it is?
> >
> > Tnx es 73
> > Dave KB3MOW
> >
> >
> > --- In digitalradio@yahoogroups.com 
> , "Simon Brown \(KNS\)"
> > <[EMAIL PROTECTED]> wrote:
> >>
> >> It means that the drivers are better - the internal clock runs at
> > 48kHz,
> >> other rates are created by either the driver or (very often)
> > Windows.
> >> Windows XP does not do a good job of this, VISTA however is
> > excellent at
> >> converting the sample rates.
> >>
> >> Simon Brown, HB9DRV
> >> www.ham-radio-deluxe.com
> >>
> >> - Original Message -
> >> From: "Dave 'Doc' Corio" <[EMAIL PROTECTED]>
> >> > I've calibrated my sound card (Diamond PCI) two ways, using
> > MMSSTV
> >> > at 48000 Hz, and MMTTY at 11025 Hz. Here are the results of the
> >> > calibration:
> >> >
> >> > MMSSTV 195 PPM 48009.37
> >> >
> >> > MMTTY 6984 PPM 11102
> >> >
> >>
> >
> >
> >
> > 
> >
> > Announce your digital presence via our Interactive Sked Page at
> > http://www.obriensweb.com/sked 
> >
> > 30M digital activity at http://www.projectsandparts.com/30m 
> 
> >
> > Recommended software : DM780, Multipsk, FLDIGI, Winwarbler ,MMVARI.
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
>
>  

Re: [digitalradio] Re: Sound card question

[Patrick Lindecker]

Hello Dave,

It is simple. If the offset in sampling frequency is x% and the true AF 
frequency is f0, the displayed frequency f will be equal to
f=f0*(1-x/100)
Example: if the sampling offset is +1% and f0 is 1000 Hz, the frequency 
displayed will be equal to 1000*(1-0.01)=990 Hz

73
Patrick

- Original Message - 
From: "Dave" <[EMAIL PROTECTED]>
To: 
Sent: Tuesday, October 07, 2008 3:57 PM
Subject: [digitalradio] Re: Sound card question


> Thanks, Simon! It makes sense that if the "native" speed is 48K, any
> other speed would require some type of "conversion".
>
> One more question, if I can impose on your good nature!
>
> What impact, if any, does the error in sampling rate have on any
> TX/RX offset? During the Tara Rumble I noticed that almost every
> station that responded to my CQ, came back a bit lower in frequency
> than mine. One station I responded to even told me I was off-
> frequency. I don't believe my IC-746 has any offset, and my RIT/XIT
> was off. Does that large error rate of 6984 ppm create an offset, and
> can I determine how great it is?
>
> Tnx es 73
> Dave KB3MOW
>
>
> --- In digitalradio@yahoogroups.com, "Simon Brown \(KNS\)"
> <[EMAIL PROTECTED]> wrote:
>>
>> It means that the drivers are better - the internal clock runs at
> 48kHz,
>> other rates are created by either the driver or (very often)
> Windows.
>> Windows XP does not do a good job of this, VISTA however is
> excellent at
>> converting the sample rates.
>>
>> Simon Brown, HB9DRV
>> www.ham-radio-deluxe.com
>>
>> - Original Message - 
>> From: "Dave 'Doc' Corio" <[EMAIL PROTECTED]>
>> >I've calibrated my sound card (Diamond PCI) two ways, using
> MMSSTV
>> > at 48000 Hz, and MMTTY at 11025 Hz. Here are the results of the
>> > calibration:
>> >
>> >MMSSTV 195 PPM 48009.37
>> >
>> >MMTTY 6984 PPM 11102
>> >
>>
>
>
>
> 
>
> Announce your digital presence via our Interactive Sked Page at
> http://www.obriensweb.com/sked
>
> 30M digital activity at http://www.projectsandparts.com/30m
>
> Recommended software : DM780, Multipsk, FLDIGI, Winwarbler ,MMVARI.
> Yahoo! Groups Links
>
>
>
>
> 

Re: [digitalradio] Re: Sound card question

[Simon Brown (KNS)]

A significant difference between TX and RX can result in an offset. During 
my holidays in Oct / Nov I will add full soundcard calibration for all modes 
in DM780.

Simon Brown, HB9DRV
www.ham-radio-deluxe.com

- Original Message - 
From: "Dave" <[EMAIL PROTECTED]>
>
> What impact, if any, does the error in sampling rate have on any
> TX/RX offset? During the Tara Rumble I noticed that almost every
> station that responded to my CQ, came back a bit lower in frequency
> than mine. One station I responded to even told me I was off-
> frequency. I don't believe my IC-746 has any offset, and my RIT/XIT
> was off. Does that large error rate of 6984 ppm create an offset, and
> can I determine how great it is?
> 

[digitalradio] Re: Sound card question

[Dave]

Thanks, Simon! It makes sense that if the "native" speed is 48K, any 
other speed would require some type of "conversion".

One more question, if I can impose on your good nature!

What impact, if any, does the error in sampling rate have on any 
TX/RX offset? During the Tara Rumble I noticed that almost every 
station that responded to my CQ, came back a bit lower in frequency 
than mine. One station I responded to even told me I was off-
frequency. I don't believe my IC-746 has any offset, and my RIT/XIT 
was off. Does that large error rate of 6984 ppm create an offset, and 
can I determine how great it is?

Tnx es 73
Dave KB3MOW


--- In digitalradio@yahoogroups.com, "Simon Brown \(KNS\)" 
<[EMAIL PROTECTED]> wrote:
>
> It means that the drivers are better - the internal clock runs at 
48kHz, 
> other rates are created by either the driver or (very often) 
Windows. 
> Windows XP does not do a good job of this, VISTA however is 
excellent at 
> converting the sample rates.
> 
> Simon Brown, HB9DRV
> www.ham-radio-deluxe.com
> 
> - Original Message - 
> From: "Dave 'Doc' Corio" <[EMAIL PROTECTED]>
> >I've calibrated my sound card (Diamond PCI) two ways, using 
MMSSTV
> > at 48000 Hz, and MMTTY at 11025 Hz. Here are the results of the
> > calibration:
> >
> >MMSSTV 195 PPM 48009.37
> >
> >MMTTY 6984 PPM 11102
> >
>

Re: [digitalradio] Sound card question

[Simon Brown (KNS)]

It means that the drivers are better - the internal clock runs at 48kHz, 
other rates are created by either the driver or (very often) Windows. 
Windows XP does not do a good job of this, VISTA however is excellent at 
converting the sample rates.

Simon Brown, HB9DRV
www.ham-radio-deluxe.com

- Original Message - 
From: "Dave 'Doc' Corio" <[EMAIL PROTECTED]>
>I've calibrated my sound card (Diamond PCI) two ways, using MMSSTV
> at 48000 Hz, and MMTTY at 11025 Hz. Here are the results of the
> calibration:
>
>MMSSTV 195 PPM 48009.37
>
>MMTTY 6984 PPM 11102
> 

Re: [digitalradio] EA3AQS CQing MT63

[Abelard Encabo]

- Missatge Original -
De: Andrew O'Brien <[EMAIL PROTECTED]>
Data: Dimarts, Octubre 7, 2008 2:21 am
Assumpte: Re: [digitalradio] EA3AQS CQing MT63
Destinatari: digitalradio@yahoogroups.com

 Andrew, I use Mixw 2.18 program for data modes . About MT63 never
 have got troubles in TX/RX. Time ago I worked with IZ8BLY´s and
 HERE I had problems with interleave and slanting.
 I use 1.000 long interleave but I can change other settings (Mixw)
 See you on the air. 73
 Abel - EA3AQS
 

> I was using DM780.  I should have decoded who ever it was, was a good
> signal.  Perhaps I needed to toggle between short or long interleave.
> 
> 
> 
> On Mon, Oct 6, 2008 at 8:07 PM, Tony <[EMAIL PROTECTED]> wrote:
> > Andy,
> >
> >> I saw a 1000 wide MT63 sigal, alas no decode.
> >
> > Must have been Abel (EA3AQS). He was calling for a while. Were 
> you using
> > IZ8BLY's MT63 Terminal?
> >
> > Tony, K2MO
> >
> > - Original Message -
> > From: "Andrew O'Brien" <[EMAIL PROTECTED]>
> > To: 
> > Sent: Monday, October 06, 2008 7:52 PM
> > Subject: Re: [digitalradio] EA3AQS CQing MT63
> >
> > I saw a 1000 wide MT63 sigal, alas no decode.
> 

[digitalradio] Sound card question

[Dave 'Doc' Corio]

Here's a goody for someone knowledgeable about sound cards.

I've calibrated my sound card (Diamond PCI) two ways, using MMSSTV 
at 48000 Hz, and MMTTY at 11025 Hz. Here are the results of the 
calibration:

MMSSTV 195 PPM 48009.37

MMTTY 6984 PPM 11102

This seems to be a huge discrepancy, but that's where I start 
getting confused. Does this simply mean the card works better at 48 Khz? 
It is rated at 16 Bit, 48 Khz record and playback.

These calibrations have been done multiple times over the past week 
and are consistent every time calibration is run.

Thanks for any input
73 Dave KB3MOW

[digitalradio] New file uploaded to digitalradio

[digitalradio]

Hello,

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  Uploaded by : kt2q <[EMAIL PROTECTED]> 
  Description : MT63 reception with QRM (Video) 

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