Re: [digitalradio] Re: Soundcard Calibration

2007-09-12 Thread [EMAIL PROTECTED] 
Simon Brown wrote:
> Doesn't this assume an accurate system clock? I think I see a class in gMFSK 
> / fldidgi to compare input <=> output but for calibration we need an 
> accurate source.
>   
I use Dimension-4 to keep my PC clock on time, but there are other 
similar programs about.

I suspect that you could either advise people to install such systems, 
or embed one in your application?

Dave (G0DJA)

[digitalradio] Re: Soundcard Calibration

2007-09-12 Thread jeffnjr484 
Hello Vojtech and Simon,

Im very interested in finding away to calibrate my soundcard to
something easier then wwv. MT63 is a hard program to setup.
jeff






-- In digitalradio@yahoogroups.com, "Patrick Lindecker" <[EMAIL PROTECTED]> 
wrote:
>
> Hello Vojtech and Simon,
> 
> >suppose he measures with the system clock how long it takes to feed
> >some extended number of sound bits through the system.
> Yes I confirm. I do this way. The computer clock precision is widely
sufficient.
> 
> 73
> Patrick
> 
> 
>   - Original Message - 
>   From: Vojtech Bubnik 
>   To: digitalradio@yahoogroups.com 
>   Sent: Wednesday, September 12, 2007 9:50 AM
>   Subject: [digitalradio] Re: Soundcard Calibration
> 
> 
>   --- In digitalradio@yahoogroups.com, "Simon Brown" 
>   wrote:
>   >
>   > Somewhere I saw a solution for calibrating a soundcard (not using
>   WWV). Can anyone help with this please - I want to write a DD to do
>   this then add the code to a program of mine.
>   > 
>   > Why? Because I'm thinking about MT63 - looks interesting but the
>   soundcard accuracy is important.
>   > 
>   > Simon Brown, HB9DRV
>   >
> 
>   I think Patrick in his MultiPSK has some form of auto calibration. I
>   suppose he measures with the system clock how long it takes to feed
>   some extended number of sound bits through the system.
> 
>   To implement it is on my list for PocketDigi too.
> 
>   73, Vojtech OK1IAK
>

Re: [digitalradio] Re: Soundcard Calibration

2007-09-12 Thread Patrick Lindecker 
Hello Vojtech and Simon,

>suppose he measures with the system clock how long it takes to feed
>some extended number of sound bits through the system.
Yes I confirm. I do this way. The computer clock precision is widely sufficient.

73
Patrick


  - Original Message - 
  From: Vojtech Bubnik 
  To: digitalradio@yahoogroups.com 
  Sent: Wednesday, September 12, 2007 9:50 AM
  Subject: [digitalradio] Re: Soundcard Calibration


  --- In digitalradio@yahoogroups.com, "Simon Brown" <[EMAIL PROTECTED]>
  wrote:
  >
  > Somewhere I saw a solution for calibrating a soundcard (not using
  WWV). Can anyone help with this please - I want to write a DD to do
  this then add the code to a program of mine.
  > 
  > Why? Because I'm thinking about MT63 - looks interesting but the
  soundcard accuracy is important.
  > 
  > Simon Brown, HB9DRV
  >

  I think Patrick in his MultiPSK has some form of auto calibration. I
  suppose he measures with the system clock how long it takes to feed
  some extended number of sound bits through the system.

  To implement it is on my list for PocketDigi too.

  73, Vojtech OK1IAK

[digitalradio] Re: Soundcard Calibration

2007-09-12 Thread Vojtech Bubnik 
> Doesn't this assume an accurate system clock? I think I see a class
in gMFSK 
> / fldidgi to compare input <=> output but for calibration we need an 
> accurate source.

If your system time is 1 second off every day, system clock precision
is 1 / (24*60*60) = 12 ppm. My feeling is that this is good enough.

73, Vojtech OK1IAK

Re: [digitalradio] Re: Soundcard Calibration

2007-09-12 Thread Simon Brown 
Doesn't this assume an accurate system clock? I think I see a class in gMFSK 
/ fldidgi to compare input <=> output but for calibration we need an 
accurate source.

Simon Brown, HB9DRV

- Original Message - 
From: "Vojtech Bubnik" <[EMAIL PROTECTED]>
>
> I think Patrick in his MultiPSK has some form of auto calibration. I
> suppose he measures with the system clock how long it takes to feed
> some extended number of sound bits through the system.
>
> To implement it is on my list for PocketDigi too.
>

[digitalradio] Re: Soundcard Calibration

2007-09-12 Thread Vojtech Bubnik 
--- In digitalradio@yahoogroups.com, "Simon Brown" <[EMAIL PROTECTED]>
wrote:
>
> Somewhere I saw a solution for calibrating a soundcard (not using
WWV). Can anyone help with this please - I want to write a DD to do
this then add the code to a program of mine.
> 
> Why? Because I'm thinking about MT63 - looks interesting but the
soundcard accuracy is important.
> 
> Simon Brown, HB9DRV
>

I think Patrick in his MultiPSK has some form of auto calibration. I
suppose he measures with the system clock how long it takes to feed
some extended number of sound bits through the system.

To implement it is on my list for PocketDigi too.

73, Vojtech OK1IAK