[ntp:questions] Re: WWV audio driver, FreeBSD, Can't seem to get it going

David L. Mills mills at udel.edu
Fri May 20 19:14:33 UTC 2005


Roger,

You've turned on the sidetone. Does it sound okay? Note the AC97 link 
rate. Is that the sample rate? The codec sample rate should be 8000 Hz.

Dave


wa6zvp at gmail.com wrote:
> Folks,
>  I suspect that interest in drivers other than GPS and PPS are waning,
> in fact I have 3 GPS based servers as well, but thought I'd try
> something else.
> 
> I have a Traconex 1020 WWV receiver used with driver 3 which works
> rather well, so I thought I would add the audio driver (36) to the mix.
> 
> System is an older Dell workstation with FreeBSD 5.3.  The NTP version
> is 4.2.0a-20050303, although I've tried others, and even BSD 5.4
> The sound 'card' is on the motherboard.
> 
> I did:
> kldload snd_driver
> which resulted in:
> May 19 19:57:01 Fuzzball kernel: pcm0: <Intel ICH2 (82801BA)> port
> 0xdc40-0xdc7f,0xd800-0xd8ff irq 10 at device 31.5 on pci0
> May 19 19:57:01 Fuzzball kernel: pcm0: <Analog Devices AD1885 AC97
> Codec>
> May 19 19:57:01 Fuzzball kernel: pcm0: measured ac97 link rate at 55945
> Hz
> May 19 20:08:03 Fuzzball ntpd[970]: ntpd 4.2.0a at 1.1191-r Wed May 18
> 20:59:11 PM
> 
> and it created /dev/audio0.0 to which I symlinked ntp.audio.0
> 
> ntp.conf contains:
> server 127.127.36.0
> fudge 127.127.36.0 flag2 1 flag3 1 flag4 1
> 
> Here is the last 3 samples from clockstats:
> 
> 53510 59149.914 127.127.36.0 wwv8 2  91 WV15 0   226  10.1 62698  4880
> 62698
> 53510 59149.914 127.127.36.0 wwv8 2  91 WH15 0   248  12.5 443431  4880
> 443431
> 53510 59208.430 127.127.36.0 wwv8 2 111 WV15 0   361  13.2 24318  2480
> 24318
> 53510 59208.430 127.127.36.0 wwv8 2 111 WH15 0   264  15.7 35736  2480
> 35736
> 53510 59266.946 127.127.36.0 wwv8 2  91 WV15 0   298   9.5 28666    80
> 28666
> 53510 59266.946 127.127.36.0 wwv8 2  91 WH15 0   254  12.0 239884    80
> 239884
> 
> The AGC does show action and responds to removing/inserting audio.
> However, the tone filters never seem to get a grasp on things, like
> perhaps the output of the A/D is garbage?
> 
> I know that Dave Mills has said that this driver is no longer
> maintainable, at least by him, but I found references from last year
> that it did work under FreeBSD.
> 
> Does anyone have any ideas on where I should go from here?
> 
>         Roger
> 



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