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Radio WWV/H Audio Demodulator/Decoder - doc.ntp.org
http://doc.ntp.org/archives/drivers/driver36/
The audio gain shows the current codec gain setting in the range 0 to 255. Ordinarily, the receiver audio gain control should be set for a value midway in this range. ident: Station identifier: WV_f_ for WWV WH_f_ for WWVH frequency f being tracked If neither station is heard on any frequency, the reference identifier shows NONE. metric
ConfiguringAudioRefclocks < Support < NTP
https://support.ntp.org/bin/view/Support/ConfiguringAudioRefclocks
Plug your stuff together and use your mixer/aumix software to enable the sound "record" function, and see if you can hear anything. You must be able to get record/input working before trying ntpd refclocks. Once you have your audio hardware tested and cabled up, you can try playing with the ntpd audio refclocks.
Reference Clock Audio Drivers - doc.ntp.org
https://doc.ntp.org/archives/4.1.1/audio/
The WWV/H and CHU audio drivers require an external shortwave radio with the radio output - speaker or headphone jack - connected to either the microphone or line-in port on the computer. There is some degree of art in setting up the radio and antenna and getting the setup to work.
A Precision Radio Clock for WWV Transmissions - doc.ntp.org
http://doc.ntp.org/reflib/reports/wwv/wwv.pdf
voice announcements and audio tones at 440, 500 and 600 Hz. In addition, the stations transmit a time-of-century digital timecode designed for displays and other electronic media. Only the time-code and related pulses at 100, 1000 and 1200 Hz are used by the DSP clock. The WWV signal format is described in [5].
Radio WWV/H Audio Demodulator/Decoder
http://library.mobrien.com/Manuals/ntp/driver36.htm
The audio gain shows the current codec gain setting in the range 0 to 255. Ordinarily, the receiver audio gain control or IRIG level control should be set for a value midway in this range. ident The station identifier shows the station, C for WWV or H for WWVH, and frequency being tracked.
NTP Reference Clocks Using FreeBSD 7.0
https://dx.eng.uiowa.edu/dave/ntptext.php
I've included the relevant lines from my ntp.conf file here. # wwv/h audio refclock server 127.127.36.0 noselect fudge 127.127.36.0 time1 0.0 time2 0.0 flag2 1 flag4 1 # flag2 mic=0,line in=1 Note that the time1 and time2 parameters should be changed to reflect the propagation delays associated with your own location. time1 is the average delay ...
Radio WWV/H Audio Demodulator/Decoder
http://web.mit.edu/freebsd/head/contrib/ntp/html/drivers/driver36.html
Synopsis Address: 127.127.36.u Reference ID: WVf or WHf Driver ID: WWV_AUDIO Autotune Port: /dev/icom; 1200/9600 baud, 8-bits, no parity Audio Device: /dev/audio and /dev/audioctl Description This driver synchronizes the computer time using data encoded in shortwave radio transmissions from NIST time/frequency stations WWV in Ft. Collins, CO, and WWVH in Kauai, HI.
WWV Simulator
WWV Simulator. This site attempts to simulate the audio portion of stations WWV and WWVH. It should sound much like what you’d hear if you tuned in a shortwave radio to one of these stations. Each station has its own style of tones and voice time announcements. Station identification is …
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