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13 <!-- #BeginDate format:En2m -->17-Jul-2014 02:17<!-- #EndDate -->
18 Reference ID: <tt>CHU</tt><br>
19 Driver ID: <tt>CHU</tt><br>
20 Modem Port: <tt>/dev/chu<i>u</i></tt>; 300 baud, 8-bits, no parity<br>
21 Autotune Port: <tt>/dev/icom</tt>; 1200/9600 baud, 8-bits, no parity<br>
22 Audio Device: <tt>/dev/audio</tt> and <tt>/dev/audioctl</tt>
25 …from Canadian time/frequency station <a href="http://inms-ienm.nrc-cnrc.gc.ca/time_services/shortw…
31 …-compatible, 300-b/s modem or modem chip, as described on the <a href="../pps.html">Pulse-per-seco…
32 …d ray geometry. In Newark DE, 625 km from the transmitter, the predicted one-hop propagation delay…
33 …r, the mean offset with a 2.4-GHz P4 running FreeBSD 6.1 is generally within 0.2 ms short-term wit…
37 …-kHz μ-law companded codec samples using maximum-likelihood techniques which exploit the consid…
38 …-ienm.nrc-cnrc.gc.ca/time_services/chu_e.html">CHU website</a>. A timecode is assembled when all b…
40 …-likelihood UART, burst assembler and majority decoder. The DSP modem demodulates Bell 103 modem a…
41 …-stage shift registers, one for each of eight phases of the 300-b/s bit clock. At each phase a new…
42 …-robin order as the phases of each bit arrive. At the end of each bit all eight phases are searche…
43 <p>The burst assembler processes characters either from the maximum-likelihood UART or directly fro…
44 …-character blocks, each block representing ten 4-bit BCD digits. The format B blocks sent in secon…
45 …B burst the second block is bit-inverted relative to the first, so a perfect burst of five 8-bit c…
47 …-bit code combination that might be decoded at that position. In order to use the character timest…
49 … is the distance for that position and the corresponding code is the maximum-likelihood digit. If …
50 <p>The result of the majority decoder is a nine-digit timecode representing the maximum-likelihood …
51 …face can handle is 60. These are processed using a median filter and trimmed-mean average, so the …
53 …-V standard, which is a bidirectional serial bus operating at TTL levels. The bus can be connected…
54 …tt>/dev/icom</tt> and, if successful will tune the radio to 3.331 MHz. The 1-kHz offset is useful …
55 …bursts are received from one or more stations, the driver operates in a five-minute cycle. During …
57 …tt>ntpq</tt> program and the <tt>clockvar</tt> command. This displays the last determined timecode…
58 … single message beginning with <tt>chuB</tt> is produced for each format B burst received in secon…
59 <p><tt>stat sig n b</tt></p>
60 …tt>stat</tt> is the status code, <tt>sig</tt> the character span, <tt>n</tt> the number of charact…
61 …-V interface for ICOM radios is active, a debug level greater than 1 will produce a trace of the C…
63 When enabled by the <tt>filegen</tt> facility, every received timecode is written to the <tt>clocks…
78 agc audio gain (0-255)
83 …tt>year</tt> and extending through <tt>dut</tt> are decoded from the received data and are in fixe…
85 <dt><tt>s</tt></dt>
86 …<dd>The sync indicator is initially <tt>?</tt> before the clock is set, but turns to space when th…
87 <dt><tt>q</tt></dt>
88 …<dd>The quality character is a four-bit hexadecimal code showing which alarms have been raised dur…
90 <dt><tt>8</tt></dt>
92 <dt><tt>4</tt></dt>
94 <dt><tt>2</tt></dt>
96 <dt><tt>1</tt></dt>
100 <dt><tt>yyyy ddd hh:mm:ss</tt></dt>
102 <dt><tt>lw</tt></dt>
103 …<dd>The leap second warning is normally space, but changes to <tt>L</tt> if a leap second is to oc…
104 <dt><tt>dst</tt></dt>
106 <dt><tt>dut</tt></dt>
108 <dt><tt>lset</tt></dt>
110 <dt><tt>agc</tt></dt>
112 <dt><tt>ident</tt></dt>
113 <dd>The CHU identifier <tt>CHU </tt>followed by the current radio frequency
114 code, if the CI-V interface is active, or <tt>CHU</tt> if not. The radio
117 <dt><tt>dist</tt></dt>
119 <dt><tt>tsmp</tt></dt>
124 <dt><tt>time1 <i>time</i></tt></dt>
126 <dt><tt>time2 <i>time</i></tt></dt>
128 <dt><tt>stratum <i>number</i></tt></dt>
130 <dt><tt>refid <i>string</i></tt></dt>
131 … reference identifier, an ASCII string from one to four characters, with default <tt>CHU</tt>.</dd>
132 <dt><tt>flag1 0 | 1</tt></dt>
134 <dt><tt>flag2 0 | 1</tt></dt>
135 …s the audio input port, where 0 is the mike port (default) and 1 is the line-in port. It does not …
136 <dt><tt>flag3 0 | 1</tt></dt>
138 <dt><tt>flag4 0 | 1</tt></dt>
139 <dd>Enable verbose <tt>clockstats</tt> recording if set.</dd>