126  * WWV/H format (100-Hz, 9 digits, 1 m frame)
193  * IRIG format except first frame (1000 Hz, 20 digits, 1 s frame)
209  * IRIG format first frame (1000 Hz, 20 digits, 1 s frame)
239 int	tone = 1000;		/* WWV sync frequency */
365 		delay(SECOND - tv.tv_usec * 8 / 1000);  in main()
457 		 * percent on the 1000-Hz carrier.  in main()
472 						peep(M5, 1000, HIGH);  in main()
473 						peep(M5, 1000, LOW);  in main()
476 						peep(M2, 1000, HIGH);  in main()
477 						peep(M8, 1000, LOW);  in main()
485 					peep(arg, 1000, HIGH);  in main()
486 					peep(10 - arg, 1000, LOW);  in main()
490 					peep(arg, 1000, HIGH);  in main()
491 					peep(10 - arg, 1000, LOW);  in main()
503 		 * modulateod pulses 200, 500 and 800 ms at 100-Hz.  in main()
542 				peep(1000 - arg, tone, OFF);  in main()
581 	 * The WWV data pulse begins with 5 ms of 1000 Hz follwed by a  in sec()
583 	 * 100 Hz corresponding to 0, 1 or position indicator (PI),  in sec()
584 	 * respectively. Note the 100-Hz data pulses are transmitted 6  in sec()
585 	 * dB below the 1000-Hz sync pulses. Originally the data pulses  in sec()
587 	 * engineers increased that to 6 dB because the Heath GC-1000  in sec()
593 	peep(1000 - code, 100, OFF);  in sec()
598  * Generate cycles of 100 Hz or any multiple of 100 Hz.
602 	int	freq,		/* frequency (Hz) */  in peep()