_____ f. Using your rig’s calibration procedure, adjust your rig’s calibration so the Fldigi frequency at the bottom of the screen is as close as possible to the WWV frequency. In that spirit, WW0WWV is sponsoring frequency measurement as part of its activities. You won't be able to get more accurate than that. WWV transmitts on known frequencies 5, 10 & 15 MHz. You can zero beat your signal generator to these frequencies. As you might guess, if you set the LO near (but not exactly on) the WWV frequency and to to WWV the calibration is midway between that of the previous two calibrations. The white line on the waterfall will be centered very close to 600 Hz. The ability to use transfer standards is a tremendous advantage. The only inexpensive alternative is to calibrate the timebase using the time signals transmitted by radio stations WWV and WWVH.

Most crystal oscillators are reasonably stable if kept at a constant … WWV is the US broadcast center of frequency distribution and measurement. NIST radio stations WWV, WWVH, and WWVB, and radionavigation signals from LORAN-C and GPS. The station radiates 10 000 W on 5 MHz, 10 MHz, and 15 MHz; and 2500 W on 2.5 MHz and 20 MHz. If you set the LO 4 MHz higher than WWV and tune to WWV (far left of display) you get a completely different calibration from setting the LO 4 MHz lower than WWV and tuning to it (far right of display). Each frequency is broadcast from a separate transmitter.

calibration equipment. That's especially true if you want the calibration to be trace- able to the NBS (National Bureau of Stan- dards). FREQUENCY CALLIBRATION USING HF WWV 8/11/2007 W4CWG INTRODUCTION If you've always wanted a stable, accurate, inexpensive reference frequency source good for most amateur and experimental needs but not the size, cost, and complexity of one of the more sophisticated standards then this may be your answer.
It allows traceable calibrations to be made simultaneously at a number of sites as long as each site. WWV operates in the high frequency (HF) portion of the radio spectrum.

Using RTL-SDR … Note: you will not be able to calibrate to the exact frequency of WWV… Each signal delivers NIST traceability at a known level of uncertainty. Frequency Calibration and Certificates. You don't need a frequency counter while you do this because WWV is accurate. These signals will be accurate.

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