Hi Phil and all.  Someone may have already answered this, but if not,
WWV has two VLF stations, WWVB and WWVL.  I don't remember which is which,
but one is at 20KHZ and the other is at 60KHZ.

73 and 88 whare appropriate:
John

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John Jacques,  Amateur Radio Station KG7FA,
Apache Junction, Arizona
E-voice Mailbox number, 6717912