But.. It is not WWV that the "atomic" clocks and watches sync to, it is WWVB:
http://www.nist.gov/pml/div688/grp40/wwvb.cfm Somewhat different specs and certainly different than the voice and tone WWVB broadcasts. Jack Sent from my iPad > On Nov 27, 2014, at 17:04, Mike Harris <mike.har...@horizon.co.fk> wrote: > > Extract from NIST Time and Frequency Services publication 432 (2002) > > The WWV transmitters consist of two types: plate modulated class C > transmitters operating at 10 kW each on 5, 10 and 15 MHz, and class A > transmitters operating at 2.5 kW each on 2.5 and 20 MHz. > > Regards, > > Mike VP8NO > >> On 27/11/2014 16:22, Phil Kane wrote: >>> On 11/26/2014 10:11 PM, Jim Brown wrote: >>>> On Wed,11/26/2014 4:54 PM, Fred Jensen wrote: >>>> The second and third harmonics of the tones, maybe the fourth harmonic >>>> depending on conditions and strength of the signal at your QTH >> >> Another thing that should have been mentioned as appearing in the >> baseband are the "ticks". >>> >>> How far down were the harmonics? -40 is 1% distortion, -50 is 0.32%. 5% >>> is widely considered to be "communications quality." >>> >>> When I've listened to WWV (not often), I hear distortion. They're a >>> Standard for Frequency and Time, not high futility. :) >> >> How much of that is due to selective fading (twist) of the sidebands? >> It's HF, you know! :) >> >> 73 de K2ASP - Phil Kane >> Elecraft K2/100 s/n 5402 > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to san...@frawg.org ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
