[Elecraft] OT: K3 timekeeping

[sancho]

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.harris at 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
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