[NLRS] Link -- New phase-modulation WWVB signal

[S. Earl Jarosh]

My cheap 7 year old 20.00 SkyScan Sam's special is still connected in my
lower level on an inside wall.


S. Earl Jarosh, N0HZ
Cell:  612.868.1313
Off:   763.545.3275
Home:  763.546.7897
Fax:   763.546.7897
earl at moneycenters.com

 
-----Original Message-----
From: nlrs-bounces at mailman.qth.net [mailto:nlrs-bounces at mailman.qth.net] On
Behalf Of tosca005 at umn.edu
Sent: Tuesday, March 12, 2013 9:31 PM
To: Donn, WA2VOI
Cc: nlrs at mailman.qth.net; geraldj at netins.net
Subject: Re: [NLRS] Link -- New phase-modulation WWVB signal



Did they start testing this new modulation method already?

Maybe it's just coincidence, but my wristwatch with a WWVB receiver has
failed to connect to their transmitter since 03/07/13 after 5-7 years of
regular operation. Naturally, they say that the new modulation will not
impair the function of existing equipment, but how certain is that?

Or maybe it's just time to buy a new watch.

W0JT/5

On Mar 12 2013, Donn, WA2VOI wrote:

>
>
>According to the NIST web pages, they're a little better than that, 
>though they do acknowledge the difficuties of 60KHz work.
>:-)
>
>"The antennas are spaced 857 m apart. Each antenna is a top loaded 
>monopole consisting of four 122-m towers arranged in a diamond shape.  
>A system of cables, often called a capacitance hat or top hat, is 
>suspended between the four towers. This top hat is electrically 
>isolated from the towers, and is electrically connected to a downlead 
>suspended from the center of the top hat.
>The downlead serves as the radiating element.
>
>As the length of a vertical radiator becomes shorter compared to 
>wavelength, the efficiency of the antenna goes down. In other words, it 
>requires more and more transmitter power to increase the effective 
>radiated power. The north antenna system at WWVB has an efficiency of 
>about 50.6%, and the south antenna has an efficiency of about 57.5%. 
>However, the combined efficiency of the two antennas is about 65%. As a 
>result, each transmitter only has to produce a forward power of about 
>54 kW for WWVB to produce its effective radiated power of 70 kW."
>
>Basic clock is  <1x10-12.  Compensating for path delay allows UTC to 
><100usec.  Not too bad, actually, for consumer use (i.e., $20 clocks).
>
>73 Donn
>WA2VOI/0
>
>
>
>
>----- Original Message -----
>From: "Dr. Gerald N. Johnson" <geraldj at netins.net>
>To: <nlrs at mailman.qth.net>
>Sent: Wednesday, March 13, 2013 12:30 AM
>Subject: Re: [NLRS] Link -- New phase-modulation WWVB signal
>
>
>>
>>
>> I think they are running 5 KW from a 10 KW transmitter turned down to 
>> get long tube life.
>>
>> Their limit and ours is antenna. Wavelength is about 4 miles. 
>> Hard to build an effective antenna though the 15 mile dipole for 15 
>> GHz at Jim Creek Washington has been working a long time. I think the 
>> WWVB antenna is a wire vertical about 200 feet tall.
>>
>> 73, Jerry, K0CQ
>>
>> On 3/12/2013 4:26 PM, S. Earl Jarosh wrote:
>>>
>>>
>>> I know it is VLF but wouldn't it just be easier to turn up the damn 
>>> power?
>>>
>>>
>>> S. Earl Jarosh, N0HZ
>>> Twin City FM Club President
>>> Cell:  612.868.1313
>>> Off:   763.545.3275
>>> Home:  763.546.7897
>>> Fax:   763.546.7897
>>> earl at jarosh.org
>>> www.tcfmc.org
>>>
>>>
>>>
>>>
>>> -----Original Message-----
>>> From: nlrs-bounces at mailman.qth.net
>>> [mailto:nlrs-bounces at mailman.qth.net] On Behalf Of Dr. Gerald N. 
>>> Johnson
>>> Sent: Tuesday, March 12, 2013 5:08 PM
>>> To: nlrs at mailman.qth.net
>>> Subject: Re: [NLRS] Link -- New phase-modulation WWVB signal
>>>
>>>
>>>
>>> Just what those ancients using phase from WWVB to check local 
>>> standards need is more phase instability. I suppose the modern 
>>> answer is GPS and forget VLF.
>>>
>>> 73, Jerry, K0CQ
>>>
>>> On 3/12/2013 11:12 AM, Bill Davis wrote:
>>>>
>>>>
>>>>    Forgive me for the link to the mail list, but I think this is of 
>>>> very
>>> wide interest.
>>>>
>>>>
>>>> 73  Bill  K0AWU
>>>>
>>>>
>>>>
>>>> http://www.spacedaily.com/reports/New_NIST_time_code_to_boost_recep
>>>> tio n_for_radio_controlled_clocks_999.html
>>>>
>>>
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>>
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