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

[Donn, WA2VOI]

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_receptio
>>> n_for_radio_controlled_clocks_999.html
>>>
>>
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>
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