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

[S. Earl Jarosh]

Got to love you, Donn.  I make a smart-ass wise-crack and I always know you
will come back with a great response.  You make a great straight man!!

Thanks for the info.  Hope to see you in Buffalo!! 


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 Donn, WA2VOI
Sent: Tuesday, March 12, 2013 8:46 PM
To: geraldj at netins.net; nlrs at mailman.qth.net
Subject: Re: [NLRS] Link -- New phase-modulation WWVB signal



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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