[time-nuts] WWVB antennas

[J. Forster]

I doubt that a 'fractal antenna' is going to do very well at 60 kHz in a
size small enough to fit in a wrist watch.

YMMV,

-John

==================


> Google 'fractal antenna'.  Fractal Antennas are a relatively recent (late
> 1980's to mid-1990's) discovery/invention.  I have read that they are
> approximately 20% more efficient than normal antennas.
>
>  Jim, KG4FXV
>
>
>>________________________________
>> From: d0ct0r <time at patoka.org>
>>To: Discussion of precise time and frequency measurement
>> <time-nuts at febo.com>
>>Sent: Saturday, February 22, 2014 12:54 AM
>>Subject: Re: [time-nuts] WWVB antennas
>>
>>
>>I am impressed by Casio engineers who created tiny antenna for my wrist
>> watch. I don't know how, but that Pathfinder able to catch and decode 60
>> khz wwvb in noisy city environment. And it did even better when i was 500
>> km north !
>>
>>:40, Alexander Pummer wrote:
>>> here are the other 60kHz transmitters:
>>> http://www.ka7oei.com/wwvb_antenna.html
>>>
>>> U.S. based WWVB transmitter.  As described, it
>>>           could also be used for theUK-based 60 kHz MSF
>>> <http://en.wikipedia.org/wiki/Time_from_NPL>    MSF signal  formerly
>>> the Rugby clock*    *and the
>>> Japanese 60 kHz JJY  <http://en.wikipedia.org/wiki/JJY>_
>>> _our fiend in Australia most likely*_  _*receive the "JapaneseWWVB"
>>> 73
>>> KJ6HUN
>>> Alex
>>> _*//*_
>>>
>>>
>>>
>>>
>>>
>>>
>>> On 2/21/2014 12:21 PM, Robert Roehrig wrote:
>>>> John Forster said:
>>>>
>>>> "WWVB is hard to detect w/ a 3-foot diameter HP shielded loop w/
>>>> integral
>>>> preamp & 2 stages of mechanical filters. (HP 117A). The other half of
>>>> the
>>>> time it was undetectable. Paul S uses a loop that is much larger."
>>>>
>>>> I am near Chicago and I have 2 60 kHz antennas. One is a ferrite
>>>> rod type and the other a 5  foot diameter loop. Both are tuned
>>>> and feed identical 2 transistor preamp. The loop does work better.
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>>
>>-- WBW,
>>
>>V.P.
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>>
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