[time-nuts] WWVB antennas

Alan Melia alan.melia at btinternet.com
Sat Feb 22 11:50:48 EST 2014


Claims on antenna efficiency at these frequencies are fairly meaningless (as 
always) in that a "normal" antenna efficiency would be less than 1% !!
Alan
G3NYK

----- Original Message ----- 
From: "JIM FARLEY" <jimfarley at att.net>
To: <time at patoka.org>; "Discussion of precise time and frequency 
measurement" <time-nuts at febo.com>
Sent: Saturday, February 22, 2014 4:28 PM
Subject: Re: [time-nuts] WWVB antennas


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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