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" <jimfar...@att.net>
To: <t...@patoka.org>; "Discussion of precise time and frequency
measurement" <time-nuts@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 <t...@patoka.org>
To: Discussion of precise time and frequency measurement
<time-nuts@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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