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LF Antenna design - RF Cafe Forums
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pollypocket
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Post subject: LF Antenna design
Posted: Wed Oct 25, 2006 2:56 pm
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Joined: Wed Oct 25, 2006
1:49 pm Posts: 2 Location: ON
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Hi; I am looking for some guidelines for
LF 134Khz antennea. I install readers in some awkward
places and don't always need an off the shelf antenna.
I want to be able to construct a decent antenna
using 20 gauge multistrand wire in a loop(s)...speaker
wire or lamp cord. It is cheap and fast and should
be able to get the job done. Any advice besides
sticking to a commercial antenna? thanks,
Paul
_________________ Ride Hard, Shoot Straight,
and Tell the Truth
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nubbage |
Post subject:
Posted: Mon Oct 30, 2006 12:39 pm
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Joined: Fri Feb 17, 2006
12:07 pm Posts: 218 Location: London UK
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nubbage |
Post subject:
Posted: Tue Oct 31, 2006 4:32 am
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General |
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Joined: Fri Feb 17, 2006
12:07 pm Posts: 218 Location: London UK
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Hi Paul Further to my earlier posting I found
this formula in an excel file I have built up over
many years of formula hunting. It gives the antenna
terminal voltage into an infinite load impedance
for a linear solenoid wound antenna of the type
you have in mind. V = 7.89E-6*F*N*A*H0 volts
where H0 = received field strength A/m
F = Freq in Hz N = number of turns A = area
in sq m The value of H0 you would have to
estimate from known parameters for the transmitting
source and detection range. I am not sure,
but someone else may know: if you tune the coil
and the total Q value is Q then the voltage becomes
V*Q at resonance (??)
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pollypocket |
Post subject:
Posted: Sun Nov 26, 2006 11:53 am
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Joined: Wed Oct 25, 2006
1:49 pm Posts: 2 Location: ON
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Hi Nubbage; Thanks for the advice and links.
I will have a look. Regards, Paul
_________________ Ride Hard, Shoot Straight,
and Tell the Truth
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Posted 11/12/2012
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