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Re: LF: Loop questions

To: [email protected]
Subject: Re: LF: Loop questions
From: [email protected]
Date: Mon, 11 Feb 2002 16:50:40 EST
Reply-to: [email protected]
Sender: <[email protected]>
In a message dated 2/11/02 2:09:07 PM Eastern Standard Time, [email protected] writes:
<< Here are my questions.

1) Does this "high impedance antenna?"  suffer from the same problems as a
high "Q"  vertical such as absorption from trees, ground etc?  So that
removing it from this environment might increase signal strength? >>

A series-resonated loop is not a high-impedance antenna. As should be clear from Bill Ashlock's experiments, transmitting loops are less immediately affected by some aspects of their environment; but they are affected by close proximity to any somewhat conductive surface, as you found out by raising your loop above ground.
<< 2) Would I benefit from using Litz wire?  >>

Maybe.

<< 3) Does higher "Q" neccessarily mean more radiated signal? >>

Not absolutely, but it does indicate reduced losses, which is generally more conducive to radiated signal strength.
<< 4) In most cases I don't belive we want the coil to radiate but in this
case
I want to increase it. Any ideas on how to do that? >>

Area enclosed by the loop is the key. But in this case, Paul, I believe you may be asking the wrong question. DO you really want to do that? If you're planning to put the transmitter at the loop, fine. But remember that the regulations under which we work here currently limit us to a total antenna of 15 meters--INCLUDING transmission line, which in your current setup is already 110m.
73,
John







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