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Re: LF: TX > RX isolation test

To: [email protected]
Subject: Re: LF: TX > RX isolation test
From: Claudio Pozzi <[email protected]>
Date: Thu, 19 Jul 2018 16:41:14 +0200
In-reply-to: <[email protected]>
References: <[email protected]> <[email protected]> <[email protected]>
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On Wednesday, July 18, 2018 05:34:51 PM you wrote:

SNIP

> 
> Perhaps so but now I do not understand how the coupling can be only
> -21 dB. The efficiency of the TX antenna is < 0.1% and surely the
> little RX antenna is very inefficient also. How can I have only 21
> dB loss of signal between them? What is the method of coupling or
> signal transfer for antennas in such close proximity?
> 

Few meters from the transmitting antenna: at those frequencies the "reactive 
field" dominate, so the inverse square law is non applicable.

73 de Claudio, IK2PII
 
 
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