LF: Antenna switching 72/136kHz

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LF: Antenna switching 72/136kHz

from [Rik Strobbe]

[Permanent Link][Original]

To:	[email protected]
Subject:	LF: Antenna switching 72/136kHz
From:	"Rik Strobbe" <[email protected]>
Date:	Wed, 22 Mar 2000 20:00:18
In-reply-to:	<[email protected]>
Reply-to:	[email protected]
Sender:	<[email protected]>

In my previous mail I forgot to mention that 'parallel tuning' of the
antenna will only work with a high-impedance RX input (FET-preamp). For 50
Ohm input series tuning can be used (an additional series capacitor between
RX and loadingcoil).
This capacitor can be short-circuited to switch from 136 to 72kHz. A simple
low-voltage relais will do.
Thanks to Jim (M0BMU) to point this out.

73, Rik  ON7YD

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