Re: Sharing an antenna between Rx and Tx RF modules ?
- From: "Paul E. Bennett" <Paul.Bennett@xxxxxxxxxxxx>
- Date: Wed, 02 Jan 2008 19:04:18 +0000
Simon Clubley wrote:
I'm currently doing some experiments with 433MHz license free RF modules.
Is it practical to share one antenna between a Tx and Rx module in a
half-duplex environment, and if so, what techniques are used ?
I would need a microcontroller to be able to switch the antenna between
the Tx and Rx modules as required.
I know that the proper solution would be to use a transceiver with Tx and
Rx enable pins, but I am wanting to reuse some modules that I have
available.
In case it matters, this is in a hobbyist environment.
Thanks for any information,
Simon.
The simplest switch is either a suitable RF relay or a 1/4 wave element and
a pair of fast switching diodes in the input of the receiver. The latter
arrangement protects the receiver from the transmitter output and allows
the weaker signals for the receiver input to be seen. If you need to
transmit and receive at the same time (on different frequencies of course)
then very sharp pass-band filters for the transmitter and a sharp pass-band
and notch filter for the receiver is required.
[diagram by email]
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Mob: +44 (0)7811-639972
Tel: +44 (0)1235-811095
Going Forth Safely ..... EBA. www.electric-boat-association.org.uk..
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