Joining a RF Tx & Rx together

[Joe Bloggs]

Hi,

I need to make an 433MHz transceiver that is running half duplex.
I have a separate transmitter and receiver but I need both of these to share
the same external aerial.
Question is, how do I join the two?
If I were to just connect the two together I would think that I could
potentially cause damage to the receiver by over loading the front end and
also possibly damage the transmitter by placing to heavy a load on it ??

Thanks,
Neil.

 

[John Fields]

On Thu, 01 Sep 2005 12:24:41 GMT, "Joe Bloggs"
<somewhere@nothere.com> wrote:

Hi,

I need to make an 433MHz transceiver that is running half duplex.
I have a separate transmitter and receiver but I need both of these to share
the same external aerial.
Question is, how do I join the two?
If I were to just connect the two together I would think that I could
potentially cause damage to the receiver by over loading the front end and
also possibly damage the transmitter by placing to heavy a load on it ??

---
Why can't you use an appropriate relay?

--
John Fields
Professional Circuit Designer

 

[DBLEXPOSURE]

"Joe Bloggs" <somewhere@nothere.com> wrote in message
news:dqCRe.18931$FA3.18763@news-server.bigpond.net.au...

Hi,

I need to make an 433MHz transceiver that is running half duplex.
I have a separate transmitter and receiver but I need both of these to
share the same external aerial.
Question is, how do I join the two?
If I were to just connect the two together I would think that I could
potentially cause damage to the receiver by over loading the front end and
also possibly damage the transmitter by placing to heavy a load on it ??

Thanks,
Neil.

You need a UHF Circulator

http://www.procom-dk.com/component/d0201-rf-isolators-circulators

 

[Bruce]

I need to make an 433MHz transceiver that is running half duplex.
I have a separate transmitter and receiver but I need both of these to
share the same external aerial.
Question is, how do I join the two?
If I were to just connect the two together I would think that I could
potentially cause damage to the receiver by over loading the front end and
also possibly damage the transmitter by placing to heavy a load on it ??

Thanks,
Neil.

The easiest route is to just us an RF switch IC. Here's a datasheet on the
Philips
SA630 RF switch.
http://www.semiconductors.philips.com/acrobat/datasheets/SA630.pdf

We use this particular unit.

Peregrine Semi has several antenna switches also, but I've never used them.
http://www.peregrine-semi.com/content/products/wireless/wireless_pe4243.html

Regards,

Bruce
http://www.rentron.com