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.

On Thu, 01 Sep 2005 12:24:41 GMT, "Joe Bloggs"
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

"Joe Bloggs" wrote in message
...
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/d...rs-circulators

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.co...eets/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/conten...ss_pe4243.html

Regards,

Bruce
http://www.rentron.com