Transmitter & Receiver sharing same antenna

Wireless & IoT
1

I plan to setup the TLP-434A type modules with a xmtr and rcvr that share a common antenna, running half-duplex on the same frequency.

I have a design (only on paper) that does T/R switching using a pair of PIN diodes, an inductor, a couple of C’s, and a couple of R’s. A PIC will be available to do the T/R switching, so it’s not necessary for it to be ‘automatic’.

Has anyone tried anything similar?

Is there a simpler way that is effective?

Given that the xmtr is rather low-power, is there any danger of damaging the front end of the rcvr?

Thanks,

Pete

2

Linx has a nice tech note on creating a transceiver here http://www.linxtechnologies.com/linx-kb … 23&lang=en

I’ve done this with a pair of TLP/RLP, but never with a shared direct

antenna connection. I used a Philips SA630 SPDT RF switch.

3

Thanks Bruce!

The SA630 (or something similar) looks like the way to go.

Pete

4

Hi Pete,

You’re welcome.

Let me know if you need a couple of the SA630. I can toss a few in an

envelope for you. We have a few spares left over from an old job.

They’re 8-pin SO surface mount package, but still easy to hand solder.

5

Thanks Bruce! I sent you an e-mail at the Rentron “tech” address.

Pete