hi,
i want to ask...
if i want the range for TX and RX is in below 5m to detect(buzzer at RX make sound), what the suitable component that be able to use?

if i use RF module for 315MHz,it is suitable for long range communication..so,what component can i use for short range?

plz answer for me~

 

What in the world are you talking about?

 

sorry if u dont understand..
ok...
my project is 'sending data using RF modules'..

the RF component that i use is 315MHz and the range i get quite long..more than 10m..

i want to ask if the receiver at 6m or more far from transmitter ,i want the receiver not to response, even it receive signal from transmitter. It is possible to do that?

 

The odds are that your receiver input is a 50 Ohm coaxial port. You can purchase or make 50 Ohm attenuators (also called "Pads") rated in dB "Insertion Loss".

http://www.electronics-tutorials.com/basics/attenuators.htm

http://parts.digikey.com/1/parts/360857-attenuator-bnc-male-fmale-50-ohm-4391-50.html

There are a host of inexpensive 75 Ohm ("F" Connector) models made for the CATV industry too.

http://www.mjsales.net/itemsearch.asp?FamilyID=221