RF transmitter and reciever that works on both 315 mhz and 433 mhz ?

Status
Not open for further replies.
B

burrow

Full Member level 2
Joined
Dec 15, 2014
Messages
147
Helped
3
Reputation
6
Reaction score
3
Trophy points
18
Visit site
Activity points
1,148
I am totally confused. I messaged a few RF module sellers to ask if their product is 315 mhz or 433 mhz. and i got reply from many of them that it supports both .
I really don't understand what do they mean. I am sure its not the one with switch or anything to select one frequency(because they are cheap modules ) .Also one seller messaged me saying they share common receiver and only transmitter is different. Please throw in some light to this doubt
 

This sounds unlikely. Both transmitters and receivers have resonant LC circuits dimensioned differently for both bands. All modules that I know, either single fixed frequency or channel programmable have to be ordered for a specific band.

Technically, the output filter must be designed for a specific frequency band to achieve impedance matching and sufficient harmonic suppression. Receivers could be possibly multi-band, but I didn't see any yet.
 


SunnySkyguy said:
Most used SAW resonators with clearly marked frequency and many no longer active due to reliability issues with temperature etc.

Click to expand...





I am attaching photo of my reciever module. Their is a sticker on it which specifies 3 frequencies. I think by seeing it the seller thought it supports all 3.
 

Status
Not open for further replies.

Similar threads

Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…