433 Mhz receiver: How to get a better reception?

olli

Hi guys,

I use the crap receiver mentioned above. I’ve putted a 10nF and a 100nF capacitor between GND and VCC. As Antenna i use a steel wire with 173mm length.The Receiver is powerd directly from the PI(my Nano delivers only 4.7V!). What shoud I say… Receivers Range is now about 10m!!!Much better then without the capacitors(1-2m).

lschip

Hi, I have received my receiver mentioned above.
The reception is better now but stil poor (8 meters without walls).
And again, with two antennas for reception and transmission I don’t receive anymore. I have to cut of the antenna of the transmitter to get any reception.

I give up, I don’t believe in a good receiver anymore… going for another solution…

beikeland

My random input on trying to get better reception:

I’m hoping to build one of these when i get the parts, to help quantify signal strength.
http://www.zen22142.zen.co.uk/Circuits/rf/fsm.htm

I’ll start off by having a too long antenna, and cut it down to length as i log the RF output. When I pass the peak I’ll replace the antenna with the correct length, tailored to the installation.

I tried making antennas by following the two guides below, but i still experience a better signal with a straight wire. But the instructable does claim improved signal.
http://www.instructables.com/id/433-MHz-Coil-loaded-antenna/
http://www.elektor.nl/Uploads/Forum/Posts/How-to-make-a-Air-Cooled-433MHz-antenna.pdf
(used this site to compensate for Ø0.50mm copper with Ø0.98mm insulation and came up with 20 turns on a 3.0mm air core, but didn’t help much http://www.k7mem.com/Electronic_Notebook/inductors/coildsgn.html#Design_Cons )

Using these modules http://www.dx.com/p/mini-rf-transmitter-receiver-module-433mhz-wireless-link-kit-for-arduino-blue-black-412023 and they actually perform better than my original Tellstick.net. Have ordered the recommended 3400 kit as well, and will compare signal strength/receive sensitivity.