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why is my 433MHz wireless receiver outputting a 6Hz pulsating output? Answered

hello, i recently bought this receiver http://www.dinodirect.com/315MHz-433MHz-Wireless-Receiver-Board-Module-AK-R02A.html
and have tried it out with my 433MHz transmitter, and something strange happens.
im using it to light up an led, and the led is flashing at what ive calculated is about 6Hz. why is it doing this?
for some reason it ceases to do this when i hold the antenna of my transmitter within 2-3cm of where the antenna of the receiver should be (i havent added an antenna yet), and the frequency drops the further away the transmitter is, though not by much, maybe down as low as 4hz at 30M.

could this have something to do with the fact that the frequency crystal says R315A? does this mean that its 315MHz and not 433MHz like my transmitter?, i wouldn't expect it to work though, and i did order it as 433MHz or could it be just the led? i have nothing else which i can use to tell otherwise.

what i want the receiver board for is to power a relay. i haven't got the relay yet though. will this cause the relay to rapidly switch on and off?

the transmitter i am using is a standard 4 channel 433Mhz transmitter (brown wood style plastic cover) standard with any wireless modules available on eBay and receiver transmitter combos on dinodirect.

on both ebay and dinodirect, none of the sellers have a clue about where the datasheet for this is, or how they work (i doubt at dinodirect they even know what it is).


Hi R315A is @ 315 Mhz frequency.

The chip should be R433A to work @ 433.92 Mhz, wrong chip !

You can change oscillator with resistor on pin 15 or 16 on SC2262 chip

1.5M, 3.3M or 4.7 M resistor change oscillator

See U

If your chip is PT2272 see datasheet for oscilator frequency

Sorry, moral here is NEVER buy without a datasheet.

Add the antenna and see what happens.


for some reason no datasheets exist for any of the simple non data based receivers and transmitters. its one of the most useful and cheap wireless technology, on average with a receiver/transmission distance of 300M+.
silly isnt it.

still, do you have a theory perhaps as to why it is pulsating the way it is?

i can already buy a properly functioning one for less that than plus it comes with 4 channels, each which switch a relay, plus a remote, and the range is 300M+ depending on weather conditions.

besides, mine has a decoder on it already.

i got it to work now. odd thing is, it will work flate dc if i use 4x AA's, but not 2x 1/A's , despite the fact that the 2x 1/2A's produce 7.2v in total, and are very much able to supply the required 5ma current which it must operate as it says in its specs.

the antenna didnt help at all