actually its a 433mhz module to its supposed to be 17cm
but what do u mean stright up from the ground plane ?
ANT and GND pins are not the same and not connected
and why it stop working if i attach any wire to the ANT pin alone
I'm guessing it is one of the two big holes down at the end of the PCB opposite the header. The CHINGLISH on the data sheet calls it "RECEIVING INSTRUCTION"
i never tried to connect it to this pin "receiving instruction" i will try and let u know
this module is 4 channel module, when i press a button , it momentary switch one of the corresponding outputs high
this pin is high whenever i press any button.
no data sheet for this module as many Chinese products.
the ANT pin which i think is antenna , is connected to IC 3310A pin thought a resistor
Where is the transmitter when you connect the RX antenna?
It is possible that you have a strong interfering signal in the vicinity. With the antenna connected, the interference might be blocking the receiver. With no antenna connected, the nearby transmitter can overwhelm the interference.
It is possible that you have a strong interfering signal in the vicinity. With the antenna connected, the interference might be blocking the receiver. With no antenna connected, the nearby transmitter can overwhelm the interference.
i dont think there is any interference ,
however i took the circuit and placed in completely different room, with nothing close to it
exactly the same behavior
the strange thing is that when i put the remote very close , the circuit stop working as well !!
RF overload! Put the antenna on, and then have someone walk away with the transmitter while you watch the receiver decode the signal. I'll bet that at some greater distance, it will start to work...
RF overload is controlled by tuning the wanted signal at the input ahead of the RF amplifier. Cheap circuits amplify anything and exerything (and therefore are overloaded) before the tuned circuit.
Good circuits have a wide useable range of input level. Cheap circuits are overloaded.
Is your cheap circuit designed and made in China? Too bad.
Nope, yours for buying a cheap RF module =\
You get what you pay for in the end.
Do you have any concrete range requirements you're shooting for? You could use your module as is for basic testing at the ranges it's happy with, but you need to buy a better module