- Tue Sep 05, 2017 7:44 am
#196034
Hi All
I hope I'm posting this in the correct forum, it's RF related so I believe it's correct.
I have a transmitter and receiver combo, basic stuff really, the transmitter is a single button key fob (Similar to Garage Door opener) and the receiver basically has a relay that is activated when the transmitter is pressed.
The problem I had was that this combo was using 315Mhz, which is illegal to use here in the UK as it is a reserved frequency. My thinking was to swap the small capsule on the transmitter for a 433Mhz capsule and swap the RX board on the receiver, again for a 433Mhz board. This was simple enough to accomplish and appeared to work fine, however after putting the TX board back in its case, it stopped working so I removed it again and it was working again....... anyway, to cut a long story short, I discovered that the TX side would only successfully fire the relay if my finger was touching a small surface mount resistor on the back of the TX board.
My question is how do I fix this so that it works without my finger being there.
If you need more info or images of the boards in question then please let me know, I do not have a circuit diagram or a schematic.
Cheers
I hope I'm posting this in the correct forum, it's RF related so I believe it's correct.
I have a transmitter and receiver combo, basic stuff really, the transmitter is a single button key fob (Similar to Garage Door opener) and the receiver basically has a relay that is activated when the transmitter is pressed.
The problem I had was that this combo was using 315Mhz, which is illegal to use here in the UK as it is a reserved frequency. My thinking was to swap the small capsule on the transmitter for a 433Mhz capsule and swap the RX board on the receiver, again for a 433Mhz board. This was simple enough to accomplish and appeared to work fine, however after putting the TX board back in its case, it stopped working so I removed it again and it was working again....... anyway, to cut a long story short, I discovered that the TX side would only successfully fire the relay if my finger was touching a small surface mount resistor on the back of the TX board.
My question is how do I fix this so that it works without my finger being there.
If you need more info or images of the boards in question then please let me know, I do not have a circuit diagram or a schematic.
Cheers