27 mhz rf remote controller schematics
Hello Wrigley.
27MHz is a quite low frequency.
You can use any diode available in the market (1n34 for example) to make a simple detector (sniffer).
With a 20 cm wire near the transmiting antenna you should be able to detect something. Then you can use a digital multimeter to see the signal level.
The detector will be as follows (according to the given connections):
Node1: antenna (20cm piece of wire) and capacitor C1 (100pF).
Node2: GND (negative of multimeter), anode of D1 (1n34), return of C2(10nF).
Node3: catode of D1, return of C1, R1 (100k).
Node4: return of R1, C2, positive of multimeter.
Make this circuit using reasonably short connections. Try to make it very compact so that you can use it for other measurements.
If you are not able to detect anything at all with the piece of wire (10 or 20 cm as said before) then maybe your transmitter is not working at all.
Use the same detector to inspect the circuit. Take away the piece of wire and use Node1 as the input. Go to different parts of the circuit and try to find (sniff) some rf.
In this way you may be able to find which part of the circuit is working and which is not.
After, when you will succeed to make the circuit work you can install the piece of wire (20cm) back into the detector (Node1). Then use the detector to optimize the transmitter to get the maximum rf power out of it.
Please, if possible post the schematics of your little transmitter in edaboard so that people can give their opinion.
Hope it helps.
S.