RF link

[dhouston]

Using the FM-RTFQ1-433 transmitter and a FM-RRFQ1-433CTC receiver to send some data across a short range from one PIC to another. Using the code above the timer starts but when I try to send the data over the rf link the timer doesn’t work. I can see the data out on the receiving module and I know rf is present since I have connected it to a spectrum analyser and there is a nice peak at 433Mhz. The pins have supply voltage and ground where required. Is there anything in particular that I am doing wrong in order to get the rf link to work?

See p4 of the datasheet for the receiver. The RSSI pin outputs a voltage that is proportional to the received signal strength. This should be zero in the absence of a signal. You can use it with an ADC pin to determine when a signal is being received or amplify it and use it as a Carrier Detect signal.. Since these are FSK (i.e. FM), I would dispense with the TRAIN,TRAIN,TRAIN chain (personally, I dispense with it for ASK, also). What is the application?

EDIT: If you are not using the pins for something else, you can use one of the 16F88 comparators to create a CD (carrier Detect) signal. With the RSSI pin as one input and the other input to GND, configure the comparator so the output is high when there's a signal and low when there's no signal.

[n qwerty]

ok thanks for the advice, i will give it a try and no doubt will be back on here.