RF-KLP and RF signal

Wireless & IoT
1

I understand the RF-KLP uses ASK which means the RF signal is turned on and off to represent a 1 and 0. Other transmitters I’ve seen that use this scheme represent a 1 with the signal being on and a 0 with the signal being off. I have some other 433Mhz equiptment in my home so I need to be carefull about leaving the signal on when not in use.

I want to connect this device to the UART of a PIC chip since the chip is going to be too busy doing other tasks at the same time via high frequency interrupts so accurate bit-banging is not going to be possible. These UARTs have an idle value of 1(high) and flip the signal to 0 at the start of the byte and then flip it back to 1 at the end of the byte during the stop bit.

My question is do I need a NOT gate on the digital signal so that idle is represented by a 1 instead of a 0 or does the transmitter/receiver pair already contain this logic? Or asked another way, if the transmitter is not powered will the receiver output a 1 or a 0?

2

“My question is do I need a NOT gate on the digital signal so that idle is represented by a 1 instead of a 0 or does the transmitter/receiver pair already contain this logic? Or asked another way, if the transmitter is not powered will the receiver output a 1 or a 0?”

Major typo here. I want idle to be represented by no signal even through the UART represents idle with a 1.

3

There is a ongoing exchange of data regrading this type radio in the

machester encoding thread.

George