Welcome to AAC!
If the Tx and Rx are in fixed positions you could use directional antennas.
Increasing the Tx strength (if legal/possible) would increase range.
Hi Alec, they are in fixed positions. I have attached a photo of ready made wire antennas, do you think these would do the trick or did you have something else in mind?
Thanks Eric, can I just add the new antenna wire to the existing or should I remove any of the existing antenna as the clip said the length is critical?
hi,
Remove the existing antenna carefully, so that if need be you can reuse it.
Also keep the RX away from any electrically noisy equipment in order to minimise any interference.
Can I just ask a question about “pairing” the motion sensor to the receiver. If I only have one sensor and I want to put the receiver on a timer, do I need to pair at all? I assumed pairing is only for when you have more than one sensor on the same receiver?
Eric, the original built in antenna is soldered at both ends inline in the circuit board, what’s the procedure if I am to solder the replacement antenna as pictured please?
Eric, that’s what I want to do . You wouldn’t happen to have the diagram or pointers and I can start from scratch? I was initially going to try and boost the signal/distance of an existing system but I’m starting to think it might be an idea to build a simplistic setup!
hi,
This is the user HC12 document, as you can see its a 5V TX/RX module, with 99 selectable channels, in the 400MHz band
It uses R232 data format, mine is set for 9600 baud, which is about 1000characters/sec.
The range is very good even with the small coil antenna.
You could easily program a Arduino Nano module for the TX and RX modules.
Using a Arduino enables the security system to be 'smart'
I use the PIR detector outputs, which are +3Vout when activated, connected to an Analog input of the Arduino.