Ok, so i’m on the hunt for some long range transmitter / receiver gear to simply send the status of a reed switch, literally just input to be monitored.
Problem is the distance is about 200 - 300m with a fairly large hill, not line of sight. I’m really having trouble finding anything in the 900mhz range for a Transmitter / Receiver, not sure if this is stepping on the feet of RSMNZ (Radio Spektrum Management) but its really my only option, plus would only transmit like twice a week (deep sleep ESP8266)
I am considering taking one of these and modifying it to transmit the reed switch. Should just output PWM.
I know these are 2.4 but from my days flying I know the range is pretty decent and they output at a high power.
Your thoughts or any ideas that could be of use are more then welcome.
The range is really limited by the transmit power and that is typically the same for 433MHz and 800/900MHz.
433MHz is better to penetrate object due to the lower frequency.
The 800-900 MHz part of the spectrum is very busy and allocation of free to use frequency blocks varies a lot from one country to the other. Transmitters on that part of the spectrum need good quality filters, there’s typically a lot of cell phone bands close by you could be stepping onto.
The 433MHz spectrum is a better choice for DIY, as mentioned.
Entirely dependend on tx power, antenna design and what is in your line of sight. In general, the lower the frequency the better the range, all other things being equal.
Try these. I use them everywhere. I typically get around 1km range with them.