General question on Interference when using a radio

Projects General Guidance
1

Hi

I am using a LoRa Radio (433mhz) a GPS module, a Spot satellite tracker (frequency unknown) und possibly a GSM module for backup. Obviously they use different frequencies, but could it be a problem to have this many devices at once? What else should I watch out for, so that I don't block any signals? (like using aluminium foil or something)

2

If you use a sender, keep its antenna far away from the receivers' antennas, to prevent surcharge of the receiver inputs by a strong RF signal.

3

DrDiettrich:
If you use a sender, keep its antenna far away from the receivers' antennas, to prevent surcharge of the receiver inputs by a strong RF signal.

You mean desensing?

Paul

4

You better know the English wording, I'm only German.

5

Any transmitter has the potential to cause problems with a nearby receiver. The transmitter could be a specific RF transmitter, such as LoRa, or anything that emits EMI such as a switching voltage converter or just the microprocessor itself.

A GPS (which is a very sensitive receiver) is prone to interferance when used on devices that also have a transmitter of some form or a fast running processor.

I found the problem with the USB Powerbanks when doing what is normal in this hobby, I was checking the performance of my project;

http://www.loratracker.uk/?p=474

LoRa when in extreme long range mode is operating at -20dB below noise so the signals it is receiving are very much weaker than in other RF systems.

If your expecting an ABC list of how to build a project using the components you describe, without problems, I doubt you will get it. Its normally a case of building it and checking it all works and interacts the way you want it to.