Standard Horizon Handheld - not transmitting on ch.80

[PilotWolf]

Radio signals are not immune to EM interference - assuming that EM is electromagnetic in your posts. There is a huge subject matter on EM interference and protected users rights over being able to use their frequency allocation(s). All electrical equipment is supposed to met exacting standards to meet the regulations. Much of it doesn't unfortunately, despite being marked as compliant. Amateur radio users spend much time helping neighbours that suffer interference from transmissions despite the issue usually being with the equipment that is being interfered with.

Wifi does not use FM (frequency modulation) but Orthogonal Frequency-Division Multiplexing (OFDM) or Direct-Sequence Spread Spectrum (DSSS) depending o whether it is 802.11 a, b, g or n. So the equipment can't really be compared to a 'normal' radio receiver as such.

seacomm explained the reason and how the stronger (FM) signal is heard above the weaker one in his/her post. AM signals will merge and you'll hear both or multiple stations at the same time.

PW.

 

[lustyd]

Here you go I didn't mean interference from dodgy equipment, I meant interference from another signal on exactly the same frequency. All EM is subject to this, and if two signals are broadcast right next to each other (say, outside a marina) then regardless of transmission power they will interfere with one another and there will be strong and weak spots. Even allowing for the fact that the frequency is varying there will still be interference in two signals so close together.

Finally, if interference doesn't exist on FM then it's odd that the BBC would go to all this effort explaining it.