Understanding Comms Episode 3.

[Scythe13]

It seems my idea of simple is not very simple.

Basically, you need to send and receive on the same colour (frequency) as the person you want to interact with.

I'm using the example of different colours as an introduction to CTCSS codes.

I'm trying to show it's possible to send on one colour and receive on another.

This would be easier with a diagram, but I'm not great with drawing them using just text.

If you send a blue signal, that will be heard by people's radios that are set to receive a blue signal.
If you send a red signal, that will be heard by people whose radios are set to receive a red signal.
But, if you send a red signal, but are receiving a blue signal, that's okay, as long as the other person is listening to a red signal and sending a blue signal.

Okay, I'll go for an arrow diagram to explain it.

SD transmitting yellow ====> HL Receiving yellow. HL hears SD.
SD transmitting yellow ==X==> BM receiving blue. BM does not hear SD.

HL transmitting blue ====> BM receiving blue. BM hears HL.
HL transmitting blue ==X==> SD receiving yellow. SD does not hear HL.

BM transmitting yellow ====> HL receiving yellow. HL hears BM.
BM transmitting yellow ====> SD receiving yellow. SD hears BM.

I think that's the best diagram I can come up with using just text symbols.

Does that help show that you need to send and receive on the same frequency (colour) as the person listening in? Your sending colour has to be the same as their listening colour. Their sending colour has to be the same as your listening colour.

Make more sense?