I am trying to use several Arduino's with two-way radios because they are about half a mile away from each other. What I am trying to do is have one Arduino be in a box with buttons that then sends out an audio tone to a two way radio microphone input depending on which button was pressed. Then the radio transmits the signal to another two-way radio and that radio has an audio jack plugged into it. Then the Arduino on the receiving side then reads the audio tone to see if it is the right tone, and if it is, then the Arduino will activate a servo motor. What I am trying to do is figure out how to do this.
I would spend some time trying to explain what you are trying to do, it makes no sense to me.
Try some diagrams.
It would also help if you explain why you are trying to do what ever this project is doing.
Note you can’t build transmitters unless you are licensed to do so. The simplest way would be to get a radio ham’s licence.
It is very hard to transmitt and receive at the same time.
To try and make it sound simple:
Unit 1: Arduino + breadboard + battery + buttons connecting to the Arduino + Audio Output Jack. Then with two-way radios (Using frequencies allocated by the FCC for any use [legal]) transmits audio signal to unit 2.
Unit 2: Arduino + breadboard + battery + Motor Controller + Motor + Audio Input Jack. This Arduino reads the audio signal then if the signal is the correct tone it activates the motor.
If you are talking about walkie talkies for this it is illegal, they may only be used for voice. Take a look at LoRa which can provide secure, bidirectional, low-power, long range communication through both free and paid network services. Its wireless signals can reach across great distances, delivering tiny packets of data to and from multiple low-power node devices. There is a lot of information online about this including some Arduino libraries. Try this link for some interesting information: 11 Myths About LoRaWAN | Electronic Design
I don’t think you get it. You are describing what you think the solution to your problem is. All well and good but we need to know what your project as a whole is trying to achieve and why. What sort of distance are we talking about?
The Arduino is not very good with audio it is slow and doesn’t have much memory. A single tone is not very easy to decode, that is why the world’s telephone networks use a dual tone system.
Your topic has been moved here as this forum section is more relevant to the subject than where it was originally posted
Which section is that Bob?
The red text doesn't seem to do anything
It is now in Using Arduino/Project Guidance
It was originally posted in Using Arduino/Introductory Tutorials, which was not the correct section
Thanks Bob, but would i have found out where it had moved to?
I was assuming the red text had a link to somewhere and scanning over it shows no link.
You obviously found it otherwise you would not have seen my reply
I take your point about the underlining being confusing and will remove it
Bob, I haven't moved off the original thread and I will go to the new location now.
My point is that your text says "moved to this section", but doesn't say where.
Normally, when something says "moved here" or similar, the here bit is a link to somewhere else.
Yes, the underlining would normally come up with a different cursor, but is just the insertion cursor.
Obvious, no.
Ah, got it.
This is the new location.
Silly me
Why bother with audio?
If you just want to activate a servo, a simple pair of radio modules with some digital pins will do.
Are you wanting to position the servo according to the audio tone?
Not silly at all
It made perfect sense to me when I wrote it but your feedback shows that it was ambiguous
I have made another slight change to the text which hopefully removes that ambiguity
Thanks Bob
I know I getting too old for some of this.
The trouble is when I see "here" I look for here.
I can see that you meant here in this thread and I was looking at here, here (underlined), in the text, if that makes sense.
Now, if I could just find out how to underline the text, I would be happy.
Is it pre-formatted text? Done offline?
I could tell you but then I would have to kill you 
The clue is in the shadow text that appears in the edit box when you click 
Now you've got me clicking the Reply thingy in your text!!!
And I still can't see the clue in the shadow box. All I've got is expand to full screen, minimise the panel and hide the preview. In the editing box I've got Bold and Italics and most text editors would have underline as well and I haven't got a clue how you turned it red.
I just tried formatting some text offline and pasting it into pre-formatted text, but it ain't red and it ain't underlined.
I going out for a walk
Crikey Bob, this is worse than Twenty Questions.
OK The box on the left is the shadow box - new one on me - and the one on the right is the preview box.
Yes, I am looking at what you posted.
Nothing in the top row says underline and I thought </> was where you put code. It's now pre-formatted text.
It says "use Markdown etc. to format". Surely not?
I've heard of Markup and done a little HTML, but what the hell is BBCode? Bulletin Board Code?
I give up. You are going to have to let me into secrets of writing red underlined text.
I have to say that this new forum layout came as a bit of a culture shock.
Plus I'm not best pleased that 11-years of hard earned points has been reset to zero.
Judging by by some of the comments from some of the star posters, nor are they.
As I said somewhere else, it's like changing bank accounts and they nick all your money as a thank you. Worst than losing your Clubcard points.
If you ever used code tags then you have used BBCode so there is really nothing new in the World. </> is still used to create a code block but if you want to you can use other methods.
One reason why underline is not available as an icon is the possibility of underlined text being mistaken for a hyperlink (sound familiar ?)
What are these points that you refer to ?