RE: Yaakov : <<I vote Wi-Fi with 2 "Cantenas" or Helical-Directional-Antennas>>
Most surprizing was that it worked indeed. Last year I had for few month long collapse of the internet signal strength at home.
Thus I added to my 5.8 GHz router two Yagi antennas and I got about 5 km afar with this installation (what is damn much for so high frequency). For targeting used the satellite finder workhead. But then the phone tower was repaired and now I need no external antenna anymore.

I have used point-to-point WiFi links for many years, some were rather long range. But “works” in our instant case requires a handheld device that can be carried around. A high gain directional antenna and a WRT54GS router don’t fit that spec.

 

Indeed the entire project is nothing like it started out to be. At this point it seems like an FRS radio package with an added TOUCHTONE keypad, and a suitable tone to text decoder on the receive end would be the way to go. THAT will not require any body listening for a message at the computer end.
An alternative would be a speech to text program on the audio input of the computer, connected to the FRS receiver. For a farm application that could workout quite well. The equipment is widely available and the interfaces would be simple cables. And those radios are fairly rugged and reasonably compact.
The speech to text concept is better because of not requiring any custom electronics.

 

Indeed the entire project is nothing like it started out to be. At this point it seems like an FRS radio package with an added TOUCHTONE keypad, and a suitable tone to text decoder on the receive end would be the way to go. THAT will not require any body listening for a message at the computer end.
An alternative would be a speech to text program on the audio input of the computer, connected to the FRS receiver. For a farm application that could workout quite well. The equipment is widely available and the interfaces would be simple cables. And those radios are fairly rugged and reasonably compact.
The speech to text concept is better because of not requiring any custom electronics.

You can’t (legally) use DTMF on an FRS radio.

 

You can’t (legally) use DTMF on an FRS radio.

OK, so no DTMF, just speech audio into the computer. That can really be rather simple hardware, but it will take a good sound card and software.

 

We still don't know exactly what is needed or wanted ..........

If this scheme is for creating documentation of an inspection,
and the inspection is being done with a Golf-Cart, or a 4-Wheeler of some sort,
then a Networked-Laptop in the vehicle starts to sound viable.

Why does this scheme need to be in "real-time" anyway ?????

What's the point of all this ?

We're going to have to put on another Pot-of-Coffee before this is done.
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We still don't know exactly what is needed or wanted ..........

If this scheme is for creating documentation of an inspection,
and the inspection is being done with a Golf-Cart, or a 4-Wheeler of some sort,
then a Networked-Laptop in the vehicle starts to sound viable.

Why does this scheme need to be in "real-time" anyway ?????

What's the point of all this ?

We're going to have to put on another Pot-of-Coffee before this is done.
.
.
.

The specific intention is clearly stated in post #20, but without many of the additional qualifications. Certainly not exactly what post #1 was all about.
So this is a good example of what happens when folks ask for our help to their solution to a problem that we are not told about. AND, I am thinking that I have seen another thread about sending data over an electric fence line.
I did figure a protocol for doing it, but it is not very convenient nor technically simple. (One more non-completed project.)