solarwind wrote:
> Hi all,
>
> I'm going to be using simple electronic components to design and build
> radio transceivers as I attempt to learn more about radio
> communications. I eventually want to try and get some long range
> communication going (few km). I don't want to disturb other people's
> communications or devices. Which band would be the best to experiment
> on? I know that there are several unlicensed bands like the ISM bands,
> FRS, and CB bands. Are there any other I can consider? I want to try
> to keep the antenna length short so a 400+ MHz frequency sounds
> reasonable.
>   
Hmm.. They are really "pre-licensed". Devices must meet and have CE/ETSI 
approvals in Europe or FCC in USA.

Virtually EVERY country you need to have the device tested and certified 
to deploy it without a licence. The only method to legally deploy an 
uncertified transmitter in virtually every country is to have a full or 
nearly full Amateur licence. Then many bands are available.

Licence free AKA ISM deployment is only "licence free" for a customer of 
a pre-approved, marked device. not DIY free for all.

Anyway proper radio people only test Aerials on air. Transmitters are 
tested with dummy loads and test gear. Which you can in theory do with 
no licence if no RF is radiated.

What's the difference between a signal generator connected by coax to 50 
Ohms and a Transmitter in the same circuit? None.
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