Olin Lathrop wrote:
> Michael Watterson wrote:
>   
>> No licence for user, maybe, but you can't self build CB (27MHz) in
>> most countries. It has to be an approved product.
>>
>> You can self build on 28MHz if you have a Amateur licence. AFAIK only
>> Licenced Amateurs can self  build without getting the equipment
>> certified.
>>     
>
> Those are the legal restrictions.  The point was more about what you can get
> away with.
>
>   
unless you have good test gear and know how to use it and a knowledge of 
the local spectrum plan and users, you won't know what you can "get away 
with".

A city council thought they could get away with low power 10GHz "burglar 
alarm" type  movement sensors to sense people at pedestrian crossings. 
It disrupted Point to Multipoint   8Mbps  broadband for  over  4,000  
users (10.2GHz downlink, 10.6Hz approx uplink).  Due to the political 
influence the  compromise was to re-tune all of them to 10.450GHz and 
the regulator made that a "licence free" band for Type approved 
equipment. :-)   The FCC might have made them replace them all with 
camera based person detectors in USA, or not :D

The local Pirate CB operators use official commercial gear, but at 146 
to 148MHz as the Official Band ends at 146MHz here unlike USA.

Home built Transmitter operators without a licence tend to be short 
lived, even here, as they rarely know what their transmitter is *really* 
doing.



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