[South Florida DX Association] Re-sending previous Message

[Kai Siwiak]

Adam,
No allocation was needed in the USA, around 1970-72 or so there was a 
Raytheon initiative to do that on the 2.4GHz ISM frequency. It was 
stopped dead by that bullshit article "Zapping of America" by Paul 
Broduer. We are still living with the various scares he caused, 
including the FCC mandated RF exposure rules. I remember seeing demos of 
the Raytheon technology. It relied on a very efficient patented 
dipole+diode called a "rectenna". Neat stuff, but I'd rather have WiFi 
polluting that band.

This "new" thrust is nothing especially innovative. They've been hawking 
it for 2-3 years. They use tuned loop antennas that are really a tunned 
"transformer" where the coils can be separated a few meters. Big deal. 
Coupling is in the near field of course, and there is leakage into the 
radiated field. In other words they can cause interference world wide. 
It is not a very efficient way to transfer power. If they can be kept to 
the 13.56 MHz ISM frequency we should be ok, but they run the frequency 
open loop. It can be anything! It is an EMI nightmare.

-Kai

Adam Farson wrote:
> Hi Kai,
>
> Do you recall all the goomflah about microwave transmission of power to the
> earth's surface from solar-collection satellites a few years ago? The
> popular-science media gave it wall-to-wall coverage.
>
> By refusing to allocate frequency bands for it, the ITU stopped it dead in
> its tracks before the first pilot trials could even be launched. 
>
> Cheers for now, 73,
> Adam VA7OJ/AB4OJ
>
>
> -----Original Message-----
> From: sfdxa-bounces at mailman.qth.net [mailto:sfdxa-bounces at mailman.qth.net]
> On Behalf Of Kai Siwiak
> Sent: 26 July 2009 11:09
> To: farson at shaw.ca
> Cc: SFDXA Reflector
> Subject: Re: [South Florida DX Association] Re-sending previous Message
>
> I've been following this for two years for the RF Exposure Committee. 
> Nothing new here except more "media and marketing". There are RF exposure
> issues as well as severe EMI issues. The technology is nothing particularly
> new, except perhaps to these naive professors.
> Kai, KE4PT
>
> Adam Farson wrote:
>   
>> Hi Leon,
>>
>> We can be reasonably sure that if this system interferes with licensed 
>> radio services, the ITU will nix it - just as they have all other 
>> "wireless power transmission" schemes to date.
>>
>> Cheers for now, 73,
>> Adam VA7OJ/AB4OJ
>>  
>>
>> -----Original Message-----
>> From: sfdxa-bounces at mailman.qth.net 
>> [mailto:sfdxa-bounces at mailman.qth.net]
>> On Behalf Of K2EWB
>> Sent: 26 July 2009 10:28
>> To: LARA; SFDXA
>> Subject: [South Florida DX Association] Re-sending previous Message
>>
>>
>> FYI
>>
>>
>> Subject: [TowerTalk] 30m AC Power Transfer Antennas
>>
>>
>>  Hi Folks,
>>
>>  Tesla's wireless power transfer has returned targeting the hundreds 
>> of millions of cell phone owners!
>>
>>  I wonder how far from the 30M source the signal used to charge these 
>> devices can be heard?
>>
>>  The radiating element/antenna must be very efficient for this thing 
>> to pass the green test. I wonder how well such a radiator would work 
>> on ten meter?
>>
>>  http://news.bbc.co.uk/go/em/fr/-/2/hi/technology/8165928.stm
>>
>>     
>
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