On 12/20/11 6:02 AM, Ian White GM3SEK wrote:
> Pete Smith wrote:
>> Recently, on a whim, I bought one of these
>> thinking it might be possible to use it to switch beverages at a point
>> about 250 feet from my house. I knew, of course, that the little
>> hand-held remote couldn't possibly reach that far, but thought maybe I
>> could cobble something up.
> For a receive-only setup, you could easily run the 315/433MHz control
> signal up the coax, along with 12V DC power and the returning signals
> from the Beverages. A few inches of wire threaded under the shield braid
> at each end of the coax (like the old Monimatch) should make a good
> "launcher" and "catcher", and the coax link should deliver far stronger
> signals than over the air between antennas.
when I was looking at 2.4GHz for HF antenna control, I was more worried
about overcoupling and having the HF destroy the 2.4GHz stuff (or, at a
lesser scale, having it saturate the front end).
Say the receiver is designed for signals in the -50dBm range (max...)
and you've got that 100W RF (+50dBm), you need 100dB attenuation..
TowerTalk mailing list