[Scan-DC] Cordless Phones/Aircraft Interferance

[Shawnerz]

HHmmm...it could, but let me think this through for a
second.
*Typically* the 3rd harmonic is more troublesome than
the 2nd.
But looking at the 2nd harmonic, a 5 watt HT would be
putting out +37dBm.  Does anyone know how far down
harmonics have to be for FCC type accecptance?
If the harmonics are, say, 60 dB down, then the
harmonics would be at -23 dBm into a poorly matched
antenna.
0 dBm is 1 mW so -20 dBm would be .01 mW or .00001
watt.  Another half power for the remaining 3 dB would
be .000005 watts of RF power.
-23 dBm is still a healthy level however most
non-secure military comms in that band is AM and most
ham communication is FM.  The presense of a RF carrier
would still interfere, but -37 into a poorly matched
antenna, travelling, say, 5000 ft, to a receiver tuned
to detect a different mode of modulation, *probably*
wouldn't cause any problems.
Anybody have any experience in this arena?
-Shawn
  
--- "William D. Rossiter III" <KB3ITA@comcast.net>
wrote:
> Woundn't two meter ham gear cause interfearance in
> the milaircraft region?
> I say this because the first harmonic of the 2 meter
> band is between 290 and
> 300 MHz, and would'nt any planes flying over one's
> house hear the harmonics
> of these hams?
> 
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