[Antennas] How can I tell if my signal is getting out?

[George, W5YR]

Dave, try 50 db gain to get from one milliwatt to 100 watts . . .

30 db (x1000) gets you from one milliwatt to one watt

20 db (x100) gets you from one watt to 100 watts

Total: 50 db (x100,000) to raise one milliwatt to 100 watts

That path loss is a little scary, too!   <:}

Again, this model ignores the presence of uncorrelated nosie sources at
either or both terminals of the circuit. The theorem predicts the same
signal level at each end, but does not comprehend the S/N which is what
determines whether or not a signal can be copied. Also, the path loss is
usually far from constant in HF situations, varying widely with time of
day, sun state, etc. It can be -300 dB when A transmits to B and -600 db
when B transmits to A. Another demonstration of the fickle finger of
science . . .   <:}

73/72/oo, George W5YR - the Yellow Rose of Texas         
Fairview, TX 30 mi NE of Dallas in Collin county EM13qe   
Amateur Radio W5YR, in the 56th year and it just keeps getting better!
QRP-L 1373 NETXQRP 6 SOC 262 COG 8 FPQRP 404 TEN-X 11771 I-LINK 11735
Icom IC-756PRO #02121  Kachina 505 DSP  #91900556  Icom IC-765 #02437

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Dave Shrader wrote:
> 
> It really does !!!
> 
> Example:
>         +2.3 dB = dipole on windowsill at first station
>         -8000 dB = path loss
>         +6.0 dB = beam at 100 feet at other station
>         +1000 dBm = Power out either station [100 watts]
>         ----------
>         -6991.7 dB either way