[TowerTalk] Fwd: Two signals on the same frequency?

[HansLG at aol.com]

Best (in phase) scenario you will get better signal. The other question is  
whether you will exceed the power limit. You could, theoretically use two,  
maximum legal power and end up with four times received signal instead of 
the  doubling you could get with one transmitter and two antennae in phase. 
The next  question (if you have a good supply of amplifiers and transmitters) 
is how good  signal you could get with, say, ten (10) transmitters. 
 
Also, you should be able to get some benefits from using several receivers  
at the same time too, at least at the higher (<144 MHz) as the received  
signal is coherent but the noise is not.
 
Hans - N2JFS
 
In a message dated 8/14/2011 5:38:00 P.M. Eastern Daylight Time,  
k8ri-on-towertalk at tm.net writes:

A  hypothetical question:
>
> I have two antennas for the same band.  The antennas might be same kind
> (eg. two dipoles, two yagis) or  different (one dipole, one vertical).
> I transmit with two separate  transmitters - one to one antenna - but
> modulate the transmitters  simultaneousl*y *with same key or microphone.
>
> How does my  signal-strength change on the other side in comparison if I
> used only  one transmitter and one antenna? The antennas are not phased
> to each  other and they might be quite apart from each other.
>
> I know  that the advanced contest stations have one beam to eg. JA and
> one to  Europe etc.  But if they turned both antennas to JA, would the
>  signal-strength go up?
>
> Jari, OH2BU
>  _______________________________________________