[TowerTalk] Two signals on the same frequency?

[K8RI on TT]

On 8/14/2011 4:48 PM, Chet wrote:
> I don't think you will be any louder but At least one consequence of tx's on
> the same freq is a much wider bandwidth.

How so?  1 or 10 all on the same frequency, the strength adds 
algebraically, not the width.  They are the same frequency and would 
serve as one transmitter with twice the power in this case, but only if 
as others have pointed out the signals were in phase.

As pointed out there is the difficulty of keeping two transmitters not 
on the same frequency, but other than that it's simple math.

73

Roger (K8RI)
> "Hypothetically" It would likely  keep the other contesters from as cq'ing
> close to your frequency as they could running a single xmtr.
>
> Chet N4FX
>
> -----Original Message-----
> From: towertalk-bounces at contesting.com
> [mailto:towertalk-bounces at contesting.com] On Behalf Of Jari Jussila
> Sent: Sunday, August 14, 2011 12:25 PM
> To: towertalk at contesting.com
> Subject: [TowerTalk] Two signals on the same frequency?
>
>
> 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
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