[time-nuts] locking oscillators - an increase in power and/or stability ?
Dr. David Kirkby (Kirkby Microwave Ltd)
drkirkby at kirkbymicrowave.co.uk
Wed Oct 8 20:54:50 UTC 2014
On 8 Oct 2014 20:15, <cdelect at juno.com> wrote:
> I came across this phenomena when transmitting with two 5KW transmitters
> via separate parabolic antennas to a satellite.
> If the phase of the TXs was correct the received signal at the satellite
> was 6db hotter!
I can explain that easy enough.
1) Two antennas properly phase gives twice the capture, so twice the gain,
so that gives 3 dB extra
2) Two 5 kW transmitters has 3 dB more power than the other.
3) 3 + 3 = 6
> I thought at the time that it was due to the power adding in the voltage
> For instance if you take a 1volt signal into 1 ohm you get 1 amp and 1
> watt. but if you take two 1volt signals and add them to produce a 2 volt
> signal then you get 2 amps and 4 watts.
> Not sure if my logic is correct but the phenomena is real!
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