Tom Saunders wrote:
>>about 55% of each transmitter's
>>output gets burned up in a dummy load, each time two signals are
>>combined. Thus, eight 100 watt repeaters combined into one antenna will
>>have about 11 watts at the antenna.
>
>
> While it is true that aprox. 50% of the power from each transmitter is
> lost in the combiner, the remaining 50% gets thru. So a 100 watt
> transmitter will send 50 watts out to the transmission line. 50 * 8 =
> 400w total.
>
> Tom Saunders
> Comm Tech, City of Seattle
> Amateur Radio Station N7OEP
> 206.384.1604
> [EMAIL PROTECTED]
No-doesn't work like that. For every two transmitters you combine, you
have ~3dB loss. So for 4 tx's, you have 6 dB loss, and for 8 tx's, you
have 9 dB loss. (Barring of course hardware differences that will move
those maybe a dB either way.)
So for 8 100W tx's, the theory gives you 12.5 W to the bottom of the
coax per channel. And other factors will likely add up to yield the 11W
that was mentioned.
--
Jim Barbour
WD8CHL
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