> "FHS" <[EMAIL PROTECTED]> wrote:
> Gentlemen:
> I guess I will add my 2 cents worth here. In a two Tx
> Ferrite Hybrid combiner each Tx will have at least one
> ferrite isolator and some times three between the TX
> and the combiner.
Min typical spec should include 2, although 1 is common.
> For a two Tx combiner there will be approximately 3.5 db
> loss for each Tx. When increasing to a four Tx combiner
> you will combine two groups of twoTx's, split the power
> again and add some additional losses for approximately
> 7.0 db loss for each Tx. And so, with an 8 Tx combiner
> you combine two groups of 4 together for an additional
> 3.5 db loss for each Tx or a total of approximately 10.5 db
> loss to each Tx in the 8 Tx combiner.
right on the money...
> In addition a low pass filter will be in the combiner
> output adding another few tenths of a db loss to each
> Tx. Also, if the frequency separation between the Tx's
> is great, there will be some additional losses.
> I have typically measured 8-9 watts per Tx on a close
> spaced system at the output of an 8 Tx combiner on UHF.
> If you get 11 watts at the antenna per Tx consider it
> a great system.
> Fred W5VAY
And you can feel good about results while the room heats
up. But sometimes it's your only option. 100 watts in
for less than 10 out.
cheers,
skipp
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