[HomeBrew] 50 ohm receive splitter

[To Possibilities]

[[The "good old" TV type splitter is only three resistors.....  each one
third the impedance.....  for the 75 ohm circuit, they are 24 ohms.
Result is a 3dB reduction in each port, and good to 900 MHz.

What additional benefit is gained by using a transformer splitter?]]

In RF/microwave circuit design, when there are needs of splitting one 
signal power into two branches over a wide frequency band while the loss 
is somewhat tolerable, a resistive three-port network can be employed.

Resistive power dividers are easy to understand, cheap, can be made very 
compact, and are naturally wideband, working down to zero frequency 
(DC). Their down side is that a two-way resistive splitter suffers 3 dB 
of real resistive loss, as opposed to a lossless splitter like a hybrid. 
Accounting for 3.02 dB real loss and 3.02 dB power split, the net power 
transfer loss you will observe from input to one of two outputs is 6.04 
dB for a two-way resistive splitter.

For some of applications where loss is critical such as power amplifier 
combiners, the extra loss of a resistive splitter is an unacceptable 
compromise.

For the resistive divider, one half of the power that flows through it 
is wasted in the resistors. For example, a one watt signal at port 1 
will result in two quarter-watt signals at ports 2 and 3 (down by -6 
dB). Because of the loss within the network, you have to carefully 
consider the power dissipation and resistor power ratings.

Another disadvantage it the none of the ports are truly isolated from 
each other. The isolation of a resistive splitter is equal to its 
insertion loss.

Ed, W1AAZ

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http://mysite.verizon.net/topossibilities/