Balms maybe - RF transformers. But impedance matching
is still going on with various T, L, H, patterns.

Many have LNA's in them as well. I have a dual myself.
It is an active RF circuit you have to plug in. It downshifts
the frequency, combs out the noise, boosts the signal and then
impedance matches two outputs from a single input.

Many versions. Many of them are etch on substrates.

Martin

On 1/15/2013 6:21 PM, Michael A. Terrell wrote:

Martin Eastburn wrote:

Come on guys - internal components - even splitters have them -
resistors - they change values over temperature. In sensitive circuits
there are designs that compensate for this effect.


Good splitters have a multi-port transformer, not resistors.
Resistors waste too much power, You would lose 7 dB per output on a two
port splitter instead of 3.5 dB.