g86
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Gemini1706 said:"whre people use arbitrary length transmission line to connect 2 sources."
Gemini1706 said:Just wanted to mention that if you are combining to 'different sources' as I understood from your comments above, then there is no way to combine them in phase at all, since the sources are different and carry different phase info...etc.
Gemini1706 said:The only way to acheive max combining gain is if the two signals combined are 100% identical in phase, shape, transmitted info..etc. This usually is true if you have just ONE source of signal, then you SPLIT this source with a splitter, then try to combine them back again (maybe after amplification) with a combiner. Only then you need to worry about phase matching the two signals in the combiner.
If you have two different sources (as an example two HP signal generators) there is no way to combine them with combining gain unless they are transimitting the same info, and they PHASE-LOCKED together, not just frequency locked.
flatulent said:There is no way to combine them without loss of some form.
Semiconductor gain is cheap. Take your 6 dB loss in the passive combiner.
In some situations isolation is the main concern. For instance, in combining two signals to measure IMD. The leveling loops of a signal generator will remodulate spurious sidebands onto its signal if the other signal is put into the output by the nonideal isolation of the combiner.
g86 said:the information contained at two input may also can be lossed or distorted during these type of addition.
RF is [Really Funny]
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