It appears that your amplifier is doing what you should expect. An amplifier's power handling capability, compression point, etc. are rated based on amplification of a single sinusoid. When multiple signals are present at the amplifier input, the total output power of the amplifier does not change, hence the power available per channel decreases as the number of input signals increases.
Also, since multiple independent signals will combine randomly, crest factor issues further decrease the available power per channel in order to keep the amplifier output below clipping. This is a common issue in the design of signal enhancement products such as BDA's used to provide coverage extension for trunking and cellular radio systems. ------------------------------------------------------------------ --- In [email protected], Kent Chong <[EMAIL PROTECTED]> wrote: "All three amplifiers are connected in series. I shall correct my statement: in the lab, we get 0dBm output on the last stage of amplifier. However, when we are at the site, it max at -24dBm (it is - ve, sorry). There is no difference in the configuration but number of channel."
