Com-Power model PAM-103 Preamplifier is intended for improving measurement system sensitivity during EMC compliance testing.. It has a frequency range of 1 to 1000 MHz.. It has gain of 33 dB gain . Therefore, It amplifies the signals that were previously hidden below the noise floor of the EMI receiver so that it can be seen and measured. The PAM-103 has a gain variation of ±3 dB for the entire frequency range to reduce measurement errors. It can be powered by the rechargeable NimH batteries included when an external power source is not available.