mfj-299 microphone and equalizer:
specifications
s/n ratio: 80db
distortion factor: 0.05% (at flat)
graphic equalizer: 4 elements (270, 540, 1000, 2000 hz) + 12 db range
output voltage: comp 0 - 30mv (rms)
matching output impedance: 500 ohms
current consumption: 11ma maximum
alarm sound: approximately 4.5 khz
呵呵,看了mfj-299的输出数据后我发现真得做个调音台和电台之间的匹配衰减器!