E-Tech EP400 - Theory of Operation

EP400 Ver. 1.0
E-TECH Co., Ltd 4/16
3-3 Receiver
1) Receiver Type : Double Super Hetero type
2) Sensitivity : -0.25uV e.m.f ( 12dB SINAD )
3) Frequency Stability : ±0.00025%(±2.5PPM)
4) SPURIOUS Rejection : -70 dB
5) Adjacent Channel Selectivity: -60 dB (Narrow) , -70 dB (Wide)
6) Distortion : 5% (1 kHz 60%)
7) Hum & Noise : -40 dB(HP8920A 300Hz ∼ 3kHz BPF)
8) Audio output : 1000 mW
9) BAND SPREAD : 117MHz
10) Speaker size : 45 pi
4. Theory of Operation
EXTERNAL VIEW
4)Emergency Key
Antenna
PTT
Monitor Button
Ear/Mic jack
Power ON / OFF
KEY PAD
LCD
Speaker