E-TECH Co., Ltd 1/16
▶ Table of Contents◀
1. Introduction
2. Description of Unit
3. Technical Specifications
4. Theory of Operation
5. Circuit Descriptions
Any changes or modifications to the equipment not expressly
approved by the party responsible for compliance could void
user’s authority to operate the equipment.
EP400 Ver. 1.0
E-TECH Co., Ltd 2/16
1. Introduction
EP400 has a compact size with a various features in the range of 403~520MHz. EP400
Has a various features shown as below.
EP400 constructed with a microprocessor controlled, temperature compensated Phase Locked
Loop(PLL) frequency synthesizer. The radio features a double conversion receiver and a direct FM
transmitter modulator. A special integrated circuit provides support to sub-audib le signaling(CTCSS & DCS)
and most of the receiving parts are switched off periodically in the power save mode to reduce battery current
drain during standby.
2. Description of Unit
Items Model
Radio EP400
Supplied
1700mAh Li-Ion battery pack
Package
External / Speaker Microphone
Accessories
Antenna
Desktop rapid charter
Adaptor
User manual
Items Model
Earpiece Microphone
Earpiece VOX Microphone
VOX & PTT Headset
EP400 Ver. 1.0
E-TECH Co., Ltd 3/16
3. Technical Specifications
3-1 General
1) Frequency range : 403 ~ 520 MHz
2) Channels : 255 Channels
3) Channel spacing : 12.5 kHz/25 kHz
4) Communication method : Simplex
5) Antenna Impedance : 50 ohm
6) Antenna : Helical Antenna
7) Power supply voltage : LI-1700mAh Li-Ion battery pack(Voltage: 7.4V DC)
8) Current Drain : When Transmitting(5W) - < 2A
When Receiving(0.5W) - < 300mA
Transmit standby - < 60mA
Receiver standby(PSC MODE) - < 50mA
9) Microphone : Internal Condenser Microphone(External Speaker Micro
phone is available)
10) Operating temperature range: -30 +℃∼ 60℃
11) Size : 55(W)x114(H)x30(D)
12) Weight : 300g
3-2 Transmitter
1) Power Output : HIGH – 4W, LOW - 1W
2) Modulation : 8K5OF3E/16KOF3E
3) Oscillator method : PLL
4) Frequency Stability : less than ±0.00025% (±2.5PPM)
5) Maximum frequency deviation: ±2.5 kHz(Narrow)/ ±5 kHz(Wide)
6) Audio Distortion : less than 5% (1 kHz 60%)
7) SPURIOUS Emission : -36 [dBm]
8) FM Hum & Noise : -40 [dB] (HP8920A 300Hz 3kHz BP∼ F)
9) BAND SPREAD : 117 [MHz]
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
Antenna
PTT
Monitor Button
KEY PAD
4)Emergency Key
Power ON / OFF
Speaker
Ear/Mic jack
LCD
EP400 Ver. 1.0
E-TECH Co., Ltd 5/16
4-1 Features & Operation
1. Monitor
Press the Monitor key momentarily to disable th e T one squelch.
2. Radio Call
By using Various 5Tone, in dividual / Group call is available.
16 Receiving codes are avai lable as well as open call.
3. Missed calls list
16 Missed calls can be listed. If a call remains unanswered, the call will be stored
by the radio.
4. contact list
During a call, the contact list may be used to give access to up to 16 preprogrammed
numbers accessed via the menu.
5. status list
A status is a code for transmitting prearranged messages, e.g. status “05” ma y indicate
“launch”. Status list contains up to 30 entries.
6. Channel : 255 channel
7. Scan ON/off
8. Power level : Power level is adjustable in each channel respectively.
9. Talkaround on/off
10. Emergency :
11. Lone Worker
12. Tx Tone select : In the menu, tx dcs /ctcss tone is adjustable.
13. Rx Tone select : In the menu, rx dcs /ctcss tone is adjustable.
14. Group : Defines group tone. You can select tone code for group, and it is used as a default value
. 0~9 and a, b, c, d available. And “A” is used as a basic value..
15. BEEP ON/OFF : BEEP sound ON/OFF.
16. KEY LOCK : LOCK/UNLOCK Button KEY.
17. SQUELCH : Squelch level is adjustable
18. AUTO SQUELCH : Squelch level is adjustable automatically by surroundings.
19. DTMF ON/OFF : DTMF function is available.
20. VOX : VOX LEVEL is adjustable by pushing up and down button.
21. AUTO VOX : VOX level is adjustable automatically by surroundings.
22. P - SCAN : Priority Scan
23. POWER SAVE : Power save mode is available.
24. PASS WORD : This function is useful for security reason.
25. LOCATION INDICATE : Indicate where the radio is located by blinking green light every 7 seconds.
26. SCRMABLE : Internal Voice Scrambler is available.
27. STUN / UNSTUN : For added security and to avoid abuse of the radio system in which you operate
a feature known as Stun/Unstun is included in your radio.
28. BACKLIGHT : Lamp is lighting when you check LCD status.
EP400 Ver. 1.0
E-TECH Co., Ltd 6/16
4-2 LCD Display and Icons
1.ANT GAZE ; Shows the received signal strength.
2.TX POWER HIGH: Indicate power level
3.KEY LOCK: Appears during key lock function is ON.
4.ALART(BEEP) ON/OFF: Appears when beep sound is turned ON.
5.Battery level indicator: Indicates reaming battery power.
6.VOX ON/OFF: Appears when VOX function is turned On.
7.SCAN: Appears when Scan function is activated.
8.SCRAMBLE: Appears while the voice scrambler function is activated.
9.TALK AROUND Indicator.
4-3 Features
1. Channel
This radio offers up to 255 channels
1). By using
2. Missed calls list
Up to 16 calls can be stored. If the same radio calls more than once, only the most recent call is stored.
When fifteen calls have been stored by the radio, depending on the radio programming the sixteenth call
received may overwrite the first or not be stored by the radio.
1).
2) Display shows
to enter Menu Mode.
button, you can select the desired channel.
3)
4)
5)
to select
or to scroll list
to exit
EP400 Ver. 1.0
E-TECH Co., Ltd 7/16
3. Contact list
1).
2) or to until
3)
4)
5) to exit
4. Status call list
4-1. Making STATUS call
1)
2)
to enter Menu Mode.
to select
or to scroll list
to enter Menu Mode.
or to until
3)
4)
5) Push PTT KEY for sending message on the LCD.
4-2 Make STATUS Message
1)
2)
3)
4)
5)
to select
or to scroll list
to enter Menu Mode.
or to until
to select
or to scroll list
to SELECT
EP400 Ver. 1.0
E-TECH Co., Ltd 8/16
5. Lone work
1).
2) or to until
3)
4)
6. Tx power
.
1).
2)
3)
4)
to enter Menu Mode.
to select
or to select ON/OFF
to enter Menu Mode.
or to until
to select
or to select HIGH / LOW POWER
5)
7. Tx Tone
Selecting Transmitting TONE(CTCSS/DCS).
1).
2)
3)
4)
0= NON TONE
1-38 CTCSS
101 – 183 DCS TONE
5)
to select
to enter Menu Mode.
or to until
to select
or to Select TONE을 either CTCSS or DCS.
to select exit
EP400 Ver. 1.0
E-TECH Co., Ltd 9/16
8. Rx Tone
Changing Receiving TONE(CTCSS/DCS).
1).
2) or to until
3)
4)
0= NON TONE
1-38 CTCSS
101 – 183 DCS TONE.
5)
9. Group
Changing GROUP Tone.
1).
2) or to until
to enter Menu Mode.
to select
or to select TONE either CTCSS or DCS.
to select exit
to enter Menu Mode.
3)
4)
5)
10. Beep on/off
1). to enter Menu Mode.
2)
3)
4)
5)
to select
or to select scroll list
to select exit
or to until
to select
or to select on off .
to select
EP400 Ver. 1.0
E-TECH Co., Ltd 10/16
11. Key lock
1). to enter Menu Mode.
2) or to until
3)
4)
5)
12. Squelch level
16 level is available. 0 = terminate sq function
1).
2)
3) to select
4)
5)
13. Auto Squelch
to select
or to select key lock /unlock.
to select
to enter Menu Mode.
or to until
or to the scroll list
to select exit
1). to enter Menu Mode.
2)
3)
4)
5)
14. Scan
1).
2) or to until
3)
or to until
to select
or to select on /off .
to select
to enter Menu Mode.
to scan.
EP400 Ver. 1.0
E-TECH Co., Ltd 11/16
4) Push PTT for exit
15. DTMF
1).
2) or to until
3)
4)
5) to select
16. Vox on/off
1). to enter Menu Mode.
2)
3)
4)
to enter Menu Mode.
to select
or to select ON /OFF.
or to until
to select
or to select ON /OFF.
5)
17. Vox Level
16 level is available..
1).
2)
3) to select
4)
5)
to select
to enter Menu Mode.
or to until
or to scroll list
to select for exit
EP400 Ver. 1.0
E-TECH Co., Ltd 12/16
18. Auto Vox
1). to enter Menu Mode.
2)
3)
4)
5)
19. Priority Scan
1).
2)
3)
4)
5) to select
or to until
to select
or to select ON /OFF.
to select
to enter Menu Mode.
or to until
to select
or to select ON /OFF.
20. Priority scan CH
1).
2)
3)
4)
5)
to enter Menu Mode.
or to until
to select
or to scroll list
to select for exit
EP400 Ver. 1.0
E-TECH Co., Ltd 13/16
21. Power save
1). to enter Menu Mode.
2) or to until
3)
4)
5) to select
22. Talkaround
1).
2)
3)
4)
5)
23. Password
to select
or to select ON /OFF.
to enter Menu Mode.
or to until
to select
or to select ON /OFF.
to select
1). to enter Menu Mode.
2) or to until
3)
4)
5)
to select
or to select ON /OFF.
to select
EP400 Ver. 1.0
E-TECH Co., Ltd 14/16
24. Password CH
1). to enter Menu Mode.
2) or to until
3)
4) ---- will display on the LCD( enter old password)
5) Enter new password by 4 digit.
25. Location
Indicate where the radio is located by blinking green light every 7 secon ds.
1).
2)
3)
4)
to select
or by pushing up and down KEY to change password.
by pushing enter KEY to change digit of password.
to enter Menu Mode.
or to until
to select
or to select ON /OFF.
5) to select
26. Scramble
1).
2)
3)
4)
5) to select
to enter Menu Mode.
or to until
to select
or to select ON /OFF.
EP400 Ver. 1.0
E-TECH Co., Ltd 15/16
27. Status call Send
1). to enter Menu Mode.
2)
3)
4)
5)
or to until
to select
or to select ON /OFF.
to select
EP400 Ver. 1.0
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