Venus Litelink User manual

Litelink
Radio audio/digi interface
UUSER MANUAL
Venus Information Technology Co., Ltd

Caution
Although this product uses certain isolation, your
computer/radio/other terminal may still be damaged.
Please ground the equipment.
Caution
In order to reduce the development cost and ensure the health of the
owner, this product has been using lead-free circuit boards, lead-free
solder, rohs-compliant washing liquid and inexpensive connectors
since January 2018. This product complies with RoHs standards. If
you are located in an EU member state or other countries, please do
not hesitate to contact me to produce customized products that
meet your relevant standards.
Caution
Venus Info Tech. is not responsible for equipment damage caused by
this product.
Caution
The use of this product requires a certain degree of electrical
operation, as well as the English reading ability of related software.
Because this product is very cheap, it does not provide all software

remote assistance.
Caution
This product contains chemicals such as Pb and Sn. Please keep it in a
safe place and keep it out of reach of children. If you have any food,
please contact the local fire department immediately.
NOTICE
This product cannot directly control the frequency of the radio (CIV
of ICOM, CAT of YAESU, etc.).
Part Name
Hazardous Substances
铅(Pb)及其
化合物
Leadand
its
compound
s
汞(Hg)及其
化合物
Mercuryan
d its
compound
s
镉(Cd)及其
化合物
Cadmium
and its
compound
s
六价铬(Cr
6+)化合物
Hexavalent
Chromium
compound
s
多溴联苯
（PBB）
多溴二苯醚
（PBDE）
PCB
○
○
○
○
○
○
resistance
○
○
○
○
○
○
cap
○
○
○
○
○
○
transformer
×
○
○
○
○
○
Connector
○
○
○
○
○
○
Package
○
○
○
○
○
○
Product introduction
Lite link is a mini version of the radio audio interface. Unlike most interface on
the market, the lite link has a PCB size of only 5*5cm. The following is the
difference between litelink and other products.
1. The price is very cheap, the price can only buy a USB-COM cable
(If you go to the electronics market and don't know how to do it, you will be
pitted)
2. Provides a 4-ring stereo jack for easy connection to hardware
(You can directly use the 4-ring male-to-public connection single-interface
computer, as well as mobile phones, Android or other tablet devices)
3. With TTL write frequency interface
(The TTL write frequency interface is provided in the upper right corner of the
board, which is convenient for you to write to GP88)

4. With DIY radio interface
(The 4P XH2.54 interface is provided in the lower right corner of the board,
which is convenient for you to use for strange radio stations.)
Litelink uses common interface cable
USB uses a TYPE B USB cable.
Audio can choose 4 ring stereo male to male connector to connect the link to a
laptop, smart phone, tablet device with only one audio interface, and also
provides a common audio interface input , just use 3 ring ordinary stereo The
male to male connector can be connected to the hardware.
The output of the radio adopts the PS/2 interface. The PS/2 interface is the
most commonly used data channel for the UV radio station and the short-wave
radio.
In order to improve the use value of litelink, link also provides a CW interface
for daily CW use, as well as a set of TTL write frequency interfaces, a set of
DIY radio interfaces.
What can I do with lite link?
1. Connect to the U/V radio to run software such as ECHOLINK,APRS.
2. Connect to HF radio to run software such as RTTY/SSTV/FT8/PSK
3. Use TTLinterface to write to GP88S and other radios
4. CIV connecting ICOM stations using TTL interface
5. Connected to an HF radio for transmitting CW signals
6. For radio and mobile phones, tablets and other devices connected to run
APRS / RTTY / SSTV / FT8/ PSK and other software, and use the OTG cable
to connect to the USB serial port (or use VOX voice control)
Where does the computer driver needed for
Litelink?
Litelink uses CH340G produced by WCH as the serial port chip. The driver for
this chip is recommended to go directly to the WCH.CN official website for
download. If you use other channels to download the driver, the computer may
not be able to shake hands with litelink.

The signal that the radio sends to the
computer/mobile terminal can be adjusted using
Blue small block (3296 potentiometer)
Litelink PCB
2
1
3 4
5
6
7 8
9
Wiring instructions
1 Type-B USB is used to connect to a computer, or connect to other
mobile terminals via OTG adapter cable
2 XH2.54TTL write frequency (CIV) interface, pin definition from left to
right is GND / +5V / TX / RX
3 3-ring stereo audio jack for connecting to the microphone of the

computer
4 PS2 6-pin connector for connecting stations with this data interface
5 3-ring stereo audio jack for connecting to the computer's speaker
6 3-ring 3.5mm jack for connecting the radio's straight key for
computer transmission
7 4-ring stereo audio jack for connecting computers and mobile
phones with this interface, or other terminals
8 XH2.54 custom radio interface, the pin definition moves from left to
right in order of GND/SPK/PTT/MIC
9 Grounding
Serial port control instructions
PTT VIA RTS CW VIA DTR

Lite link schematics

LiteLink Component list
Part Value Device Package Library Sheet
C1 10uF 10UF-25V-20%(PTH)KIT CPOL-RADIAL-10UF-25V-KIT SparkFun-Capacitors 1
C2 104 C-EUC0805 C0805 rcl 1
C3 103 C-EUC0805 C0805 rcl 1
C4 22p C-EUC0805 C0805 rcl 1
C5 22p C-EUC0805 C0805 rcl 1
C6 225 C-EUC0805 C0805 rcl 1
C7 225 C-EUC0805 C0805 rcl 1
C8 102 C-EUC0805 C0805 rcl 1
C9 683 C-EUC0805 C0805 rcl 1
C10 102 C-EUC0805 C0805 rcl 1
C11 225 C-EUC0805 C0805 rcl 1
IC6 CH340G CH340G SO16D mylibraries 1
JP1 USB-B USBPTH USB-B-PTH SparkFun-Connectors 1
JP2 M04LONGPADS 1X04_LONGPADS SparkFun-Connectors 1
JP3 M04LONGPADS 1X04_LONGPADS SparkFun-Connectors 1
OK1 CW PC817 DIL04 optocoupler 1
OK4 PTT PC817 DIL04 optocoupler 1
R1 330R R-US_M0805 M0805 resistor 1
R2 560R R-US_M0805 M0805 resistor 1
R3 4k7 R-US_M0805 M0805 resistor 1
R4 1k R-US_M0805 M0805 resistor 1
R5 470R R-US_M0805 M0805 resistor 1
R6 1M R-US_M0805 M0805 resistor 1
R7 330R R-US_M0805 M0805 resistor 1
R10 R-TRIMM3296W RTRIM3296W rcl 1
U$1 PCMIC PJ-313-D PJ-313-D PJ-313 1
U$2 PS/2 MINI-DIN6PTH MINI-DIN6 SparkFun-Connectors 1
U$3 PCSPK PJ-313-D PJ-313-D PJ-313 1
U$4 CW PJ-313-D PJ-313-D PJ-313 1
U$5 TR5_1 TR5_1 TR5_1 mylibraries 1
U$6 TR5_1 TR5_1 TR5_1 mylibraries 1
U$8 PHONE PJ-327-E PJ-327-E PJ-313 1
Y1 12MHZ CRYSTALSMD HC49UP SparkFun-FreqCtrl 1

Litelink test environment
Each Litelink will be tested before packaging. The test equipment is
FT-8900R, power 5W, using GP antenna to test the USB and audio parts
of litelink (using ECHOLINK software). In the development process, the
ICOM7100, long-line antenna was used to test the CW function.
[e-mail]