Assembled S-Horse QRP HAM RADIO 20m CW QRP TRANSCEIVER - PIXIE II 14,060 KHz

Description

Assembled S-Horse QRP HAM RADIO 20m CW QRP TRANSCEIVER - PIXIE II 14,060 KHz
Description
Note : this item is assembled board  ,  not inclued  wifi module
1. Introduction
This is a very small volume of simple 20 meter band micro-power amplitude telegraph
transceiver, Despite it's small size and DC receiver limitations, it is capable of working
several hundred miles when connected to a good 20 meter antenna. Designed by
. It provide the WIFI module, with the mobile phone application
communication. Support automatic key. Provide automatic sending function. Display
sending sequential. Provide acrylic case.
2. Specifications
Power supply: 9~13.8 Volts DC, >500mA (Recommend the use of batteries)
Antenna: 50ohm, 14MHz, SWR<2.0
Receive: static current 50mA
Transmission power: 2W
Frequency: launch the vibration frequency, 14.060MHz
Receives the local oscillator frequency: about 14.060-14.090MHz
Work mode: the CW
KEY: Manual and automatic auto-detection
Automatic sending: ok
Config: the mobile phone application(WIFI)
Case: acrylic
3. Circuit principle
Reference schematic diagram. Receiving part is the core of a NE602, inside it includes
an oscillating circuit an a balanced mixer, antenna in the signal after a crystal filter, into
the mixer, oscillation circuit at the receiving frequency oscillation, two signals through mixing,
directly put the CW signal frequency conversion for audio,NE602 output again gave
LM386 audio amplifier, thus complete the receiving process. Circuit consisting of Q4 audio oscillator
to produce about 700Hz sine wave side tone,LM386 amplification, make the headset
with "ditick" audio transmission. Launch part using the NE602 oscillation circuit, and then to Q6 do
the buffer amplifier, at the end of the class is made up of class C C2078 amplifier, after
amplification of the high frequency signal after LPF filtering antenna.
The WIFI module is optional. If you do not use the WIFI module, you need to short circuit
the JP1, then "S-Horse" == Ordinary CW radio. If you use the WIFI module, you need to
unplug the JP1, then you can use the mobile phone configuration data.
4. Component selection
8050 magnification is about 130, C2078 magnification is about 200. L4 is HFC, ferrite
beads in FT37-43 (black) to use the 0.5mm enameled wire around 8 times. L5 is the high
frequency filter inductance in T37-2 on the iron core is circular and (red) using 8 to 0.5 mm
enameled wire around.
Inductance is a fixed inductance (outsourcing black heat shrinkable casing).Other
devices, such as 0.47uf for monolithic capacitors, more than 10uf capacitance for
aluminum
electrolytic capacitors, all resistance is a quarter w fixed resistance.
5. Production process
5.1 According to the list of components, check the number of components. Have tools,
Electric iron, Solder wire, and A multimeter on hand. Take welding from low to high
order,Recommend: Resistance -> Diode -> Capacitance -> Triode -> Crystal oscillator ->
Bridgerectifier -> Electrolytic capacitor -> Ic -> Inductor -> Magnet ring -> C2078 -> Other.
6.2 Power on: Do not distinguish between positive electrode and negative
electrode(Internal rectification), Recommend the use of battery, Can also use the DC linear
voltage stabilized power supply. If power on after tens of seconds without abnormal
heating,then it's normal.
6.3 Listen to the base noise: Connect the 8ohm headset, after power will hear a slight
voice, then it's normal.
6.4 The receiving circuit test: If connect the antenna to hear the voice and do not connect
the antenna to hear the voice of a great difference,then it's normal.
6.5 The sending circuit test: Connect dummy load, don‘t install WIFI module, short circuit
JP1, connect the key, and power on. Now you can use the key control to send, Static
current:40~100mA,Sending current:400mA, In the sending state under the virtual load
will be fever. Note: it is not a long time to send.
6.6 The WIFI module test: Connect dummy load, install WIFI module, circuit breaker JP1,
connect the 8ohm headset, connect the key, and power on. Click “WIFI button” to open a
WIFI connection, would you hear "ka ka" sound, then WIFI is opened. Download the APP
from the www.lxqqfy, using APP to connect the WiFi module to communicate.
package：
1pc  DIY KIT  S-Horse QRP Kit HAM RADIO 20m CW QRP TRANSCEIVER  - PIXIE II QRP KIT 14,060 KHz
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