lxqqfy S-Horse QRP Kit 20-meter band User Manual

June 5, 2024
LXQQFY

lxqqfy S-Horse QRP Kit 20-meter band logo

lxqqfy S-Horse QRP Kit 20-meter band

lxqqfy S-Horse QRP Kit 20-meter band product

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 “LXQQFY.com“. It provide the WIFI module, with the mobile phone application communication. Support automatic key. Provide automatic sending function. Display sending sequential. Provide acrylic case.

 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

Circuit principle

Reference schematic diagram. Receiving part is the core of a NE602, inside it includes an oscillating circuit and 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 “di tick” 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.

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.

Production process

5.1 According to the list of components, check the n
ance -> Triode -> Crystal oscillator -> Bridge

lxqqfy S-Horse QRP Kit 20-meter band 01

Resistance.

lxqqfy S-Horse QRP Kit 20-meter band 02 lxqqfy S-Horse QRP Kit 20-meter band
03
Diode.
lxqqfy S-Horse QRP Kit 20-meter band 03 lxqqfy S-Horse QRP Kit 20-meter band
05
Variode
Capacitance.
lxqqfy S-Horse QRP Kit 20-meter band 05
104: 0.1uF 103: 0.01uF 33: 33pF 82: 82pF 474: 0.47uF 471: 470pF 473: 0.047uF|
Triode and FET.
lxqqfy S-Horse QRP Kit 20-meter band 07 lxqqfy S-Horse QRP Kit 20-meter band
07

Crystal oscillator.
lxqqfy S-Horse QRP Kit 20-meter band 09

LED.
lxqqfy S-Horse QRP Kit 20-meter band 10
Bridge rectifier.
lxqqfy S-Horse QRP Kit 20-meter band 10
Electrolytic capacitor.
lxqqfy S-Horse QRP Kit 20-meter band 10
Ic.
lxqqfy S-Horse QRP Kit 20-meter band 10 lxqqfy S-Horse QRP Kit 20-meter band
14 lxqqfy S-Horse QRP Kit 20-meter band
14
Inductance.
lxqqfy S-Horse QRP Kit 20-meter band 16

  • I-inductor
  • Color ring inductance

Magnet ring.

lxqqfy S-Horse QRP Kit 20-meter band 17

lxqqfy S-Horse QRP Kit 20-meter band 18 lxqqfy S-Horse QRP Kit 20-meter band
19


C2078.
lxqqfy S-Horse QRP Kit 20-meter band 20

Other.
lxqqfy S-Horse QRP Kit 20-meter band 21 lxqqfy S-Horse QRP Kit 20-meter band
21 lxqqfy S-Horse QRP Kit 20-meter band
21

  • DC Jack

  • Q9(BNC)

  • 3.5mm Socket(Key and Phone)
    lxqqfy S-Horse QRP Kit 20-meter band 24 lxqqfy S-Horse QRP Kit 20-meter band
25 lxqqfy S-Horse QRP Kit 20-meter band
26 lxqqfy S-Horse QRP Kit 20-meter band
27

  • Key

  • Pin

  • Jumper Cap

  • Variable resistor

WIFI Module.
lxqqfy S-Horse QRP Kit 20-meter band 28lxqqfy S-Horse QRP Kit 20-meter band
50

Install the acrylic case.
lxqqfy S-Horse QRP Kit 20-meter band 30 lxqqfy S-Horse QRP Kit 20-meter band
31 lxqqfy S-Horse QRP Kit 20-meter band
32 lxqqfy S-Horse QRP Kit 20-meter band
33

 Debug

  • The power before installation of dummy load.

Method 1:
lxqqfy S-Horse QRP Kit 20-meter band 34

Method 2:
lxqqfy S-Horse QRP Kit 20-meter band 34
Method 3:

lxqqfy S-Horse QRP Kit 20-meter band 34

  • 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.

  • Listen to the base noise: Connect the 8ohm headset, after power will hear a slight voice, then it’s normal.

  •   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.

  • 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.

  • 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.

Usage method

 Function diagram

lxqqfy S-Horse QRP Kit 20-meter band 51

 Key
  • Manual key Wiring diagram

  • Auto Key Wiring diagram

  • Using the most common 8ohm headset.

The antenna is the key of the shortwave station, Requirements: frequency 14MHz, impedance 50ohm, SWR <1.5. Recommend the following:
GP Antenna.
lxqqfy S-Horse QRP Kit 20-meter band 40

  • Red: Radio; Bule:: Feeder(50ohm); Violet: Fishing rod(9 meters); Yellow: Dummy grounds(9 meters); Pink:: Oscillator(10.1 meters);

Windom Antenna.
Winton antenna can be good to work in the three 40m/20m/10m band, the use of 1:4 Balun, according to the actual environment can have a variety of different installation methods.
lxqqfy S-Horse QRP Kit 20-meter band 40 lxqqfy S-Horse QRP Kit 20-meter band
42 lxqqfy S-Horse QRP Kit 20-meter band
43
DP Antenna.
The DP antenna is adopted skywave communication, long distance communication effect is very good, the use to 1:1 balun, usually V installation.
lxqqfy S-Horse QRP Kit 20-meter band 43

  • The use of WIFI Module and Mobile phone APP
  • Download Mobile phone APP from http://www.lxqqfy.com/.
  • Install WIFI module, circuit breaker JP1,power on.
  • Click on the “WIFI switch” button on the radio to open the radio WIFI hot spot (default WIFI closes)..
  • Open Mobile phone, connect WIFI, The name is ” LXQQFY****”,the password is “****”,”****” is 8 bit random number.
  • Open the APP, will be prompted to connect successfully. The status bar at the bottom of the screen will display the current state of the connection.

Run windows.
lxqqfy S-Horse QRP Kit 20-meter band 45

  • “D/D min”, “D/D”, “ILS min”, “Dot length” : All the parameters used to identify;

  • “D/D min” : The minimum ratio of dot length and dash length;

  • “D/D” : The standard ratio of dot length and dash length;

  • “ILS min” : Minimum length of word interval;

  • “Dot length” : The length of dot;
    Config Window.
    lxqqfy S-Horse QRP Kit 20-meter band 46

  • “Send speed”, ”D/D”, “Side tone”, “ILS”: All parameters used for automatic transmitter.

  • “PPT Mode”, “PPT send delay”: This parameter is useless in this state, do not choose.

  • “Manual Key”, “Auto Key 1”, “Auto Key 2”: Key work mode;

  • “F1”, “F2”: Automatic transmitter, “switch” used for conversion record mode;

No WiFi reference graph.
lxqqfy S-Horse QRP Kit 20-meter band 47 lxqqfy S-Horse QRP Kit 20-meter band
47 lxqqfy S-Horse QRP Kit 20-meter band
47

References

Read User Manual Online (PDF format)

Read User Manual Online (PDF format)  >>

Download This Manual (PDF format)

Download this manual  >>

Related Manuals