PLJ-0802 Embedded intelligent frequency meter designed specifically for amateur frequency measurement instruments. 
Its small and exquisite, simple, reliable, mainly for DIY transceiver for frequency value display, can also be used for conventional frequency measurement. 
 
Micro chip's 8-bit microcontroller PIC16F648A as the core of the high-performance 1.2GHz frequency meter.
Built-in frequency reference using temperature compensated voltage-controlled crystal oscillator (± 2.5 ppm VC-TCXO).
Dual IF design, IF and add / subtract mode can be individually preset.
LCD0802 LCD screen display, up to 7 digits can be displayed, the frequency value is invalid zero automatic blanking.
Anti-power reverse design, low-power battery-powered programs.
Double-button control, good man-machine interface.
The settings are automatically saved, the next boot directly call.
 
Technical Parameters:
 
Gate time:0.64 sec
Measuring range: 1 MHz to 1.2 GHz
Measurement accuracy: ± 100Hz 
Channel Sensitivity: (HM8134-2 data) 
Test Frequency (MHz): 5 10 30 60 100 150 200 300 450
Sensitivity (mV RMS): 35 20 10 3 3 4 8 15 12
Test Frequency (MHz): 500 550 600 700 800 900 1000 1100 1200
Sensitivity (mV RMS): 14 30 65 80 80 35 175 270 310
Operating voltage:DC input: DC 9V ~ 12V (reverse polarity protection with power supply)
Operating current:Enable backlight: ≤ 55 mA
Display digits:The highest 8 digits are displayed
Physical dimensions:Length × width × height: 58mm × 32mm × 27mm
 
IF settings:IF adjustable minimum step of 100 Hz, the range of 0 to 999.9999 MHz, can be set to increase the IF or reduced IF mode.
Frequency reference:The 13000-MHz temperature-compensated voltage-controlled crystal oscillator (VC-TCXO) in a 5032 package has a frequency stability of ± 2.5 ppm. 
 
Onboard interface:
 
RF INPUT (measurement signal input): XH2.54-2P square mouth socket 
ICSP INPUT (MCU programming interface): XH2.54-6P pin 
POWER INPUT (power connector): XH2.54-2P square port socket
 
Package List:
1* PLJ-0802-E frequency counter meter