Features 1、High-performance 1.2GHz frequency counter based on for Microchip's 8-bit microcontroller PIC16F648A 2、The minimum step of intermediate frequency adjustable is 100Hz, the intermediate frequency range is 0~999.9999MHz, and it is set to plus or minus intermediate frequency mode 3、Built in frequency reference adopts temperature‑compensated voltage‑controlled crystaloscillator (±2.5 ppm VC‑TCXO) 4、Adopt dual intermediate frequency design, intermediate frequency value and plus/minus mode can be preset separately 5、LCD0802 LCD screen display, up to 7 digits can be displayed, and the frequency value of invalid zero is automatically blanked 6、Anti‑reverse power supply design, provide low‑power battery‑powered solution 7、Come with double button control, which possess good man‑machine interface 8、Various settings are automatically saved in EEPROM and directly recalled after power‑on Specification Item Type: Frequency Measurement Module Material: PCB Uses: Mainly used for DIY transceivers for frequency value display, and can also be used for regular frequency measurement Gate Time: 0.64s Measuring Range: 1MHz~1.2GHz Measurement Accuracy: ±100Hz Working Voltage: DC 9V~12V (with power reverse polarity protection) Working Current: Enable Backlight: <55mA Display Digits: The highest 7 digits display Frequency Reference: 13.000MHz temperature compensated voltage controlled crystal oscillator (VC-TCXO) in 5032 package, frequency stability is ±2.5ppm 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 Onboard Interface: RF INPUT (measurement signal input): XH2.54-2P square socket ICSP INPUT (MCU programming interface): XH2.54-6P pin POWER INPUT: XH2.54-2P square socket How to Use: 1. Please check the power supply voltage (DC 9V-12V) and polarity before use, and then turn on the power supply after confirming that it is correct. The machine has a fool-proof design, the power supply polarity is reversed, the machine will not work, but it will not produce destructive consequences. 2. The measurement signal input is connected to the test line (wired method) or antenna (induction method) with the 2P square socket. 3. Turn on the power of the instrument to warm up for a few minutes and wait for the frequency reference to stabilize before performing measurement operations. Package List 1 x Module 2 x Connection Line