Tip: This microcontroller uses Atmega8A, not the original STM32F103C8T6
Note: Again, this product's circuit board drawings and the underlying source code of the single chip computer are free. Whether you buy or not, Ali Wangwang left me a message & ldquo; free information & rdquo; and sent the compressed production data to you through Ali Wangwang (the most convenient method I can find at present), for your reference, exchange and self-research. We will produce, magic change, research and development of better products, Taobao to achieve sales, to meet high-end players. Don't question your hands-on ability. Think about the discovery of Uranus by William Herschel's home-made telescope, which polished lenses more than 200 years ago. Galileo's telescope was also made by himself.
Because there are two high frequency oscillators (tracking source oscillator and spectrum local oscillator) on the circuit board of this product, it is unavoidable that they interfere with each other when they work at the same time (especially because the microwave band of the board size 99x75 is over 1500mhz has begun to appear). Simple shielding to reduce this interference effect is very small, do not. Close the structure with a metal enclosure (after all, a prop on your mage's path). Of course, it's feasible for you to redesign the available metal shell structure rationally. After all, radio enthusiasts'brain holes and hands-on abilities are unlimited.
Friendship reminder: For curious amateurs who like to use their hands and brains, tens of megabytes bandwidth sweeper may be a better choice. It is really important to have a good command of the high frequency characteristics of the basic L and C, and to have an intuitive feeling. It is also the basis of understanding the higher complex applications. At the same time, it is also the key basic instrument for all designers to design and select materials. It is by no means a substitute for the common multimeter to measure inductance and capacitance. Because their high-frequency parameters are sequences, functions for frequencies, curves, and not just a few dry numbers.
Sweep type simple spectrum D6m8 V3.01B version handmade small production
Property: RF frequency domain analysis tool
Interface: usb
Power supply: usb
Standby current: ≤80mA
Sweep frequency current: ≤350mA
Sweep frequency bandwidth: 35mHz---3000mHz
Turn on the tracking source output bandwidth 35mhz---3000mhz
Frequency sweep step: ≥ 35~68.75mHz/125Hz, 68.75~137.5mHz/250Hz, 137.5~275mHz/500Hz, 275~550mHz/1kHz
550~1100mHz/2kHz, 1100~2200mHz/4kHz, 2200~4400mHz/8kHz,
Sweep frequency: ≥500 points/sec
Sweep frequency dynamic logarithmic ratio:> 50dB
Point frequency or sweep frequency output power: ?-3dBm
Input detection: ≤10dbm
Background: ? -50dBm
Computer side software: NWT4.11.09 version
Computer operating system: winxp, win732, win764, win1032
Purpose: To measure frequency, do simple amplitude-frequency characteristic analysis of transmission network.
Core components: ATMEGA8A microcontroller. The output of adf4351 is a rectangular wave, and the amplitude becomes the trigger level. IAM81008, the mixer chip, uses the domestic ps3120 to supply power. IAM81008 is a vulnerable part and is easy to break. ad8307, power logarithmic detector.
ch340e, the domestic USB to ttl chip, ch340e is extremely cost-effective.
Working principle and concept: difference frequency scanning, low pass (RBW) 200khz.