Finding hope in despair

RF-刘海石

Finding hope in despair [Copy link]

 

Finally, the project was completed and is being tested by the customer. This project lasted for 4 months. It started in mid-December last year and was finally completed in early April.

A customer in Beijing needed to make a pDDL900 amplifier through a friend's introduction. The original amplifier was from a foreign manufacturer (which was expensive), and the customer wanted to replace it. So we developed this.

During this period, we worked on 5 versions, and improved them one by one, and finally finished it after 5 versions. This module is a broadband data and image transmission module, mainly used for projects such as drones. The communication mode can be QPSK\16QAM\64QAM, etc. The bandwidth is 2MHz, 5MHz, 8MHz. This module is different from the previous P900.

pDDL900 module.

I made the P900 amplifier when I was in the company before, which is completely different from the amplifier of this module. From the detection to the power amplifier, the switches on the front end are basically different.

There were five versions in succession, and I had to optimize and improve them step by step. During this period, I felt desperate. Sometimes I didn't know where to start. Customer feedback, various problems, network failure, packet loss, data not working, and various terms made me confused. However, after exploring little by little in despair, I finally saw hope.

Here are some pictures tested:

LNA gain, 902MHz---928MHz

Channel power, use the instrument to simulate QAM signal, test the power amplifier, output 10W

Help customers to run data

Retrieve the parameters of the pDDL900 module

Final delivery to customers

To sum up, I felt desperate and wanted to give up countless times during this period. I was most afraid of customers calling me every day. Every time I saw a customer calling me, I felt desperate. But I managed to get through it, slowly figured it out, and finally figured it out. So I advise everyone to persist when you encounter problems in the future, and don't give up easily. Hope is often found in despair.

nmg

UUC

Like it!

chenbingjy

sharp

swustlx86

Awesome! Like it

okhxyyo

Great!! Yes, dawn comes after darkness~~

hahajing

It is a good growth experience for individuals, and the income is also good.

ddllxxrr

Thank you for your hard work. It reminded me of what I learned in my English textbook: DOn't Give UP!

qwqwqw2088

Like, hard work pays off!

yhgwork

Brother Liu, how much does it cost to buy two network points? Isn't it a bit redundant? For such a project, you should sell it at a higher price to him, and don't give him the information. Just supply the goods to the customer.

RF-刘海石

yhgwork posted on 2020-6-3 01:01 Brother Liu, how much did you buy the two network points? Wouldn't it be a bit redundant? For such a project, you should sell it at a higher price to him, and don't give him the information. Just supply the goods to the customer...

Hello, I only have one network splitter and one N9020 spectrum analyzer.