AM broadcasting is a radio broadcast conducted using AM mode. Amplitude modulation is a modulation method that maintains the frequency of the carrier wave unchanged and changes its amplitude according to the changes in the transmitted signal. It is used for long wave, medium wave, and short wave broadcasting. Its advantage is stable transmission over a large range, without signal distortion caused by multipath reflection; The occupied frequency band is relatively narrow (only about 10 kHz), which can accommodate a large number of broadcasting stations in the medium wave, short wave and other frequency bands; The receiver is relatively simple and widely used. The disadvantage is that the carrier frequency is low, susceptible to interference, and the sound quality is not as good as FM broadcasting. Canadian physics professor Fessenden invented AM radio in 1906
Function of testing report:
1. Project bidding: Issue authoritative third-party CMA/CNAS qualification report
2. Online e-commerce platform entry: Quality inspection report recognized by major e-commerce platforms 3. Used as a sales report: issuing legally effective testing reports to make consumers more confident 4. Papers and research: Provide professional personalized testing needs 5. Judicial services: providing scientific, fair, and accurate testing data 6. Industrial problem diagnosis: Verify the troubleshooting and correction of industrial production problemsBaijian and testing process:
1. Telephone communication and confirmation of requirements
2. Recommend solutions and confirm quotations 3. Mail samples and arrange testing 4. Progress tracking and result feedback 5. Provide reports and after-sales service 6. If urgent or priority processing is requiredTesting and testing characteristics:
1. The testing industry is fully covered, meeting different testing needs
2. Fully cover the laboratory and allocate localized testing nearby3. Engineers provide one-on-one services to make testing more accurate
4. Free initial testing, with no testing fees charged
5. Self service order delivery for free on-site sampling
6. Short cycle, low cost, and attentive service 7. Possess authoritative qualifications such as CMA, CNAS, CAL, etc 8. The testing report is authoritative and effective, and is generally used in China