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DC-4.0GHz RF Fixed Attenuator Radio Frequency Fixed DC-4.0GHz RF Fixed Attenuator Radio Frequency Fixed ₹1,026.86 View It
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Top Positive Review for %s on Banggood, Shop best %s with lowest price on Banggood. Browse most helpful positive review for %s before you buy., rc toys, fun sports, fashion, popular electronics
HughT 22/02/2021
This seems to be a good idea for a product but there were definite quality issues. One of the SMA connectors was deformed and had to be bent straight to avoid damaging connectors by forcing them on. None of the ground connections of the SMA connectors was soldered - only the signal pins. This means that the ground connections were made just by the ground tabs being held against the PCB. The 10dB attenuator is a PI network but the top resistor is made up of two different valued resistors to keep them in the E12 series. This is not a good idea as the added inductance degrades high frequency performance. The 20dB attenuator is two 10dB PI networks cascaded with the two parallel resistors in the middle combined into one so that the total network is M shaped. Again the resistors in the two sections are slightly different to allow E12 values but in this case the high frequency impact shouldn't be as severe. The 30dB attenuator is a similar to the 20dB one in having the five resistors in an M shape but it isn't made up of two PI networks. It just seems to be a combination of resistors that gives approximately correct input and output impedance and attenuation. The first section has a much lower attenuation than the second. So, overall the design is acceptable for many uses but the production quality is poor.
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  • Banggood Dear Customer,Thank you for choosing Banggood and sorry for the inconvenience caused.In order to provide the best solution, if you have any questions about the product, please do not hesitate to contact us for a help by filling out the form at below links: Personal Computer: http://www.banggood.com/Contact-Us_hi111Mobile: https://m.banggood.com/contact_us.html We will reply and offer you the best solutions after confirming the case within 24-48 hours. Best regards,Banggood Team

    21/05/2024
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