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− | [[File:RF_Atten-Front-01.jpg]]
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− | [[File:RF_Atten-Rear-01.jpg]]
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− | == Features ==
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− | * This is a [http://www.west-l.com/uploads/tdpdf/yqperegrine_hf-switch-pe4302_en.pdf PE4302] numerical control RF attenuator module.
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− | * The parallel immediate mode is simple and easy to use.
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− | * Bandwidth is wide and can be 1MHz to 4GHz.
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− | * Program control gain attenuation range is from 0 to 31.5DB.
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− | * The module supports parallel port and serial port mode as well as power on state selection function.
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− |
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− | === Specifications ===
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− |
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− | * Power Supply Voltage
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− | ** 2.7-3.3 VDC - 3V typical
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− | ** Typical current 5mA
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− | * Program control gain attenuation range
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− | ** 0~31.5DB
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− | ** 10K pull down resistors to ground
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− | ** Digital Input High 0.7xVDD in V = 2.1V
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− | ** Using 1.5K pullup with 18K pulldown = 2.6V
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− | * Stepping: 0.5DB
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− | * Input/Output Impedance
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− | ** 50 ohm
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− | * Bandwidth
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− | ** 1MHz~4GHz
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− | ** Attenuation value will differ under different frequency
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− | * Max Input power (50Ω) +30 dBm (1W = 7.1V RMS)
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− | * Connectors
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− | ** SMA-female
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− |
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− | == Control Board ==
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− |
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− | * A lot of designs using an Arduino/OLEDS, etc to control the card
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− | ** Unnecessary
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− | *** Could add noise from OLED
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− | *** Doesn't need to switch too often
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− | * Use [[SWLEDX8]] to control attenuation selection
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− | * Use center 6 switches
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− | * Mount in small extruded metal project box
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− | * [[Mini360 Adapter Board]] for broad input voltage range
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− | ** Concern over EMI?
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− | [[file:SWLEDX8-I2C-P118-720px.jpg]]
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− |
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− | == References ==
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− |
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− | * [https://kv4qb.blogspot.com/2019/04/63-db-step-attenuator.html DuWayne's Arduino based attenuator]
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− | ** Hackaday project page
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− | * [https://www.psemi.com/products/family/rf-attenuators Peregrine Semiconductor's page] - Chip maker
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− | * [https://github.com/tswfi/PE4302_Attenuator PE4302 tswfi] - Simple attenuator built with PE4302 and Arduino "pro micro".
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− | ** [https://github.com/tswfi/PE43xx PE43xx Arduino Library]
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