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RF Attenuator Digital

In order to measure easier the response curve of RF modules I bought this 0.5 dB step digital attenuator. See the picture on the right.

The 30 dB version is the best buy, to measure up to 2.4 GHz. Now there is a new updated version with 0.25 dB stepping, see at the links.


There are 3 Models:

The Features are:

  1. the operating frequency: LF - 3 GHz
  2. the attenuation adjustment range (Model): 0-30 dB, 0-60 dB, 0-90 dB step
  3. the attenuation step: 0.5 (dB)
  4. insertion loss: ≤ 3.5 dB
  5. standing wave ratio: ≤ 1.4
  6. Attenuation accuracy: ± 1 dB max.
  7. Rated input power: 1 W = 30 dBm
  8. Connector type: SMA
  9. Temperature range: -10 ℃ ~ +50 ℃ (operation) -40 ℃ ~ + 70 ℃ (not running)
  10. Overall dimensions: 55 X 40 X 16.5mm
  11. Weight: 57g
  12. Input and output impedance: 50 Ohm
  13. The attenuation value is stored in EEPROM (found out)


The operation:

Remote Control (corrected):


After opening the housing, I realized that the labels of the IC's was sanded off. See the photo above.

Fortunately there are only some attenuator IC's on the market. When you search the internet for PEREGRINE_HF-Switch-PE4302_EN.pdf you will find the data sheet. There is also a second source F1912 from company Renesas. Because of the 10 KOhm resistor on pin 3 it could be only the PE4302, see page 5 of the data sheet.

/!\ Considering that, it makes only sense to buy the 30 dB version. If you need more attenuation add fixed value attenuators.


At the maximum attenuation of 31.5 dB, you have an Attenuation Error at 2.4 GHz of about 1 dB. See the data sheet for more details.

The 30 dB version is the best buy, if you measure above 500 MHz.

Now there is an updated version (0.25 dB step) on the market, probably with the IC PE43703, see at the links. This IC is now obsolete and replaced by the IC PE43713.

  1. aliexpress.com, 3G digital program-controlled attenuator 30DB 60DB 90DB step 0.5DB OLED display

  2. Datasheet PE4302

  3. 6G digital programmable attenuator 30DB stepper 0.25DB OLED

  4. dBm-Watt-Voltage table

  5. dBm Voltage calculator

  6. dBm to Watt calculator

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-- RudolfReuter 2020-05-26 17:52:29

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RF-Attenuator-Digital (last edited 2020-07-01 16:52:54 by RudolfReuter)