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amplifiers

Amplifiers

AB-IOT-868

An 868 MHz band amplifier from Aliexpress. Marked AB-IOT-868.

https://www.aliexpress.com/item/1005006756311325.html

From the listing

Amplifier:

1. The product is a two-way amplified TDD working mode (that is, the transmit power and receiving sensitivity will be amplified equally);

2. The working voltage is 3.6V-6V;

  Current requirement for power adapter(Not included) : Max.  0.72A

3. This product is highly professional, and wireless communication is greatly affected by the environment. We only guarantee that all parameters are measured by the instrument.

Bi-directional amplifier. Built in TX switch on signal, should be >=1dBm, but threshold is -2dBm. Alternative, switch with SW pin, high for TX. Remove resistor first. 850MHz-930MHz

LEDs: Green RX, Blue TX.

Operating Voltage :AB-IOT-868-A: 5V(4.75V-5.25V)

Working current : RX status :10mA(±3mA) TX status :≤720mA

Adjustable gain When the potentiometer is turned counterclockwise to the limit, the gain is 5dB; When the potentiometer is turned clockwise to the limit, the gain is 11dB.

Testing

I measured the gain at 869.075 MHz, on receive with 20dB attenuator, so -15dBm in, as 12.2dB. With 10dB atten. (-5dBm in), gain 12.4dB. 60dB atten, (-55dBm in), gain 12.7dB.

Tried with VNA output at -4dB, result with 60dB atten same within noise. Maybe 0.1dB less gain.

Didn't test on TX.

amplifiers.txt · Last modified: 2024/10/04 21:08 by river

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