Bird - The RF Experts

Channel RF Power Sensors

Provides power readings by individual channel for frequency ranges of 100 MHz to 1 GHz.

4042 Series, Channel Power Sensors are digital RF sensors designed for use with the 3141 Channel Power Monitor (CPM). The sensors are typically used to measure forward and reflected average power on a 50 ohm RF transmission line with maximum 500 watt forward and reflected power levels in a frequency band with an overall range of 100 to 1000 MHz. The 4042 sensor also provides VSWR readings.

The 4042 Channel Sensor is unique in that it is able to measure the forward power, reflected power and VSWR of a SINGLE CHANNEL in the presence of multiple channels at the output of a frequency combiner. The sensor can also measure the forward power, reflected power and the VSWR of the composite signal by scanning up to 16 individual channels and summing their power.

The 4042 Channel Sensor uses an RS-485 serial bus for data transfer to and from a CPM. Each sensor is equipped with two RJ-25 jacks, either jack may be connected to a CPM. The second RJ-25 jack may be used to extend the RS-485 bus to another digital sensor. Multiple digital sensors may be serially connected in this fashion, allowing as many as 16 sensors to be connected to a CPM.

Note: Each 4042 sensor is capable of occupying all 16 available channels. A maximum of two 4042 sensors may be connected to a CPM. If two 4042 sensors are used, they must share the 16 available channels.

product specifications:
Item No
Item Name
Channel Power Sensor
Measurement Range - FWD Power
10W to 500 W
Measurement Range - RFL Power
1 W to 50 W
Measurement Accuracy
±5% of reading
Frequency Range
(See connection options below to build part number)

ff: Frequency Range
43 = 100 MHz to 1000 MHz

ww: Max Forward Power Measurement
05 = 10 W to 500 W

xx: Communication Interface
05 = RS-485 via RJ-25

yy: Input Connector
01 = N (F)
02 = N (M)
03 = 4.3/10 (F)
04 = 4.3/10 (M)

zz: Output Connector
01 = N (F)
02 = N (M)
03 = 4.3/10 (F)
04 = 4.3/10 (M)
Dynamic Range
17 dB
Impedance Ω
Loss: <0.2 dB
VSWR: <1.15:1 (max)
Intermodulation Distortion - PIM
<-145 dBc
Power Supply
7-18 VDC, <500 mA (from 3141)
0 to 50 °C (32 to 122 °F)
5.2 in x 3.8 in x 1.4 in (132 mm x 96.5 mm x 35.5 mm)
.6 lb (.27 kg)
Standard Accessories
10 ft RJ-25 Interface Cable
compatible devices:
Channel Power Monitor Display
Ethernet, Channel Power Sensor Monitor
Directional Power Sensor, RJ-25
Ethernet, Directional Power Sensor Monitor
Non-Directional Power Sensor