Bird 4042 – Channel RF Power Sensors

• Designed for use with the 3141 Channel Power Monitor (CPM)
• 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
• Uses an RS-485 serial bus for data transfer to and from a CPM
• Please see below for configuration information

Bird 4042 Series Channel Power Sensors are digital power sensors designed for use with the Bird 3141 Channel Power Monitor (CPM).

4042 Series Channel power sensors are typically used to measure forward and reflected average power on a 50 ohm RF transmission line in a frequency band with an overall range of 100 to 1000 MHz. There are two maximum forward power measurement options 50 or 500 watts with reflected power max 10 dB below the forward Power levels, 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.

If multiple sensors are to be connected serially, each one is assigned a unique address via the CPM. When each sensor is connected to the CPM, prior to connecting any additional sensors, add sensor in the CPM to assign an address, only then may an additional sensor be connected serially.

A termination plug must be used in the open RJ-25 jack on the rear panel of the CPM or the open RJ-25 jack of the final digital sensor in the chain.

The Bird 4042 Series Channel Power Sensors are designed to be used for continuous power monitoring in multiple Land Mobile Radio (LMR) systems. When used with the Bird CPM the 4042 can provide real-time RF forward and reflected power and VSWR measurements.

Part numbers for the Bird 4042 use the format described below:

4042-1-ffwwxx-yyzz

• ff: Frequency Range
• 41 = 30 MHz to 200 MHz
• 43 = 100 MHz to 1000 MHz
• ww: Max Forward Power Measurement
• 05 = 500 W
• 06 = 50 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)