Bird - The RF Experts
3170B, Dual Meter - Dual Element, Single Carrier Wattcher RF Monitor

3170B, Dual Meter - Dual Element, Single Carrier Wattcher® RF Monitor
The 3170B Monitoring and Alarm System can automatically activate a variety of safety and equipment protection measures when it detects an abnormal antenna system load condition. The 3170B simultaneously displays forward and reflected power for 100 mW to 10 kW systems. Panel configuration consist of a line section complete with two QC-type N (female) connectors to insert in the coxial transmission line.

The RF monitoring system can protect your transmitting equipment from damage and loss of air time when faults cause high-standing waves. It can warn a remote operator of low power due to detuning, component deterioration, or AC line difficulties and high reflected power due to factors such as antenna icing, transmission line problems, physical accidents and lighting strikes.

product specifications:
Item No
Item Name
Dual Meter - Dual Element, Single Carrier Wattcher® RF Monitor
Power Range
100 mW to 10 kW using Bird® Plug-in Elements
Frequency Range
450 kHz - 2.7 GHz
Insertion VSWR
N Connectors 1.05 max. to 1000 MHz, 1.1 max. to 2700 MHz
± 5% of full scale
Meter Scales
(FWD and RFL) 25, 50, 100 W
Front Panel Buzzer, "Active" and "Trip" LEDs for forward/reflected
Response Time
25 µs max.
Activate Forward
73 µs to 50 ms nominal (adjustable) monitor delay
Front Panel Controls
Reset push-button, adjust FWD/RFL alarm levels screw, element sockets
Rear Panel Features
DC FWD/RFL signal inputs, main and remote meter drive outputs, external 12-16 VDC supply input, alarm in/out, reset in/out, AC line voltage selector, fuse, IEC 320 AC receptacle.
TTL compatible +5 V logic. Outputs for remote meter
AC Power
115/230 VAC, 50/60 Hz @ 56mA
DC Power
12.7 to 16.0 VDC @ 400mA max.
QC Type (Female N normally supplied)
Gray Powder Coat
(W x H x D)
19" x 5-7/32" x 9-5/16"
(483 x 133 x 237 mm)
7 lbs. (3.2 kg)
Required Products
Elements: Two from Tables 1, 2, 3, 3A, 4, or 6
Calibration Cycle
1 Year (for element)
compatible devices:
Table 1 - Standard Elements
7/8" Line Section - Standard Elements
Table 2 - Low Power Elements
7/8" Line Section - Low Power Elements
Table 3 - High-Frequency Elements, Entire Table ±8% FS
7/8" Line Section - High-Frequency Elements, Entire Table ±8% FS
Table 4 - Low Frequency Elements
7/8" Line Section - Low Frequency Elements
Table 6 - Milliwatt Elements
7/8" Line Section - Milliwatt Elements