WISCO International (Bird- Model 43 / 4300-400 / 43P / 4430)

Model 43

The Model 43 THRULINE ® Directional Wattmeter accurately measures forward or reflected power in coaxial transmission lines under any load condition. It is ideal for analog wireless systems, as well as general power measurement of CW, FM, and PM signals from 450 kHz to 2.7 GHz and 100 mW to 10 kW.

The Model 43 consists of a precision, 50-ohm line section, leQCio (Quick Change) connectors and a shock-mounted 30 microamp indication meter housed in a rugged, corrosion-resistant aluminum case. Two female leNil-type leQCi- connectors are normally supplied, but these connectors can be interchanged in the field by removing four screws.

Remote installation can be achieved by removing the Model 43 RF line section and inserting it at any desired point in the transmission line while the meter itself is mounted in a convenient location.

Ideal for power measurements of single-carrier, CW, FM, and Phase-Modulated RF signals.

±5% of full-scale reading accuracy.

Specifications

Power Range: 100 mW to 10 kW.

Frequency Range: 450 kHz to 2.7 GHz.

Insertion VSWR: (with N Connectors) 1.05 max. to 1000 MHz.

Accuracy: ±5% of full scale.

Connectors: QC Type (Female N normally supplied).

Finish: Light gray powder coat.

Nominal Size: (includes connectors) 6 7/8 " L x 5 1/8 " W x 3 5/8 " D,
(175 mm 5 130 mm 5 92 mm).

Weight: 3 lb. (1.4 kg).

Elements: Tables 1, 2, 3, 3A and 6.

Since 1952, over 250,000 Bird Model 43 Wattmeters have been produced. The Model 43 and its derivatives continue to be the portable wattmeters of choice for average reading power measurements of analog, CW-type signals. If you’re working with digital modulation, we recommend the APM-16

Model 4300-400 & Model 43P

Peak-Reading Retrofit Kit for Model 43 Wattmeter Model 43-Style Wattmeter with Variable RF Tap

The 4300-400 kit adapts the Model 43 wattmeter to read true peak power output at ±8% of full-scale accuracy. Also available fully assembled as the Model 43P.

Preserves standard Model 43 specifications, features and operation.

Installs easily, without soldering.

Specifications

Power Range: 100 mW to 10 kW.

Frequency Range: 450 kHz to 2.7 GHz.

Elements: Tables 1, 2, 3, 3A, and 6.

Accuracy: CW mode: ±5% full scale.

Peak mode: ±8% full scale.

Modulation: Normal voice audio, or (Peak Mode) Rectangular pulses with duty cycle: 2% (min), Repetition rate: 100 pps (min), Pulse width: 200 µs (minimum).

Battery Life: 48 hours typical.

Weight: Adds 1 lb. to Model 43.

Model 4431

The Model 4431 provides an RF signal sample while a power measurement is made. A signal coupling control on the front of the case adjusts sample amplitude.

Simplifies signal investigation with counters, oscilloscopes, etc.

Convenient, side-mounted BNC outputconnector.

Specifications

Frequency and Power Range: 5 kW max. from 2 MHz to 30 MHz, 1 kW max. from 30 MHz to 1000 MHz.*

Elements: Tables 1, 2, 3, 3A and 6.

Insertion VSWR: with N connectors 1.07 max.* to 1000 MHz.

Accuracy: ±5% of full scale.

Insertion Loss: 0.1 dB max. (2 MHz-512 MHz), 0.2 dB max.
(512 MHz-1000 MHz).*

RF Sample Output: Variable -15 to -70 dB from BNC (Female) port.

Connectors: QC Type (Female N normally supplied).

Finish: Gray powder coat.

Nominal Size: (includes connectors) 6 7/8"L x 5 1/8" W x 3 5/8" D,
(175 mm 5 130 mm 5 92 mm).

Weight: 3 1/2 lb. (1.6 kg).