Bird Model 43 Wattmeter
40
Bird 4431 Thruline Wattmeter
The Bird 4431 RF Sampling Wattmeter is the same as the Bird 43
Thruline Wattmeter except for an RF signal sampler probe.
The RF sampler provides a low power sample of the signal being
transmitted through the wattmeter’s linesection. This signal is
available at the female BNC connector labeled “RF SAMPLE”, on the
right side of the housing. The signal level can be set with the control
knob on the front of the meter. The table below lists approximate
attenuation levels, and notes maximum suggested adjustment. The
sampler output may be fed to any suitable RF signal monitoring
device; e.g. a frequency counter, spectrum analyzer, or oscilloscope. All
other operation instructions are the same as for the Bird 43.
Sampler at max
(Fully clockwise)
Turned counter-
clockwise 4 full turns
from max*
Turned counter-
clockwise 7 full turns
from max*
Freq.
(MHz)
Atten.
(dB)
Freq.
(MHz)
Atten.
(dB)
Freq.
(MHz)
Atten.
(dB)
2 69 300 38 800 36
10 57 400 34 900 35.5
25 46 500 30 1000 35
50 42 600 29.5
75 39 700 29 * Approximate
attenuation
100 36 800 28.5
200 31 900 28
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