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Bird Model 4391A Power Analyst
34
Specifications
Measuring Medium RF Transmission in 50 ohm lines
RF Power Range
*
100 mW to 10 kW full scale using Bird Plug-in Elements.
Accuracy not guaranteed with components not supplied by
Bird
Usable Over-Range
*
To 120% of scale on CW, PEP, SWR, and Return loss functions.
To 400% of scale (PEP) on dBm and 0% modulation.
Frequency Range
*
450 kHz to 2.7 GHz
Sampling Range 2-3 readings per second
Settling Time
10 seconds (worst case)
†
Accuracy
Power Readings
CW
PEP
SWR
% Modulation
Return Loss
±5% of full scale
±8% of full scale
±10% of reading
±5%
‡
±0.3 dB to corresponding SWR value
Impedance 50 ohms
Insertion SWR 1.05 max to 1000 MHz
Pulse Parameters (square pulses)
Pulse Width
Repetition Rate
Duty Cycle
0.8 µsec. min.
**
25 pps min.
0.01% min.
RF Line Connections
Standard
Optional
Bird Quick Change “QC” Female N
Any Standard AN “QC” type
Temperature Range
Operating
Storage
10ºC to 45ºC (50ºF to 113º F)
-20ºC to 45ºC (-4ºF to 113º F)
Input Power Requirements
Voltage
Frequency
Power
Batteries
Battery Life
100-130 or 200-230 VAC (Switch Selectable) or 7.2 Vdc
(internal battery)
50-60 Hz
6 Watts
6-1.2 V NiMH C size (Rechargeable)
12 hours approx.
Weight 5-3/4 lb (2.6 kg)
* Frequency band and power range is determined by the Plug-in Elements select-
ed. See Bird Catalog for availability. Some modes require two elements in a 10:1
power ratio.
† VSWR and return loss functions settle in less than 1 second.
‡ For CW power levels greater than one-third of full scale, accuracy of the percent
modulation mode is 5% from 0 to 90% and +10% from 90 to 100%. Modulation fre-
quency is 25 to 100,000 Hz; except for “A” and “B” elements: 25 to 20,000 Hz; and
“H” elements: 25-10,000 Hz.
** For “A” and “B” elements the minimum pulse width is 1.5 microseconds. For “H”
elements the minimum pulse width is 15 microseconds.