Katie Wright
Articles
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How do I read Forward and Relected RF power on a Model 43 wattmeter?
The reading depends on the plug-in element being used. For example, if you have a 100 W element, you use the corresponding scale that ends in 100 (the bottom numbers on the display). Similarly if y...
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Practical Guidance on VSWR & Return Loss
When RF energy travels through feed or transmissions lines, it is susceptible to reflections or bounces. When we send RF down a coax cable, we want it to go into the antenna and then radiate out in...
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Average Power Handling for QC Connectors
Please see graph of QC connectors and associated average power ratings below.
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4381 RF Power Analyst
The 4381 RF Power Analyst is obsolete however the PDF manual and specifications are shown below. The 4391A is the replacement model found here: 4391A Product Information
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Frequency Response of Bird Elements
Bird Plug-In Elements have a flat frequency response over their specified operating range. A sample set of curves is shown below. Notice that for the low power element, the roll-off outside its fre...
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How often do I need to calibrate my Model 43 wattmeter?
Bird recommends a 1 year calibration cycle for the Model 43 and its elements. To request a factory calibration and/or calibration pricing, please click here for an: RMA Request Form
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How do I Repair a Model 43?
The following table contains troubleshooting information for problems that can occur during normal operation of a Model 43 family of wattmeters. If you need your wattmeter serviced or calibrated, t...
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Model 43P Wattmeter
The model 43P portable, thru-line wattmeter is ideal for measuring peak and average RF power. However, to measure digital radio RF power, it is recommended that the APM-16 portable wattmeter or the...
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What Slugs are available for Bird Model 43?
The Bird Model 43 wattmeter uses elements from the following tables: Tables Frequency Power Link to Element Selection Table 1 2 - 1000 MHz 5 - 2,500 W Standard Elements Table ...
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What is the accuracy of the 7/8" line plug-in elements?
The accuracy is +/- 5% of the full scale value for elements shown in Table 1, 2, 4 and 6. For example, if you are using a 500W element, the accuracy will be +/- 25W (5% x 500W). If you want to meas...