Bird - The RF Experts
4527, Dual Meter - Dual Element and Sampler Port, Panel-Mount Wattmeter

4527, Dual Meter - Dual Element and Sampler Port, Panel-Mount Wattmeter is tailored for 2-way mobile applications in the 2-512 MHz range. The panel is configured with dual meters and element sockets. These features let you determine VSWR more precisely using a more sensitive reflected power element and simultaneously read forward and reflected power. In addition, an variable RF probe provides a low power sample of the signal being measured and is available at a female BNC connector on the front panel, along with a control knob for adjustment.

The sampled output can be connected to any RF signal monitoring device such as a frequency counter, spectrum analyzer, or oscilloscope. Select elements up to 1000 watts form 2-200 MHz and up to 500 watts from 200-512 MHz. This model is not recommended for use in the antenna line of combined transmitter systems due to the risk intermodulation product generation. Consult the factory for appropriate combined transmitter monitoring products.

product specifications:
Item No
Item Name
Dual Meter, 2-512 MHz with Sampler Port
Power Range
100 mW to 1000 W using Bird® Plug-in Elements
Frequency Range
2 -512 MHz (depending on element)
Insertion VSWR
with N Connectors 1.05 max. to 512 MHz
± 5% of full scale
RF Sample Output
Fixed at -53 dB from 512 to 10 MHz
decreasing to -70 dB at 2 MHz BNC (Female) port
QC Type N (F) normally supplied
Gray Powder Coat
(W x H x D)
19" x 5-7/32" x 1-11/16"
(483 x 133 x 43 mm)
3-1/2 lbs.(1.6 kg)
2 to 512 MHz models with Tables 1, 2, 6
Quoted accuracy only when used with other Bird® Products.
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 6 - Milliwatt Elements
7/8" Line Section - Milliwatt Elements