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Reviews For: Bird Model 8329 Tenuline Coaxial Attenuator 30 db

Category: SWR & Wattmeters & Dummy Loads

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Review Summary For : Bird Model 8329 Tenuline Coaxial Attenuator 30 db
Reviews: 1MSRP: 3000
This review is intended for the original Bird Model 8329. This RF Attenuator is a low—reflection resistance
network for use in the measurement of high power in controlled and
known amounts. It is an electrical ”T" pad immersed in a liquid
coolant, using principles employed in Bird TERMALINE RF Load
Resistors, which permit the use of large resistive elements at high
frequencies while maintaining a low VSWR over a wide frequency
range. The Attenuator is designed to match the most commonly used
50—ohm transmission line systems.

The Model 8329 TENULINE is a self—contained instrument with
input power capability of 2000 watts, intended for cooling in air
of normal ambient temperatures. The Attenuator unit is rectangular
in shape with transverse cooling fins evenly spaced along its entire
length. Attached to the front and rear fins are mounting flanges.
These flanges act as supports for free standing use or mounting
brackets for optional fixed mounting. Mounting holes are provided
for this purpose.
Product is in production
More Info: http://
# last 180 days Avg. Rating last 180 days Total reviews Avg. overall rating
NG7M Rating: 2018-04-08
A must have for QRO Transmitter IMD Testing Time Owned: 0 to 3 months.
I picked up the original style / rectangle version of the Bird 8329 for tinkering around in the shack / lab with QRO amplifier testing. For sampling and looking at IMD products your amplifier puts out, this is perfect. It's the same version that ARRL uses for it's two-tone IMD testing of transmitters and amplifiers. If you can find one for a good price, you won't be disappointed. The new model will set you back about $3000, but I believe it is rated above 500 mhz. Here are some pictures of the one I cleaned up / restored:

Max NG7M