1
Chapter 1
Introduction
General Description
The Model 8329-300 Attenuator is a low-reflection resistance network for use in reducing RF power in 50 ohm
transmission lines by known and controlled amounts.
The Model 8329-300 may be used for isolation of power sources up to 2000 W and for low level monitoring. This
attenuator is useful for lowering a high input RF power to a level suitable for feeding into an oscilloscope, frequency
counter or similar device. The low power value obtained at the output of the attenuator can easily be read on an
oscilloscope or terminated in a small RF load resistor.
It is a self-contained instrument that requires no external source of power (except if blower equipped) or utility
service. This attenuator is a passive device that is self-contained and does not need any external source of power or
utilities to function. The exception would be the use of the optional BA-300 blower for a higher cooling rate. The BA-
300-115 requires 115V at 50/60 Hz and the BA-300-230 requires 230V at 50/60 Hz.
The radiator has rhombic shaped cooling fins spaced evenly along its length for the most efficient cooling.
Relying
only on ambient air currents, this Tenuline
Attenuator will safely absorb, and dissipate harmlessly as heat, up to 2000
watts of input power. When equipped with an optional blower, Model BA-300, the increased air flow will allow a
doubling of the rated load capacity to 4000 watts. Over the frequency range of DC to 500 MHz, the power output
will be reduced by 30dB (99.9%) ±0.5dB. Up to 500 MHz, the input VSWR will not exceed 1.1 and the output VSWR
1.15. See
Items Supplied
The following items are supplied with the Model 8329-300.
LC Female connector - input end
N Female connector - output end
Instruction Manual
Items Required
The following items are required to put the Model 8329-300 into service.
Multimeter
Screwdrivers
Matching connectors on the coaxial transmission line.
Optional Items
The following items are available as optional equipment.
Overload thermoswitch, P/N 8329-028, for protection against burnout.
Quick-Change (QC) connectors for convenient and easy interchange with other “AN” type QC connectors.
Refer to the list in the Maintenance Chapter.
