Chapter 1 Introduction; Moduload Features; Indicators; Items Supplied - BIRD Moduload 8640 Series Operation Manual

Chapter 1
Bird 8640 and 8640B Series Moduloads are self-cooling, nonradiating, low reflection terminations for high power RF
lines. They dissipate up to 25 kW with a VSWR of less than 1.1:1 from 1 kHz to 900 MHz.
The Moduload has an interlock which triggers as a result of either high coolant temperature or low coolant flow. It
will also be active for about 2 seconds after power up or reset to ensure proper operation of the cooling system
before applying RF power.

Moduload Features


Useable with CW, AM, FM, SSB, and TV modulation, and certain pulse types. Contact Bird Electronic
Corporation for information on using Moduloads with pulsed signals.

Useable to make RF power measurements when used with a Bird 4600 or 4800 Thruline Wattmeter

Self-contained water-based cooling system

Time-delay interlock ensures steady coolant flow before RF power is applied

Indicators


Coolant Level Gauge

Items Supplied


Moduload

Instruction Manual

Power Meter Rack-Mount Kit

Items Required but not Supplied


No. 22 AWG wire, with ring terminals, for interlock connection

RF Coupling Kit

Distilled Water

Optional Items Available


Dolly (Bird P/N 6771-011) for moving the load

Ethylene Glycol, Industrial Grade, 1 Gallon - available from Bird
1
Introduction