6715D/Rev. Jul.2020
Page 8
Altronic Research Inc.
INTRODUCTION
This handbook was prepared for technical personnel as an aid in understanding and
performing installation, service and maintenance procedures for the Digital UHF
OMEGALINE
®
Model 6715D Air-Cooled Coaxial Load. Personnel are considered to be
skilled if they have the necessary knowledge and practical experience of electrical and
radio engineering to appreciate the various hazards that can arise from working on radio
transmitters, and to take appropriate precautions to ensure the safety of personnel.
SECTION I
DESCRIPTION AND LEADING PARTICULARS
1-1. Purpose and Application of Equipment.
The OMEGALINE
®
Model 6715D Coaxial
Load is designed to safely dissipate a maximum of 15,000 watts of electrical energy over
the UHF frequency range.
1-2. Equipment Supplied.
The Model 6715D Coaxial Load is supplied with standard RF
connectors. Their designations are:
3-1/8" EIA Swivel flange:
Model # 6715DE3
3-1/8" Unflanged flush:
Model # 6715DF3
3-1/8" Unflanged recessed:
Model # 6715DR3
The standard power supply voltages and their designators after the Model # are:
-110: 110-120VAC, single phase, 50/60 Hz
-230: 208-230VAC, single phase, 50/60 Hz
1-3. Equipment Required But Not Supplied.
The Model 6715D Coaxial Load is complete as
supplied, but the user must furnish AC Mains input, RF input, interlock control cable and
ground cable appropriate to each installation.
1-4. General Description.
The Model 6715D Coaxial Load is enclosed in a single aluminum
case which is painted with a durable acrylic finish. Power connection is made through an
IEC connector on the rear panel of the enclosure. This panel also contains a 4-screw barrier
terminal strip for connection of the interlock circuit and a 1/4-20 UNC-2B stud for
attachment of the ground. The RF connector is located in the center of the top panel.
1-5. Electrical Description.
The Model 6715D contains a 50 ohm non-reactive resistor
assembly capable of dissipating 15,000 watts of applied electrical energy at sea level at
UHF band frequencies with a maximum VSWR of 1.15 to 1. No provisions are made for
tuning the resistor assembly and all operating controls relate to the operation of the blower
assembly. The blower control circuit consists of three switches wired in parallel to control
the blower motor contactor. Power is supplied to this contactor and to the "Blower On"
lamp whenever the equipment is attached to the correct power supply and the main power