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This is the KB1SG Rhombic Termination Resistor page. It was written by Ian W. Cummings, KB1SG, and is displayed here with his permission.

Termination Resistor

vtr600 (41K)

Typical Application

  • Rhombic antenna terminating resistor, H.F. frequency, band 2-30MHz


  • Lightweight
  • Lightning protection
  • Minimum mainenance
  • Designed to meet environmental conditions


The VTR-600 termination resistor is comprised of passive components used to terminate a 600-ohm antenna while dissipating the power applied to the system.

The VTR-600 will terminate a 600-ohm antenna through the H.F. band of 2MHz to 30MHz.

The VTR-600 will dissipate 1KW of power at CW continuously for one hour and 500W continuously for extended operations.

Quick Reference Data

Electrical Specifications
Frequency Range 2 MHz to 30 MHz
VSWR Max. 1.2:1 over 2-30 MHz
Resistance 600 ohms non-inductive
Power Dissipation 1KW CW for 1 hr. continuous;
500W CW continuously

Environmental Tests (MIL-STD-810)

Humidity Temperature Shock Sand and Dust
Fungus Rain Leakage
High Temperature Snowload  
Low Temperature Icing  


  1. NATO Stock Number 5985-21-882-1782.
  2. Specifications subject to change without notice.

Valcom Ltd., P.O. Box 603, Guelph, Ontario N1H 6L3, Canada.
For more information, send e-mail to enquiries@valcom-guelph.com or phone (519) 824-3220.
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