Practical Implementation of Radiated Emission Reduction and Frequency Stabilisation of ISM Equipment Operating in the 27 MHz Band

This work performed by ERA Technology Ltd for the Radiocommunications Agency (RA) concerns practical but systematic approaches in combating radio frequency interference (RFI) from industrial, scientific and medical (ISM) equipment operating at 13 MHz and 27 MHz. Previous work reported in ERA Report 98-0221 identified three factors which will cause RFI: field strength of radiated emissions, frequency of operation and harmonic emissions. The work presented in this report deals with the practical implementation of three techniques to reduce RFI,

1. polarisers to reduce radiated emissions from buildings
2. vestibules to reduce harmonic emissions from conveyorised systems
3. frequency stabilisation procedure applied to an old C-frame plastic welder operating at 50 MHz.

	Main Report	Download in Word 97 (1,731 KB)
	Appendix A: Task 100 - Polarisers for reducing radiated emissions from ISM machines operating at 13.56 MHz and 27.12 MHz	Download in Word 97 (422 KB)
	Appendix B: Task 200 - Assessment of vestibules and associated structures for the spurious emission reduction from 27 MHz ISM heating machines	Download in Word 97 (1,131 KB)
	Appendix C: Task 300 - Frequency stabilisation technique for ISM machines operating at 13.56 MHz and 27.12 MHz	Download in Word 97 (8,780 KB)
	Appendix D - Flow Charts	Download in Word 97 (85 KB)
	Download the complete report Word 97 zipped (6,010KB)

Top