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Summary of Contents for MFJ MFJ-936C
- Page 1 Deluxe High-Efficiency Magnetic Loop Tuner MFJ-936C INSTRUCTION MANUAL ©2020 300 Industrial Park Rd. Starkville, MS 39759 P: (662) 323-5869 F: (662) 323-6551...
- Page 2 The copy of this manual provided to the customer will not be updated to reflect current data. Customers using this manual should report errors or omissions, recommendations for improvements, or other comments to MFJ Enterprises, 300 Industrial Park Road, Starkville, MS 39759. Phone: (662) 323-5869 Fax: (662) 323-6551 Business hours: M-F 8:00 AM - 4:30 PM CST/CDT.
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Page 3: Table Of Contents
The MFJ-936C ........ -
Page 4: Radio Frequency Hazards
MFJ-936C Deluxe High-Efficiency Magnetic Loop Tuner Instruction & Technical Manual RADIO FREQUENCY HAZARDS BACKGROUND INFORMATION The following warning is printed on the back of the MFJ-936C Deluxe High-Efficiency Magnetic Loop Tuner ™. WARNING DO NOT touch or come into contact with Loop Connectors or... -
Page 5: An Electromagnetic Plane Wave
MFJ-936C Deluxe High-Efficiency Magnetic Loop Tuner Instruction & Technical Manual Figure 1: An Electromagnetic Plane Wave Electromagnetic waves travel through space at the speed of light. Wavelength and frequency are inversely related by a simple equation: frequency wavelength = the speed of light, or Since the speed of light is a fundamental constant, High Frequency (HF) electromagnetic waves have short wavelengths, and Low-Frequency (LF) waves have long wavelengths. -
Page 6: Rf Precautions
HF loops, for example, yield RF fields very near the antenna that are much higher than the standard amateur radio station outdoor antenna installation fields. Therefore, when you use the MFJ-936C Deluxe High-Efficiency Magnetic Loop Tuner ™ in your shack, at a portable location, or in a hotel room, care must be taken to exceed established MPE to yourself and others who may encounter the RF field associated with your operation. -
Page 7: Rf Radiation Exposure Concerns
OPERATING ENVIRONMENTS & GUIDELINES Tables 1 and 2 list various MFJ-936C Deluxe High-Efficiency Magnetic Loop Tuner ™ operating environments, average power level, and safe distances that should provide compliance with the FCC’s MPE recommendations and standards for controlled and uncontrolled populations. -
Page 8: 100W Indoor And Outdoor Operating Environment
MFJ-936C Deluxe High-Efficiency Magnetic Loop Tuner Instruction & Technical Manual Table 1: 100W Indoor and Outdoor Operating Environment Frequency (MHz) Controlled Population Uncontrolled Population Height (m) Exposure (ft m) Exposure (ft m) 1.18 0.36 1.68 0.51 1.25 0.38 2.48 0.75 1.88... -
Page 9: The Mfj-936C
The MFJ-936C Deluxe High-Efficiency Magnetic Loop Tuner ™ has a mount for either an MFJ-57B or MFJ-58B PVC Cross assembly or your own homebrewed assembly. The assembly is inserted into the three-quarter-inch PVC receptacle mounted on the top of the unit’s cover. -
Page 10: Features
• Indoor Use: Perfect for apartments, hotel rooms, antenna restricted and portable locations. CONTROLS & CONNECTIONS The MFJ-936C Deluxe High-Efficiency Magnetic Loop Tuner ™ front panel controls and indicators (Figure 4) function to permit matching the wire or coax loop to the coaxial line at the input of the tuner. -
Page 11: Loop Theory
8. PVC MOUNT: This is the mount point for the PCV cross assembly. The MFJ-936C Deluxe High-Efficiency Magnetic Loop Tuner ™ Rear Panel connections function to permit connecting the wire loop at the output, and connecting the coaxial line at the input of the tuner. -
Page 12: System Setup
flowing in the soil via capacitance between the loop and soil surface. These are all reduced by increasing the height of the MFJ-936C above the ground as measured from the tuner box. An operational height equal to... -
Page 13: Configuration
Designing an outdoor loop for a band such as 7 MHz could be a challenge yet result in a very good radiator and especially good receiving antenna for DX-ing and rag-chewing. We at MFJ think the experimental aspects of the MFJ-936C are exciting, and can provide hours of quality operating, even at QRP levels. -
Page 14: Detailed Operation Instructions
Antenna while transmitting YOU CAN BE SERIOUSLY INJURED Step 1 Place the MFJ-936C Deluxe High-Efficiency Magnetic Loop Tuner ™ at the chosen place of operation, and connect either the wire loop to the wing nut terminals on the rear panel or the coax loop to the SO-239 connectors on the side. -
Page 15: Quick-Start Instructions
• Once a peak is found, alternately adjust the TUNING and MATCHING controls until the peak is maximized. Step 6 Apply 10 to 20 Watts of power to the MFJ–936C and adjust the TUNING control for maximum RF current and the MATCHING control for minimum SWR on your external SWR/Wattmeter. - Page 16 S-Meter reading. The tuner will produce a peak when the exact position for the controls and switches is found. Step 5 Apply 10 to 20 Watts of power to the MFJ–936C and adjust the TUNING control for maximum RF current and the MATCHING control for minimum SWR on your external SWR/Wattmeter.
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Page 17: Mfj-936C Accessories
MFJ Technical Service at (662) 323-0549 or the MFJ Factory at (662) 323-5869. You will be best helped if you have your unit, manual and all information on your station handy so you can answer any questions the technicians may ask. - Page 18 USER NOTES...
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