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MFJ-9232 Mini Loop Tuner

TM

 

 

 

Instruction & Technical Manual 

 

- 10 - 

SYSTEM SETUP 

 
 

SYSTEM SETUP CONFIGURATION 

 
The MFJ-9232 

Mini Loop Tuner

 TM

 setup configuration is simple and consists of the following 

components: 
 

•

  RF Generator (Transmitter or transceiver, 5-Watts minimum) 

•

 SWR/Wattmeter 

 

•

 MFJ-9232 

Mini Loop Tuner

 TM

 

•

 Coaxial 

cable(s) 

•

  #10 gauge (or larger) stranded wire cut to approximately 75% of a ¼ wavelength at the chosen 

resonant frequency 

 

Figure 3 is a block diagram of the typical MFJ-9232 

Mini Loop Tuner

 TM

 setup configuration. 

 

 

 

 

 

 
 
 
 
 
 
 

 

 

 
 
 
 

Figure 3: Typical MFJ-9232 Mini Loop Tuner

 TM

 Configuration 

 

 

 

Transmitter/ 

Transceiver 

 

 

SWR/ 

Wattmeter 

 

 

Matching 

Network 

 

Loop 

 

MFJ–9232 Mini Loop 

Tuner 

Summary of Contents for MFJ-9232

Page 1: ...ad All Instructions Before Operating Equipment MFJ ENTERPRISES INC 300 Industrial Park Road Starkville MS 39759 USA Tel 662 323 5869 Fax 662 323 6551 COPYRIGHT 2016 MFJ ENTERPRISES INC Model MFJ 9232 VERSION 1A QRP Mini Loop Tuner ...

Page 2: ...chnical manuals documents positional handbooks or other official publications 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...

Page 3: ...ni Loop Tuner TM is a small versatile high efficiency device that turns any wire loop into a high efficiency multi band transmitting antenna system It is designed for 50 ohm use at QRP power input on all modes Two items are required MFJ 9232 Mini Loop Tuner TM Shown in Figure 1 Wire Loop s not included Figure 1 MFJ 9232 Mini Loop Tuner ...

Page 4: ...J 9232 Mini Loop Tuner TM uses fixed wire lengths to cover roughly a 1 5 1 frequency ratio 28 18 MHz 10 7 MHz etc Exact frequency coverage depends on each individual installation and involves your choice of wire length loop diameter loop shape height above ground level plus other stray factors in the immediate operating environment MFJ 9232 MINI LOOP TUNERTM FEATURES Passive Network No power suppl...

Page 5: ... power limitation 25W RF burns can be exceptionally painful and slow to heal EXCESSIVE RF EXPOSURE NOTICE You must follow all PRECAUTIONS WARNINGS and FCC Guidelines for Human Exposure to Radio frequency RF Electromagnetic Fields What Is Radio Frequency RF Radiation Radio frequency RF energy is one form of electromagnetic energy Electromagnetic waves and associated phenomena can be discussed in te...

Page 6: ...cy HF electromagnetic waves have short wavelengths and Low Frequency LF waves have long wavelengths Frequency bands used for amateur radio transmissions are usually characterized by their approximate corresponding wavelengths e g 12 15 17 20 meters etc The electromagnetic spectrum includes all of the various forms of electromagnetic energy ranging from extremely low frequency ELF energy with very ...

Page 7: ...ur radio stations with FCC guidelines for exposure to radio frequency electromagnetic fields However Supplement B users should also consult Bulletin 65 for complete information on FCC policies guidelines and compliance related issues Definitions of terms used in this supplement appear in Bulletin 65 Bulletin 65 can be viewed and downloaded from the FCC s Office of Engineering and Technology s Worl...

Page 8: ... and training as described in FCC OET Bulletin 65 Supplement B General population uncontrolled exposure limits apply to situations in which the general public may be exposed or in which persons who are exposed as a consequence of their employment such as hotel motel employees or overnight residents may not be made fully aware of the potential for exposure or cannot exercise control over their expo...

Page 9: ...ccordingly When traveling a room at some elevation above ground level makes for a better portable operation experience At very low heights close coupling to the ground causes detuning and losses due to current induced into a mirror image of the loop below the surface with resistance of the image loop proportional to soil resistance Another loss component is caused by current flowing in the soil vi...

Page 10: ...or transceiver 5 Watts minimum SWR Wattmeter MFJ 9232 Mini Loop Tuner TM Coaxial cable s 10 gauge or larger stranded wire cut to approximately 75 of a wavelength at the chosen resonant frequency Figure 3 is a block diagram of the typical MFJ 9232 Mini Loop Tuner TM setup configuration Figure 3 Typical MFJ 9232 Mini Loop Tuner TM Configuration Transmitter Transceiver SWR Wattmeter Matching Network ...

Page 11: ... 8 53 30 M 20 0 6 96 20 M 13 0 3 96 17 M 9 0 2 75 15 M 7 0 2 13 12 M 5 5 1 68 10 M 4 0 1 22 MFJ 9232 Multi Band Loop Wire Lengths Bands Length feet Length meters 40 30 M 20 0 6 96 30 20 M 13 0 3 96 30 20 17 M 9 0 2 75 20 15 M 7 0 2 13 17 15 10 M 4 0 1 22 The applications and parameters can be adjusted easily with the help of the Freeware programs previously mentioned and you may choose to design a...

Page 12: ...n WARNING DO NOT touch or come into contact with Loop Connectors or Loop Antenna while transmitting YOU CAN BE SERIOUSLY INJURED Step 1 Place the MFJ 9232 Mini Loop Tuner TM at the chosen place of operation and connect the loop antenna to the wing nut terminals on the rear panel Step 2 Using a pre cut prepared wire and fasteners non conductive plastic clothespins for example form a loop to enclose...

Page 13: ...epeat this sequence until the MATCHING control reaches position Max C If no peak is found the loop length is incorrect for the frequency of interest Once a peak is found alternately adjust TUNING and MATCHING controls until the peak is maximized Step 6 Apply no more than 5 10 Watts of power to the MFJ 9232 Mini Loop Tuner and adjust the TUNING and MATCHING controls for minimum SWR on your external...

Page 14: ... 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 You can also send questions by mail to MFJ Enterprises Inc 300 Industrial Park Road Starkville MS 39759 by Facsimile FAX to 662 323 6551 or by email to techinfo mfjenterprises com Send a complete desc...

Page 15: ...is available by calling the Service Department at 662 323 0549 or the MFJ Factory at 662 323 5869 4 This warranty does not apply to kits sold by or manufactured by MFJ Enterprises Inc 5 Wired and tested PC board products are covered by this warranty provided only the wired and tested PC board product is returned Wired and tested PC boards installed in the owner s cabinet or connected to switches j...

Page 16: ...MFJ 9232 Manual Version 1A Printed In U S A 300 Industrial Park Road Starkville MS 39759 MFJ ENTERPRISES INC ...

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