MFJ -9232 Instruction Manual
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MFJ -9232 Instruction Manual

Qrp mini loop tuner
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QRP Mini Loop Tuner
Model MFJ-9232
INSTRUCTION MANUAL
CAUTION: Read 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 MF J ENT ERPRISES, INC.
VERSION 1A

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  • Page 1 QRP Mini Loop Tuner Model MFJ-9232 INSTRUCTION MANUAL CAUTION: Read 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 MF J ENT ERPRISES, INC. VERSION 1A...
  • Page 2 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 8-4:30 CST. - 2 -...
  • Page 3 It is designed for 50-ohm use at QRP- power input on all modes. Two items are required: • MFJ-9232 Mini Loop Tuner (Shown in Figure 1) • Wire Loop(s) (not included) Figure 1: MFJ-9232 Mini Loop Tuner - 3 -...
  • Page 4 It uses special low-loss capacitors for high efficiency and interfaces the Hi-Q transmitting loop circuit with any length of 50-Ohm coaxial cable. No ground, radials, or counterpoise system are needed. The MFJ-9232 Mini Loop Tuner functions with wire loops of any shape -- circle, square, rectangle etc.
  • Page 5 Instruction & Technical Manual RF HAZARD PRECAUTIONS RF HAZARD BACKGROUND INFORMATION The following WARNINGS should be observed when using your MFJ-9232 MINI LOOP TUNER ACUTE INJURY WARNING DO NOT touch or make skin contact with the Loop Connectors or Loop Antenna Wire while transmitting...
  • Page 6 MFJ-9232 Mini Loop Tuner Instruction & Technical Manual RF HAZARD PRECAUTIONS An electromagnetic wave is characterized by its wavelength and frequency. The wavelength is the distance covered by one complete wave cycle. The frequency is the number of waves passing a point in a second.

  • Page 7: Important Note

    RF fields very near the antenna that are much higher than the standard amateur radio station outdoor antenna installation yields. Therefore, when you use the MFJ-9232 Mini Loop Tuner in your Ham Shack, at a portable location (outdoors), or one such as a hotel/motel room, you must take care not to exceed established MPE for yourself and others who may encounter the RF field associated with your operation.
  • Page 8 MFJ-9232 Mini Loop Tuner Instruction & Technical Manual RF HAZARD PRECAUTIONS RF-RADIATION EXPOSURE CONCERNS Controlled population exposure limits apply to amateur licensees and members of their immediate household (but not their neighbors - see next paragraph). In general, a controlled environment is one for which access is controlled or restricted.
  • Page 9 An operational height equal to 1/2 diameter of the loop antenna is recommended to prevent detuning and excess ground losses when using the MFJ-9232 Mini Loop Tuner loop antenna system. This means the tuner should be at that recommended height, since it is connected to the bottom (ends) of the loop, whatever the loop antenna configuration: circle, square, hexagonal, etc.
  • Page 10 • 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 setup configuration. Transmitter/ SWR/...
  • Page 11 Designing an outdoor loop for a band such as 7 MHz could be a challenge and result in a very good radiator and especially good receiving antenna for DX-ing and/or rag-chewing. We, at MFJ, think the experimental aspects of the Mini Loop Tuner are exciting, and can provide hours of quality operating, even at QRP levels.
  • Page 12 SYSTEM OPERATION MFJ-9232 MINI LOOP TUNER OPERATION The most important aspect of using the MFJ-9232 Mini Loop Tuner is it opens-up opportunity for Hams to once again experiment while enjoying operating at the same time. Imagine how exciting it can be to establish contact with a distant station using an antenna that you designed for the first time.
  • Page 13 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 WR/Wattmeter. Readjust the controls until you see no further improvement in minimum SWR. Then, apply more power if required to maintain communication (do not exceed 25 Watts).
  • Page 14 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 description of your problem, an explanation of exactly how you are using your unit, and a complete description of your station.
  • Page 15 MFJ Enterprises, Inc. warrants to the original owner of this product, if manufactured by MFJ Enterprises, Inc. and purchased from an authorized dealer or directly from MFJ Enterprises, Inc. to be free from defects in material and workmanship for a period of 12 months from date of purchase provided the following terms of this warranty are satisfied.
  • Page 16 MFJ ENTERPRISES, INC. MFJ-9232 Manual 300 Industrial Park Road Version 1A Starkville, MS 39759 Printed In U.S.A.

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