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Summary of Contents for MFJ MFJ-207
- Page 1 HF 10-160M SWR Analyzer Model MFJ-207 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 2006 MFJ ENTERPRIS ES , INC. VERSION 0B...
- Page 2 MFJ-207 Instruction Manual HF 10-160M SWR Analyzer...
- Page 3 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 8-4:30 CST.
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Page 4: Table Of Contents
TOPIC PAGE 1. TABLE OF CONTENTS 2. LIST OF FIGURES AND TABLES 3. INTRODUCTION AND FEATURES 4. USES FOR THE MFJ-207 5. SYSTEM CONTROLS AND INDICATORS 6. THEORY OF OPERATION 7. MFJ-207 EASY-START INSTRUCTIONS 8. IN CASE OF DIFFICULTY 9. TECHNICAL ASSISTANCE APPENDICES A. -
Page 5: Uses For The Mfj-207
Travel or any time you need to check out a new antenna installation quickly easily. Accurate – The Bridge Circuit uses precision resistors for utmost in accuracy. Great Value – The MFJ-207’s low cost puts a great instrument in your hands for those who only need to adjust their antennas occasionally. -
Page 6: System Controls And Indicators
FIGURE 1: Front Panel Jacks and Controls 1. Power On LED: Instantly know if the MFJ-207 is on or off with this bright LED. 2. Band Select Switch: This 6 position switch turns the power on and selects any one of five over lapping bands. - Page 7 Appendix A. 3. PWR: This 2.1 mm jack allows you to attach a MFJ-1312D AC adapter or feed power from your station supply.
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Page 8: Theory Of Operation
MFJ-207 Instruction Manual HF 10-160M SWR Analyzer THOERY OF OPERATION Block Diagram FIGURE 3: Block Diagram Refer to Figure 3 and the Schematic diagram Figure 5 for this discussion of the theory of operation. RF is developed in the VCO consisting of L1 through L10 and the associated FETs Q1 and Q2 along with the variable capacitor. - Page 9 The MFJ-207 requires the optional MFJ-1312D power supply adapter or a nine-volt transistor battery. If using a battery with the MFJ-207 ensure it is an ALKALINE nine-volt battery. Additionally you can use a 13.8 volt power supply by connecting a 2.1 mm plug to the cable with the positive wire connected to the center pin and the ground wire connecter to the outer pin.
- Page 10 1:1 SWR or the lowest value obtainable. NOTE: The MFJ-207 can tell you whether the antenna element are to short or too long. If you find the resonant frequency of the antenna is lower than the frequency you wish then the elements are too long.
- Page 11 Never transmit into or through the MFJ-207. Take the MFJ-207 completely out of line before transmitting! Damage to your MFJ-207 will result if left in line. We recommend using the MFJ-1702 coax switch as shown in the diagram below for ease of use when changing bands.
- Page 12 HF 10-160M SWR Analyzer EASY START INSTRUCTIONS WARNING NEVER TRANSMIT WHILE THE MFJ-1702 COAX SWITCH IS SWITCHED TO A IF THE TRANSMITTER IS CONNECTED TO B. SERIOUS DAMAGE TO YOUR RADIO CAN OCCUR. TRANSMIT ONLY WHEN THE COAX SWITCH IS SWITCHED TO THE CONNECTOR TO WHICH THE TRANSMITTER IS CONNECTED.
- Page 13 Go to Appendix C and find the 1 db loss line which curves up and to the right. Now assume you are using your MFJ-207 and find the lowest SWR you can get on your antenna is 2.0:1. Follow the 1.15 db line (between the 1 db line and the 2 db line) down to th point it reads 2.0:1 on the horizontal axis (SWR at transmitter).
- Page 14 MFJ-207 Instruction Manual HF 10-160M SWR Analyzer Figure 5: MFJ-207 Schematic Diagram...
- Page 15 Antenna input of the receiver. Place the far end of the wire near the receiver but do not connect it to the receiver’s input unless you simply cannot hear the signal at all. The output of the MFJ-207 is a high level and damage to the front end of some radios may occur with a direct connection, so you assume all risks in making a direct connection.
- Page 16 MFJ-207 Instruction Manual HF 10-160M SWR Analyzer APPENDIX B FREQUENCY/SWR PLOTTING CHART...
- Page 17 MFJ-207 Instruction Manual HF 10-160M SWR Analyzer APPENDIX C SWR at Transmitter Vs. SWR at Antenna...
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Page 18: In Case Of Difficulty
If you have any problem with this unit first check the appropriate section of this manual. If the manual does not reference your problem or is your problem is not solved by reading the manual, you may call MFJ Technical Service at 662-323-0549 or the MFJ Factory at 662-323-5869.
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