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 VERSION 0B COPYRIGHT C 2006 MFJ ENTERPRIS ES , INC.
MFJ-207 Instruction Manual HF 10-160M SWR Analyzer
MFJ-207 Instruction Manual HF 10-160M SWR Analyzer DISCLAIMER Information in this manual is designed for user purposes only and is not intended to supersede information contained in customer regulations, technical 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.
MFJ-207 Instruction Manual HF 10-160M SWR Analyzer TABLE OF CONTENTS TOPIC PAGE 1. TABLE OF CONTENTS 2 2. LIST OF FIGURES AND TABLES 2 3. INTRODUCTION AND FEATURES 3 4. USES FOR THE MFJ-207 4 5. SYSTEM CONTROLS AND INDICATORS 5 6. THEORY OF OPERATION 7 7. MFJ-207 EASY-START INSTRUCTIONS 8. 8 IN CASE OF DIFFICULTY 17 9. TECHNICAL ASSISTANCE 17 APPENDICES A. ZERO BEATING AGAINST A RECEIVER 14 B. FREQUENCY/SWR PLOTTING CHART 15 C. SWR AT TRANSMITTER VS.
MFJ-207 Instruction Manual INTRODUCTION: HF 10-160M SWR Analyzer The MFJ-207 gives you a direct readout of your antenna’s SWR without the need for formulas or indirect readings. The MFJ-207 can also be used to adjust a tuner to match your antenna without the need for transmitting. The frequency coverage for the MFJ-207 is from below 1.75 MHZ to Above 30 MHZ in 5 user selectable bands.
MFJ-207 Instruction Manual HF 10-160M SWR Analyzer SYSTEM CONTROLS AND INDICATORS Front Panel Jacks and Controls 1 2 3 4 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. 3. Tune Control: This variable capacitor instantly sweeps across the desired band to find that SWR fast and easy. 4.
MFJ-207 Instruction Manual HF 10-160M SWR Analyzer SYSTEM CONTROLS AND INDICATORS End Panel Jacks FIGURE 2: End Panel Jacks 1. ANTENNA: This SO-239 Antenna connector allows you to easily hook up your station’s antenna to the MFJ-207. 2. FREQ. OUT: For additional accuracy you can hook up a frequency counter to this phono connector or feed the signal over a short piece of wire to your radio and zero beat against your radio as described in Appendix A. 3. PWR: This 2.
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. The Band Switch progressively shorts out the inductors as the frequency range is increased. The RF is then passed to Q3 and amplified.
MFJ-207 Instruction Manual HF 10-160M SWR Analyzer EASY START INSTRUCTIONS 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.
MFJ-207 Instruction Manual HF 10-160M SWR Analyzer EASY START INSTRUCTIONS II. HOW TO MEASURE THE FREQUENCY AT WHICH THE ANTENNA HAS THE LOWEST SWR. 1. Connect the antenna as discussed in step I, 1 or 2. 2. Turn the BAND switch to the appropriate band. 3. Adjust the TUNE control throughout its range until the SWR meter reads its lowest value. Record the frequency on the frequency meter. Record the SWR on the meter. For added frequency accuracy hook up a frequency counter or refer to Appendix A. 4.
MFJ-207 Instruction Manual HF 10-160M SWR Analyzer EASY START INSTRUCTIONS IV. Using the MFJ-207 to adjust an antenna tuner. 1. Connect you antenna to your antenna tuner. 2. Connect the MFJ-207 to the antenna tuner’s TRANSMITTER connector using a 2-3 foot length of RG-58 or RG-8. For ease of use see figure 4. 3. Turn the band switch to the appropriate band. 4. Set the frequency dial to the desired operating frequency. Adjust the tuner’s controls until the MFJ-207 indicates 1:1 SWR (nulls). 5.
MFJ-207 Instruction Manual 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. IF THE TRANSMITTER INPUT IS ON B, THEN TRANSMIT ONLY WHEN THE COAX SWITCH IS IN POSITION B. IF THE TRANSMITTER INPUT IS ON A, THEN TRANSMIT ONLY WHEN THE COAX SWITCH IS IN POSITION A.
MFJ-207 Instruction Manual HF 10-160M SWR Analyzer EASY START INSTRUCTIONS FACTS ABOUT TRANSMISSION LINES AND LINE LOSS The MFJ-207 should be connected to the input to the transmission line looking toward the load. You do NOT have to know the length in wavelength of your transmission line, but you do need to know the length in feet (or meters) and the loss (in db) for the length of line that you are using at the frequency you are testing.
MFJ-207 Instruction Manual HF 10-160M SWR Analyzer Figure 5: MFJ-207 Schematic Diagram
MFJ-207 Instruction Manual HF 10-160M SWR Analyzer APPENDIX A HOW TO ZERO BEAT THE MFJ-207 AGAINST THE RECEIVER The Freq. Out jack on the MFJ-207 has a sine wave output which can be used to accurately check the frequency at which the MFJ-207 is adjusted to. To zero-beat against the receiver, loosely couple a wire from the RCA jack (Freq. Out) to the antenna connector on your radio. First, try a small length of wire from the Freq. Out connector of the MFJ-207.
MFJ-207 Instruction Manual HF 10-160M SWR Analyzer APPENDIX B FREQUENCY/SWR PLOTTING CHART
MFJ-207 Instruction Manual HF 10-160M SWR Analyzer APPENDIX C SWR at Transmitter Vs.
MFJ-207 Instruction Manual HF 10-160M SWR Analyzer TECHNICIAL ASSISTANCE IN CASE OF DIFFICULTY [ ] Unit will not turn on – Ensure you have a fresh battery in the unit or your power supply is plugged in all the way to the unit. [ ] Unit drifts excessively – This is normally caused by low battery voltage. Replace the battery with a fresh battery. [ ] Meter never moves off full scale – Ensure your antenna is properly connected to the unit.
MFJ-207 Instruction Manual HF 10-160M SWR Analyzer
MFJ-207 Instruction Manual HF 10-160M SWR Analyzer FULL 12-MONTH WARRANTY 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. 1.
