MFJ MFJ-207 Manuel utilisateur

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

Model MFJ-207

VERSION 0B

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.

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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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. SWR AT ANTENNA 16

LIST OF FIGURES

Figure 1 Front Panel Jacks and Controls 5

Figure 2 End Panel Jacks 6

Figure 3 BlockDiagram 7

Figure 4 MFJ-207 to Tuner Hook Up 10

Figure 5 Schematic Diagram 13

MFJ-207 Instruction Manual HF 10-160M SWR Analyzer

INTRODUCTION:

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.

FEATURES

Portable – The MFJ-207’s light weight, small size and internal battery capability makes it great for Field Day,

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.

Stable – With built in AGC the MFJ-207 is accurate across the bands. No false readings.

Rugged Construction: Attractive all-metal cabinet, conservative component selection and extensive RF

filtering ensure solid performance for years to come. Fully covered by MFJ’s “No Matter What” one year

limited warranty.

Before attempting to operate your MFJ-207, please read the manual thoroughly. It contains important detail

about setting up your unit to obtain the best performance.

USES FOR THE MFJ-207 HF 10-160M SWR ANALYZER

Your MFJ-207 SWR ANALYZER has many uses. It can be used to find the resonant frequency of your

antenna, to find the SWR of your antenna at a particular frequency, and to find the frequency at which your

antenna has the lowest SWR. You can also use the SWR Analyzer to adjust your antenna to a low SWR and to

adjust an antenna tuner to match the transmitter to your transmission line. You can even find out if your

antenna is resonant on more that one frequency.

Measurement of the antenna’s SWR is done right at the input to the transmission line. There is no need to

climb the tower and measure the SWR at the antenna. Also handy for suspended dipoles. Using the chart in

Appendix C and knowing the line loss for your transmission line and the SWR at the line input, you can

determine the SWR at the antenna, regardless of line length.

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. SWR Meter: Direct readout of your SWR from 1:1 to Infinity.

Frequency Coverage of the Bands

NOTE: The frequency coverage may vary slightly from this chart and the label on the cover of the unit and is

for reference only. A frequency counter can be connected to the Freq. Out connector shown in Figure 2 to get a

more accurate reading of the frequency. As an alternative to a frequency counter you can Zero Beat the output

with an HF receiver. See Appendix A.

BAND A: 1.40 - 2.50 Mhz

BAND B: 2.40 - 4.50 Mhz

BAND C: 3.90 - 7.20 Mhz

BAND D: 7.00 - 14.00 Mhz

BAND E: 14.00 - 31.00 Mhz

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 2.1 mm jack allows you to attach a MFJ-1312D AC adapter or feed

power from your station supply.

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. This RF is sensed by D2 and the resulting voltage is fed to U2 where it is

amplified and fed to Q4. Q4 varies the voltage on the source of Q1 and Q2 maintaining the stable RF level.

The Rf then goes to the bridge consisting of three fixed legs consisting of 49.9 Ohm resistors R7, R9 and R21.

The 4th leg of the bridge is the unknown leg which is the Antenna input to the unit. When the bridge is

unbalanced then D1 rectifies the unbalanced voltage and this is amplified by U2 and deflects the meter.

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.

To install the battery, remove the screws holding the cover onto the case. Insert the battery into the

battery holder. Tuck the battery snap wires out of the way so they do not interfere with the tuning capacitor

rotation. Reinstall the cover and screws.

I. HOW TO MEASURE THE ANTENNA’S SWR AT A PARTICULAR FREQUENCY.

1. To check the SWR of your antenna, connect the antenna with a PL-259

connector to the ANTENNA connector on the MFJ-207.

2. If you are using open-wire feedline wire then first you must wire your feedline

to a PL-259 connector and then attach it to the ANTENNA connector of the MFJ-207.

3. Set the BAND switch to the appropriate band.

4. Adjust the FREQUENCY DIAL of the SWR ANALYZER to the frequency at

which you want to check the SWR. For added accuracy connect a frequency

counter to the Freq. Out jack or zero beat against your receiver as described in

Appendix A.

5. Read the SWR from the meter. This is the SWR at the INPUT TO THE

TRANSMISSION LINE looking towards the load (antenna). To determine the

SWR at the antenna refer to Figure **.

6. If the SWR at the SWR Analyzer is 1:1 then the SWR at the antenna is 1:1 at

the selected frequency.

7. Using steps 1 through 5, you can make a plot of the SWR verses

FREQUENCY for your antenna. Just plot the SWR at many different

frequencies. Appendix B shows a SWR vs. FREQUENCY plotting chart. We

suggest you make several copies of the chart so you can use it for several

antennas.

NOTE: It is advisable to take reading on several different bands to determine the frequency at

which the lowest SWR occurs. The SWR can be low at several different frequencies, but there

should only be one frequency that shows the LOWEST SWR. That frequency will be the natural

resonant frequency of that antenna.

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. If you do not obtain a low SWR on any frequency, turn the Band switch to

another band and repeat steps 1-3 above. Don’t be surprised if your antenna

does not show a 1:1 SWR on any frequency. Many antennas can be tuned to

obtain a 1:1 SWR, but will never show a 1:1 SWR without an antenna tuner.

III. Adjust the Antenna for 1:1 SWR.

1. Again connect the antenna as discussed in step I, 1 or 2.

2. Turn the BAND switch to the appropriate band.

3. Turn the Frequency TUNE knob until the pointer is on the frequency at which

you want to tune the antenna.

NOTE: For accuracy, use a frequency counter attached to the FREQ. Output on the SWR

analyzer or zero-beat against your receiver. See Appendix A.

4. Read the SWR on the meter. If the meter reads other than 1:1 SWR then

adjust your antenna until the antenna read 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. If the resonant frequency is higher

than you want then the elements are too short.

HINT: If you are adjusting an antenna for the first time, it is recommended that you start

with elements a little too long, then shorten to resonance. Again the SWR for

your particular antenna may never get as low as 1:1. Always adjust for the

lowest reading.

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