MFJ MFJ-971 Bedienungsanleitung

MFJ-971 QRP PORTABLE ANTENNA TUNER

GENERAL DESCRIPTION: The MFJ-971 is a compact 200-Watt portable tuner

compatibly packaged with. MFJ QRP transceivers. The MFJ-971 is also a

perfect mate for any of today's ultra-compact SSB radios. It provides

a convenient cross-needle type SWR/Wattmeter and features a special

user-selectable 6-Watt range for QRP operation.

The T-match tuner covers 1.8-30 MHz and tunes almost any coax, wire, or

balanced-feed type antenna (a 4:1 toroid balun is built in for balanced

line).

READING THE CROSS NEEDLE SWR INDICATOR: The MFJ-971 uses a cross-

needle style meter to display FORWARD power, REFLECTED power, and SWR

simultaneously. To read Forward Power, observe the FORWARD meter

scale. To read Reflected Power, observe the REFLECTED meter scale.

To read SWR, observe where the two needles cross. The corresponding

red curve on the meter face displays your SWR reading. No "zero" or

"sensitivity" adjustment is required with cross-needle SWR displays.

POWER LEVELS: The FORWARD scale is calibrated from 0-300 Watts and

the REFLECTED scale from 0-60 Watts. In the high-power range, read

both scales directly (x 1). In the 30 Watt range, move the decimal

point one place to the left (x 0.1).

For QRP sensitivity (6-Watts FORWARD, 1.2-Watts REVERSE), you must

perform a simple conversion to obtain actual power. You can convert

in your head by moving the decimal point two places to the left and

doubling the reading (ie. 300 W = 3.00 x 2 = 6 W). You may also multiply

the scale reading times 0.02 on a pocket calculator -- or use this

conversion chart:

FORWARD SCALE

300W 30W QRP REFLECTED SCALE

60W 6W QRP

----------------- ----------------

300W 30W 6W 60w 6w 1.2W

250W 25W 5W 50W 5W 1.0W

200W 20W 4W 40W 4W 0.8W

150W 15W 3W 30w3W 0.6W

100W 10W 2W 20W 2W 0.4W

50W 5W 1W 10W 1W 0.2W

SELECTING POWER RANGE: The "IN" position of the meter's range

switch selects the 30-W range. The "OUT" position provides a choice

of 300-W or 6-W QRP range, as determined by two jumpers on the

powermeter pc board (see Figure 1A,1B). When jumper plugs are

installed in position "A", meter sensitivity is 6-Watts (QRP). When

installed in position "B", sensitivity is 300-Watts. Jumpers are

normally set for "B" (High Power) at the factory.

CAUTION: Running high power while in the "QRP" range could damage your

meter movement.

INSTALLING YOUR TUNER: The MFJ-971 tuner may be stacked with a

companion MFJ transceiver and power pack, or used separately.

Two brackets and 8 screws are included in this package to connect

the tuner to the MFJ transceiver and power pack if you choose to do

so. Locate your tuner to prevent accidental contact with connectors

on the rear panel; even low-power radios can cause serious RF burns

when fed into a random wire antenna. The tuner meter lamp may be

powered from any 12-VDC source. Use a 5.5mm x 2.1mm coaxial plug;

center pin positive (+).

TUNER CONNECTIONS: Set up your MFJ-971 as follows:

1. Connect radio to the SO-239 connector marked TRANSMITTER. 2.

Connect antenna feed to the appropriate tuner output:

(a.) COAX-FEED to the SO-239 connector marked ANTENNA.

(b.) RANDOM WIRE to the red binding post below ANTENNA jack.

(c.) BALANCED FEEDERS to the BALANCED binding posts.*

* WHEN USING BALANCED FEEDLINE, CONNECT A SHORT JUMPER FROM THE

LOWER "BALANCED" BINDING POST TO THE RED "ANTENNA" BINDING POST.

This routes the balun's unbalanced output to the tuner circuit.

3. Connect your tuner and transmitter to a good earth ground.

CAUTION: For reasons of safety and radiation efficiency, random wire

antennas should be high, clear of obstructions, and at least 1/4

wavelength long. They should also be well insulated from humans,

animals, vegetation, and grounded objects.

OPERATING YOUR TUNER: If your radio has tube finals, set the

transmitter on-frequency and "tune up" into a 50-Ohm resistive load.

Once this is done, leave your TUNE and LOAD controls set and

connect the tuner. If your radio has solid-state finals, omit this

step (it is already matched to-a 50-Ohm non-reactive load).

1. REDUCE TRANSMITTER OUTPUT before making initial adjustments.

2. Set tuner's TRANSMITTER and ANTENNA controls at 12:00 (3-1/2). 3

Switch INDUCTANCE for loudest receiver background noise.

4. Transmit a steady carrier (at low power), alternat=ely

adjusting TRANSMITTER and ANTENNA controls for minimum SWR.

NOTE: Since these controls interact, try moving the TRANSMITTER

control a small increment, then rotate the ANTENNA control for

minimum SWR. Repeat until you obtain the lowest SWR possible.

5. If you cannot obtain a 1:1 match, increase or decrease

INDUCTANCE and repeat step 4. Also, if RF arcing occurs

inside the tuner, change INDUCTANCE and repeat step 4).

6 Wh fi d i i SWR t t itt t f ll

The MFJ-971 should reduce the SWR of most feed systems to 1:1.

If you cannot achieve 1:1, try increasing or decreasing the length of

your antenna. Also, you may find minimum SWR occurs at more than

one combination of control settings. To confirm you have selected

the BEST one, check your RF power output (Po). If output appears

abnormally low, try another INDUCTANCE position and repeat step 4.

Finally, if your are using the MFJ-971 for receive only, tune as

described in steps 2-3.

IN CASE OF TROUBLE: Your MFJ-971 is backed by our "No Matter What

(TM)" guarantee for one full year. If you have a problem with your

tuner, first carefully inspect interconnecting cables and antenna

leads for shorts or opens (use an Ohm-meter . If unable to solve your

problem, call 1-800-647-TECH for assistance.

TO SET QRP JUMPER POSITIONS (Figure 1A):

Place plugs on headers in position "A" for 6-Watt sensitivity. TO

SET HIGH

POWER JUMPER POSITIONS (Figure 1B):

Place plugs on headers in position "B" for 300-Watt sensitivity.

CAUTION: Do not attempt to operate a high-power transmitter into your

MFJ-971 tuner when QRP meter sensitivity is selected. The meter

movement could be physically damaged.

WARNING: CONSTRUCTING OR ERECTING AMATEUR RADIO ANTENNAS IN

LOCATIONS WHERE THEY MAY COME INTO CONTACT WITH ELECTRICAL POWER

LINES MAY RESULT IN ACCIDENTAL INJURY OR DEATH. ALWAYS USE CAUTION.

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