MFJ MFJ-949C User manual

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MFJ-949C VERSA TUNER II
MODEL
MFJ-949C
OWNER’S
MANUAL
CAUTION: Read All Instructions Before Operating Equipment.
MFJ
ENTERPRISES,
INC.
P. O. BOX 494, MISSISSIPPI STATE, MS. 39762, USA
(-\
BO,
RPRISES, INC
RRR ALLY RIES TM
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MFJ-949C_ DELUXE VERSA TUNER II INSTRUCTIONS
GENERAL INFORMATION e@
The MFJ-949C is designed to match virtually any transmitter to al-
most any antenna, including dipoles, inverted vees, verticals, mobile
whips, beams, random wires, and others fed by coax lines, balanced
lines, or a single wire. A 1:4 balun is built in for connection to
balanced lines. An sSntenna selector switch provides versatile antenna
selection. A 50 ohm dummy load is built in for easy transmitter tuning.
The MFJ-949C will handle up to 300 watts of RF output power from the
transmitter from 160 through 10 meters. The MFJ-949C employs a cross
needle meter so forward power, reflected power, and SWR can be read
simultaneously.
THE SWR/WATTMETER
The meter on the MFJ-949C can be used with the tuner or by it-
self. To use the meter without the tuner, set the ANTENNA SELECTOR
to Coax 1 Direct or Coax 2: Direct. The MFJ-949C utlilizeswamc losses
meter so FORWARD power, REFLECTED power, and SWR can pie multane-
ously. The range for both FORWARD and REFLECTED power is either 30
watts or 300 watts. <it willl read SWR of 2 1sto >:
To read transmitter RF output power, set the desired range of either
30 watts or 300 watts. Transmit a steady carrier and read the FORWARD
power on the FORWARD scale and the REFLECTED power on the REFLECTED
scale. SWR is indicated by the crossing point of the two needles.
While transmitting, read SWR from the,SWR line nearest the crossing &
point. The» meter-lamp can be power, by a 12V DC source. Use a)255mm
plug with the tip of the plug connected to the positive.
The ANTENNA SELECTOR switch alows selecting two coax antennas
either direct/of through the tuner, a balanced line atnenna or wire
antenna or a built-in 50 ohm dummy load. The 50 ohm dummy load
is rated at 300 watts. CAUTION: DO NOT continously key for more than
2 minutes at a time. DO NOT operate the antenna switch while trans-
mitting. DO NOT use the MFJ-949C for over 300 watts of RF output
power, even in the Direct Coax or Dummy Load positions.
INSTALLATION
Ie. Install the MFJ-949C between the transmitter and the antennas.
A coax line is connected to the transmitter andthe 50-27 > 7coax
connector marked TRANSMITTER on the tuner.

I4e One or two coax fed antenna may be connected to the SO-239
EVakeCOnneet Ot SemMaGKxeds COaxs @andsGoaxne .SyiNOTE:97 Coax 7
and Coax 2 antennas can be connected directly to the
transmitter, amd by-passing the tuner by setting ANT. Sel-
ector to Coax, 13 Diréct orWCoax 2; Direct, respectively.
Sc. A random wire antenna may be connected to the five-way
binding post marked WIRE. The random wire should be long,
high, and as clear of surrounding objects as possible.
For optimum operation, length of random wire antenna sho-
Pideoey judrter wave, Ore longex’ Ofethes operating, frequency.
Do not ground the random wire antenna. Make sure that
the tuner is well grounded to the transmitter. A £ive-
way binding post marked GROUND is provided for ground
connection.
4. A balanced line fed antenna may be connected to the two
five-way binding posts marked BALANCED LINE. A jumper
wire from the WIRE binding post, as indicated by a dotted
line on the MFJ-949C, should be connected to one of the
postS of the BALANCED LINE. This couples the MFJ-949C to
mene bavanced=-Line through: “asls4 balun.
NOTE: Either a balanced line or random wire antenna can
be connected at one time. If a random wire antenna is
used, make sure that there is not a jumper wire between
WIRE and BALANCED LINE.
USING ELHE, ME =949C
The INDUCTOR switch on the MFJ-949C represents a minim-
um Of inductance at positionA and a maximum of inductance at
position bo Less inductance is needed at high frequencies
than at low frequencies for the same impedgnce. The TRANS-
MITTER and ANTENNA controls both represent a maximum of cap-
fetcance at position 6. For optimum operation of the MFJ-949C,
BeaecmeLaisiitter must be Luned for a 50 ohm output impedénce
POLetnewrrequency band in Operation. Set ANT. SELECTOR switch
BomvUMNnyeuOdC LOG Luning up the transmitter.
NOTE: Always tune the transmitter at a low output power.
Pape te puOpecmlyecuning Lhe transmitter, set Antenna
Selector to the desired antenna and tune the tuner for a
minimum SWR as descitbed below. DO NOT readjust the trans-
Names Get OadCdanGgecOnLr1Ol Setting aiter loading it to the 50
ohm load.
de Seueunew RANSMELIER and ANTENNA controls to 3.5 (The
Sapdeteorewate sical)! -Opened )’.
2 Rotate the INDUCTOR control until maximum noise is ob-
Tainead With your transceiver in the receiving mode.
ShA Witeremeransttt tind and wath the INDUCTOR control set the
same as for step 2, alternately adjust the TRANSMITTER
and ANTENNA controls for a minimum SWR. Since the TRANS-

-MITTER and ANTENNA controls interact, the two controls
can best be adjusted by turning the TRANSMITTER control
a small increment at a time and the rotating the ANTENNA
control for the minimum SWR. Repeat this until a minimum
SWR is obtained.
If a SWR reading of 1:1 is not achieved, increase or de-
crease the INDUCTOR control or position and repeat Step
32° CAUTION: “If” arcing” betweenscapaci tor spdates occunss
increase or decrease the INDUCTOR control one position
and repeat’ Step 3. “NOTE: If a SWR 1:1 cannot be achieved
at this point, repeat Step 3 for each INDUCTOR control
position. Again, -do this in the tune mode or, at.a.low
transmitter power.
After a minimum SWR is achieved, the transmitter power
may now be. increased’ up to 300-watts. @Thisstiuner wile
reduce the SWR of; most -antenna Systems: to nearlyeises.
However in some cases a 1:1 SWR may not be achievable.
If this happens, try increasing or decreasing length of
antenna. Note that a 1.5:1 SWR results only in 4% re-
flected power and 11% reflected power with a SWR of 2:1.
A SWR of 1:1 can occur from more than one = seteon, contnon
settings on the MFJ-949C. When a SWR of 1:1 is obtained,
be sure to check the transmitter power and make sure that
the transmitter power is relatively high. If the trans-
mitter power has decreased substantially, try another
INDUCTOR control setting and repeat Step 3.
When using the MFJ-949C for receiving only, tune the
MFJ-949C as described in Step 1 and Step2.

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FULL 12 MONTHS 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 N‘FJ
Enterprises, Inc. to be free of 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. The purchaser must retain the dated proof-of-purchase (bill of sale, cancelled check,
credit card or money order receipt, etc.) describing the product to establish the va-
lidity of warranty claim and must submit the original or a machine-reproduction of
such proof-of-purchase to MFJ Enterprises, Inc. at the time of warranty service.
MFJ Enterprises, Inc. shall have the discretion to deny warranty without dated
proof-of-purchase. Any evidence of alteration, erasure, or forgery of proof-of-purchase
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ee shall be cause to void any and all warranty terms immediately. ——
_o 2. MFJ Enterprises, Inc. agrees to repair or replace at MFJ’s option without charge to —
= the original owner any defective product provided the product is returned postage ‘(<5
prepaid to MFJ Enterprises, Inc. with a personal check, cashier’s check or money ae
a. order for $4.00 covering postage and handling. 7
Ss 3. MFJ Enterprises, Inc. will supply replacement parts free of charge for any MFJ pro- <=
duct under warranty upon request. A dated proof-of-purchase and a $4.00 personal »<= >
check, cashier’s check or money order must be provided to cover postage and —
handling.
——
= 4. This warranty is NOT void for owners who attempt to repair defective units. Techni- —
= cal consultation is available by calling [phone]. —
5. This warranty does not apply to kits sold or manufactured by MFJ Enterprises, Inc. ——
= 6. Wired and tested PC board products are covered by this warranty provided only the —
wired and tested PC board is returned. Wired and tested PC boards installed in ‘(<>
the owner’s cabinet or connected to switches, jacks, cables, etc. sent to MFJ Enter. = 5—
prises, Inc. will be returned at the owner’s expense unrepaired.
— 7. Under no circumstances is MFJ Enterprises, Inc. liable for consequential damages to
= person or property by the use of any MFJ product.
—) 8. Out-of-Warranty Service: MFJ Enterprises, Inc. will repair any out-of-warranty pro-
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duct provided the unit is delivered prepaid. All charges will be shipped COD to the
owner.
9. This warranty is given in lieu of any other warranty express or implied.
10. MFJ Enterprises, Inc. reserves the right to make changes or improvement in design
or manufacture without incurring any obligation to install such changes upon any of
the products previously manufactured.
11. All MFJ products to be serviced in-warranty or out-of-warranty should be addressed
to MFJ Enterprises, Inc., 921A Louisville Road, Starkville, Mississippi 39759, USA
and must be accompanied by a letter describing the problem in detail along with a
copy of your dated proof-of-purchase.
. This warranty gives you specific rights, and you may also have other rights which
vary from state to state.
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