MFJ-860 SWR/Wattmeter Instruction Manual
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MFJ-860 HF SWR/Wattmeter
The MFJ-860 HF SWR/Wattmeter measures forward and reflected power and indicates
SWR for the ham bands from 160 meters to 6 meters. The MFJ-860 has 2 power scales
which are selected with the front panel push button switch. The low power scale reads
from 0-30 watts forward and 0-6 watts reflected. The high power scale reads from 0-300
watts forward and 0-60 watts reflected. SWR is indicated from 1:1 to ∞.
Connections
Connect your transmitter to the connector labeled "TRANSMITTER" and your antenna to
the connector labeled "ANTENNA". It is important that you use good quality coax and
properly installed connectors.
If you want to measure the power output capability of a transmitter/amplifier you should
connect a quality dummy load (50 ohms) to the antenna jack of the MFJ-860.
Caution: many HF dummy loads exhibit SWR especially on 15 and 10 meters.
The MFJ-860 has an illuminated meter. To
provide power for the meter lamp, a 12 Vdc
supply such as the MFJ-1312B should be used.
Use a standard 2.1 mm coaxial plug with the
center conductor positive and the sleeve ground.
Using the MFJ-860
To measure forward and reflected power press the selector switch to the correct power
setting. Transmit a steady carrier and read the power from the meter. Each unmarked
picket on the scale is an even division between the adjacent marked values. SWR is read
from the SWR curve closest to where the meter needles cross.
If a more exact reading of SWR is needed you may
use the equation for SWR. Measure the forward
and reflected power then put the values into the
following equation.
SWR = 1+
Pr = Reflected Power
Pf = Forward Power
G
H
Pr
Pf
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1-
G
H
Pr
Pf
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MFJ-860 SWR/Wattmeter Instruction Manual
Parts List
Designator Part Number Description
R1, R2 100-0003
R3, R6 133-4100
R4, R5 133-5100
R7 101-1680
R8 100-3330
C1-C4 200-0004 Capacitor, Disc Ceramic, 25/50v, 20%, .01 uF
C5 200-0010 Capacitor, Disc Ceramic, 50V, 20%, 220 pF
C6 204-0001 LLT, Capacitor, Trimmer, 250V,3-10 pF
L1 401-0037 Inductor, Molded, .3", 10%, brn-blk-gld, 1.0uH
D1-D2 300-2835 Diode, Schottky, HP2835
for M1 715-6186 Spacer, Aluminum, Hex, 4-40-1/4"L, .25" Od, Plain
for M1 710-6050 Washer, Metal, Lock Washer, #6 Id, Int. Tooth
for M1 700-2221 Screw, Machine, Pan, Phillips, 4-40-1/4", St, BK
for M1 736-0100 Bracket, Tab, Meter,
J1, J2 610-2005 Connector, UHF, 4-Hole Mount, SO-239
J3 601-6121 Jack, Coaxial, 2.1mm, Ch. Mt., Closed, Mono
M1a&M1b 400-3084 Meter, Cross Needles, 200uA, 1200 Ohm, 300W
Resistor, 1/4 Watt, 5%, Film, 100 Ω
Resistor, Trimpot, Sub. Horz., 10 kΩ
Resistor, Trimpot, Sub. Horz., 100 kΩ
Resistor, 1/2 Watt, 5%, Film , 68 Ω
Resistor, 1/4 Watt, 5%, Film, 3.3 kΩ
Schematic
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MFJ-860 SWR/Wattmeter Instruction Manual
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.
The purchaser must retain the dated proof-of-purchase (bill of sale, canceled check, credit
card or money order receipt, etc.) describing the product to establish the validity of the
warranty claim and submit the original of machine reproduction or 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 shall be cause to void any and all warranty terms
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
immediately.
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 prepaid to
MFJ Enterprises, Inc. with a personal check, cashiers check, or money order for
$7.00
covering postage and handling.
MFJ Enterprises, Inc. will supply replacement parts free of charge for any MFJ product
under warranty upon request. A dated proof of purchase and a
$5.00
personal check,
cashiers check, or money order must be provided to cover postage and handling.
This warranty is
NOT
void for owners who attempt to repair defective units. Technical
consultation is available by calling (601) 323-5869.
This warranty does not apply to kits sold by or manufactured by MFJ Enterprises, Inc.
Wired and tested PC board products are covered by this warranty provided
wired and tested PC board product is returned.
Wired and tested PC boards installed
only the
in the owner's cabinet or connected to switches, jacks, or cables, etc. sent to MFJ
Enterprises, Inc. will be returned at the owner's expense unrepaired.
Under no circumstances is MFJ Enterprises, Inc. liable for consequential damages to
person or property by the use of any MFJ products.
Out-of-Warranty Service:
MFJ Enterprises, Inc. will repair any out-of-warranty product
provided the unit is shipped prepaid. All repaired units will be shipped COD to the
owner. Repair charges will be added to the COD fee unless other arrangements are made.
This warranty is given in lieu of any other warranty expressed or implied.
MFJ Enterprises, Inc. reserves the right to make changes or improvements in design or
manufacture without incurring any obligation to install such changes upon any of the
products previously manufactured.
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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