MFJ Antenna tuners etc.

The tuners by MFJ (USA) are powerful products, combining solid construction with useful functions and ease of use. And these products are affordable!
Most of the tuners shown here are suitable for a frequency range from 1.8 to 30MHz, some units also cover 6m.

MFJ-939 Fast Automatic Tuner New

MFJ-939 Tuner

Fast automatic antenan tuner with wide tuning range.

The MFJ-939 automatic antenna tuner is shipped with control cable suitable for various radios of a manufacturer, depending on model. This greatly simplifies the operation, because you need only to press the 'Tune' button on the radio. [1]. The '939' is characterised by a very wide tuning range from 6 to 1600 Ω. This is much more than most internal tuners can offer. The large tuning range is provided by a large number of capacitors and inductivities, which results in a very precise tuning using 256 combinations of C and L each.

By using more than 2500 memories the tuner offers a very fast tuning, because once found combinations of L and C are stored for each frequency, instead of calculating the combination each time again. And the tuner offers various acoustic and optical protection signals and diagnostics, for example against hi SWR or power input. In case of too much power on the input the tuner sends 'QRT' in telegraphy, an LED signals the error as well. But also in case of not enough power (2 W is minimum) the tuner sends 'QRO' in morse...

Another nice feature is the sleep mode of the tuner. In case no tuning has to be done and during RX, the tuner goes to sleep mode and turns off the microprocessor. This has the benefit of reducing power consumption as well as avoiding noise on HF. Further the MFJ-939 is prepared for the future - in case of a system change you can simply use a different control cable and continue to use the same tuner. MFJ offers various cables for different radios.

The maximal transmit power is 200 W SSB or CW. The industrial grade switching relays are rated for 1000V/10A. The minimum transmit power for tuning is 2W. Included in shipment is a control cable which is suitable for various or most radios of the selected manufacturer. In some cases the control cable is also used for the power supply from the radio, in other cases an external power supply is required (13.8V, 750mA).

MFJ-939 Model Overview
Model Control Cable incl.
in shipment
for transceiver
MFJ-939I MFJ-5114I All Icom with 4pin tuner socket
IC-703, IC-706, IC-718, IC-736, IC-746, IC-7400, IC-7410, IC-7600,
IC-756, IC-756Pro I/II/III, IC-765, IC-775, IC-7000, IC-7100 u.a.
MFJ-939K MFJ-5114K All Kenwood with 6-pin tuner socket
TS-50, TS-450, TS-480, TS-570, TS-590, TS-850, TS-950, TS-2000 u.a.
MFJ-939Y MFJ-5114Y FT-100, FT-450, FT-857, FT-897, FT-950

[1] Other transceivers can be used with other interface cables of type "MFJ-5114x". On some radios the tune mechanism is started from a push button on the tuner, not from the radio.

Technical Data MFJ-939
Tuning Range 6 – 1600 Ω
Tuning Range C 0 – 24 µH
Tuning Range L 0 – 3900 pF
Minimum TX power 2 W
Max. Power 200 W (SSB, CW)
Frequency Range 1.8 – 30 MHz
Operating Voltage 12 – 15 V
Max. current consumption 750 mA
Dimensions 165 × 54 × 210 mm
Weight 1 kg
Order No.
MFJ-939I Tuner Icom, incl. MFJ-5114I 199.00 € Buy now New
MFJ-939K Tuner Kenwood, incl. MFJ-5114K 199.00 € Buy now New
MFJ-939Y Tuner Yaesu, incl. MFJ-5114Y 199.00 € Buy now New
MFJ-5114I Icom Control Cable (as supplied with MFJ-939I) 29.00 € Buy now
MFJ-5114K Kenwood Control Cable (as supplied with MFJ-939K) 29.00 € Buy now
MFJ-5114Y Yaesu Control Cable (as supplied with MFJ-939Y) 29.00 € Buy now
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MFJ-993BRT, MFJ-994BRT, MFJ-998RT
Automatic Outdoor Antenna Tuners 300, 600, 1500W

MFJ-993BRT

These automatic tuners are suitable for coax or endfed antennas. The tuners are weatherproof and suitable for outdoor use. The max. transmit power is 300, 600 or 1500W, depending on model. All tuenrs tune antennas over the entire shorttwave range from 1.8 to 30MHz. The time to tune is max. 15 seconds, but usually as low as 5 seconds, because once found settings are stored in one of 10000 permanent memories.

The MFJ tuners works automatically, no manual tuning required. The tuning starts with a transmit power as low as 2 Watt (MFJ004BRT, other models require 5W), but 10 to 20 Watt are recommend for best results. The max. power while tuning should not exceed 20 Watt. Although the tuner is equipped with heavy duty 16A/1000V relays, they might be damaged when tuning at higher powers. The switched L network of the tuners allows up to 192 different L and 192 different C values, resulting in an impedance matching range of 12 to 800 Ω with the MFJ-994BRT, and 12 to 1600 Ω with the models MFJ-993BRT and MFJ-998RT.

MFJ-994BRT

These models are housed in a weatherproof outdoor box. The power supply is done over the coax feed, for that purpose a Bias-T MFJ-4117 is included in shipment. All tuners have PL sockets for the transceiver and the antenna, alternatively a wire post can be used for end-fed wires. For parallel wire fed antennas an external balun is required (not included).

Technical Data MFJ-993BRT, -994BRT, -998RT
MFJ-993BRT MFJ-994BRT MFJ-998RT
Impedance Range 12 - 1600 12 - 800 12 - 1600 Ω
Minimal Transmit Power 5 2 5 W
Transmit Power for Tuning 10 - 20 10 - 20 10 - 20 W
Max. Power 300 600 1500 W
Frequency Range 1.8 - 30 MHz
Tuning Range C 0 - 3908 0 - 2950 0 - 3926 pF
Tuning Range L 0 - 24 0 - 17 0 - 24 µH
Supply Voltage 12 - 15 V DC
Power Consumption max. 1.4 max. 0.85 max. 1.4 A
Dimensions 261 x 64 x 356 257 x 71 x 234 350 x 159 x 457 mm (BxHxT)
Weight 1.6 1.7 4.3 kg
MFJ-998RT
Order No.
MFJ-993BRT MFJ Automatic Outdoor Tuner 300 W 344.00 € Buy now
MFJ-994BRT MFJ Automatic Outdoor Tuner 600 W 459.00 € Buy now
MFJ-998RT MFJ Automatic Outdoor Tuner 1500 W 861.00 € Buy now
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MFJ-926B Automatic Outdoor Antenna Tuner 150W

The MFJ-926B is a very affordable automatic tuner for shortwave 1.6 to 30MHz, for feeding verticals, longwires, dipoles etc. Like the well known SG-230 this tuner is primarily intended to feed wire antennas or monopoles, the antenna connector is simply a high voltage connector. If you intend to connect coax just connect the shield to ground. The tuner has a tuning range of 12 to 1000 Ω, max. power load is 150W.

Once a setting has been found it is stored in non-volatile memory, so that a new tuning on similar frequencies happens very fast. The tuner uses a Pi network design which has the advantage (compared to L networks) that is acts as an additional low-pass filter, reducing spurious emissions.

The MFJ-926B tuner is operated with 12V DC, other cotrol wires are not required. The solid plastic case is suitable for outdoor use, size approx. 365x240x75mm. U bolts with 55 mm width are included. The minimal required antenna length is 2.5m for frequencies of 6MHz and up, or at least 8m for 1.8MHz and up. With a small glassfibre pole (not included) and some wires (not included) a good allband antenna is constructed within minutes.

Housed in a weatherproof outdoor box and is shipped with a Bias-T.

Order No.
MFJ-926B MFJ Automatik Outdoor Tuner 150 W 367.00 € Buy now
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MFJ-993B Automatic Antenna Tuner 300W


MFJ-993

The MFJ-993B is an automatic antenna tuner for coax- or parallel wire fed antennas. Integrated is a SWR and power meter, a switch for two antennas and a 4:1 balun. Impedance matching range is 6 to 1600 Ω from 1.8 to 30MHz. 2000 memory locations store once found settings, speeding up the tuning process when a frequency is later used again. Tuning starts automatically when transmit power is applied, manual tuning is also possible.
An analog meter shows SWR, further a LC display shows SWR, power, frequency and other information. Very useful for visually handicapped users is the acoustic feedback on SWR. Max. power load is 300 W PEP SSB, 150 W CW

The optional interface cable MFJ-5124I allow connecting the tuner to any Icom rig with the 4 pin tuner socket (e.g. IC-706, IC-7456Pro, IC-756Pro/2/3 and many more). Over this cable the tuner is controlled and supplied with power.
Equipment by Kenwood and Yaesu are connected with the cables MFJ-5124K (Kenwood) and MFJ-5124Y (Yaesu). Since these rigs require a somewhat more complex control the cables include an electronics component which makes them more expansive.


Remote Control MFJ-993RC

As an option a remote control MFJ-993RC is available for this tuner. This remote control allows the selection of the two antennas, manual tuning of L and C and of course the automatic tuning. Two LEDs show the status 'tuned' and 'hi SWR'. The MFJ-993RC comes with a 180cm long cable. This is a standard serial cable with 9 pin D-Sub male/female connectors. This cable can be extended to larger lengths. A maximum length is not specified by the manufacturer, but about 15 to 20m should be possible.

Order No.
MFJ-993B MFJ-993B Automatic Tuner 328.00 € Buy now
MFJ-993RC Remote Control for MFJ-993RC 56.40 € Buy now
MFJ-5124I Cable for Icom tuner interface 29.00 € Buy now
MFJ-5124K Cable for Kenwood 79.00 € Buy now
MFJ-5124Y Cable for Yaesu 79.00 € Buy now
MFJ-5124Y2 Cable for Yaesu FT-847 69.00 € Buy now
MFJ-5124Y4 Cable for Yaesu FT-2000 29.00 € Buy now
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MFJ-5124I (Icom)

MFJ-5124K (Kenwood)

MFJ-5124Y (Yaesu)

MFJ-929 Automatic, compact Antenna Tuner 200W

Bild MFJ-929

Similar to MFJ-993B, but only 200W, without cross-needle instrument.

Order No.
MFJ-929 282.00 € Buy now
MFJ-5114I Control cable for Icom 29.00 € Buy now
MFJ-5114K Control cable for TS-50,450,570,2000 etc. 29.00 € Buy now
MFJ-5114Y Control cable for Yaesu FT-817/857/897/100D 29.00 € Buy now
MFJ-5114Y2 Control cable for Yaesu FT-847 29.00 € Buy now
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  • MFJ-5124I Icom for all Icom radios with 4pin Tuner socket. That are practically all Icom HF radios of the past 25 years.
  • MFJ-5124K Kenwood for TS-50S, TS-450S, TS-480SAT, TS-480HX, TS-570S, TS-590S, TS-690S, TS-850S, TS-870S, TS-2000 and all Kenwood radios which support the tuners AT-300 or AT-50.
  • MFJ-5124Y Yaesu for FT-100D, FT-857, FT-897
  • MFJ-5124Y2 Yaesu for FT-847
  • MFJ-5124Y4 Yaesu for FT-2000/2000D
MFJ-5114I
MFJ-5114I (Icom)
MFJ-5114K
MFJ-5114K (Kenwood)
MFJ-5114Y
MFJ-5114Y (Yaesu)

MFJ-994B Automatic Antenna Tuner 600W

MFJ-994B

Similar to MFJ-993B, but up to 600 W PEP SSB, 300 W CW; no LC display, no acoustic SWR feedback, no antenna switch, no balun. Impedance range 12 to 800 Ω.

Order No.
MFJ-994B 443.00 € Buy now
MFJ-5124I Cable for Icom tuner interface 29.00 € Buy now
MFJ-5124K Cable for Kenwood 79.00 € Buy now
MFJ-5124Y Cable for Yaesu 79.00 € Buy now
MFJ-5124Y2 Cable for Yaesu FT-847 69.00 € Buy now
MFJ-5124Y4 Cable for Yaesu FT-2000 29.00 € Buy now
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MFJ-998 Automatic Antenna tuner 1500W

MFJ-998

Similar to MFJ-993B, but max. 1500 W SSB/CW. With cross needle instrument, with LC Display, without balun. Size 33x38x10cm, weight 3.5kg.

Order No.
MFJ-998 859.00 € Buy now
MFJ-5114I Control cable for Icom 29.00 € Buy now
MFJ-5114K Control cable for TS-50,450,570,2000 usw. 29.00 € Buy now
MFJ-5114Y Control cable for Yaesu FT-817/857/897/100D 29.00 € Buy now
MFJ-5114Y2 Control cable for Yaesu FT-847 29.00 € Buy now
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993/994/998 Comparision

  MFJ-929 MFJ-993B MFJ-994B MFJ-998  
Max. Power 200 W SSB PEP / 120 W CW 300 W SSB PEP / 150 W CW 600 W SSB PEP / 300 W CW 150 W SSB PEP / 1500 W CW  
Impedance range 6 - 1600 6 - 1600 12 - 800 12 - 1600 Ω
Frequency Range 1.8 - 30 1.8 - 30 1.8 - 30 1.8 - 30 MHz
# of antennas 2x coax or 1x coax + 1x wire 2x coax or 1x coax + 1x wire 1x coax or 1x wire 2x coax or 1x wire  
LC Display Yes Yes No Yes  
Cross needle instrument No Yes Yes Yes  
Audible SWR feedback Yes Yes No No  
No. of memories 2000 2000 2000 20000  
Remote connector Yes Yes Yes Yes  
Dimensions 165x70x190 254x70x230 254x70x230 330x380x100 mm
Power supply 12V / 1A 12V / 1A 12V / 1A 12V / 1.3A  
Control cable MFJ-5114x MFJ-5124x MFJ-5124x MFJ-5114x  
Price 282.00 € 328.00 € 443.00 € 859.00 €  

MFJ-974HB Tuner for symmetrical antennas



MFJ-974HB

The MFJ-974HB is a true "Balanced Tuner" for symmetrical feeder lines which offers an excellent current balance. Tuning range 12 to 2000Ω, frequency range from 1.8 to 54MHz, of course incl. all WARC bands. Max. power 300 W PEP SSB, 150 W CW. Tuning is easy with three tuneable elements, selectable circuit "Q" for efficient tuning at high bandwidths or extreme loads. Includes large, backlit cross-needle instrument (selectable 30/300W) which facilitates tuning, it shows SWR, return power and output power. Size 19 x 15 x 20 cm.

Order No.
MFJ-974HB Balanced Tuner 160-6m 265.00 € Buy now
MFJ-974B Balanced Tuner 80-6m 239.00 € Buy now
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AMERITRON ATR-30 3000 watt tuner with roller inductor

ATR-30

This tuner with roller inductor of AMERITRON is designed for outputs up to 3kW in the entire shortwave range from 1.8 to 30MHz.

2 capacity with 500 pF provide a very large tuning range. AMERITRON himself says that these capacities are the largest in commercially manufactured tuners. A translation of 6:1 allow a very sensitive and accurate tuning.
The roller inductor is thick, silver-plated copper ribbon. This creates a large surface area, which is also resistant to high currents. The built-in counter and the large crank helps you to find the right settings quickly.

A built-in balun with 3 stacked cores allows to connect a ladder line or a simple wire directly to the tuner. Also there is a watt meter with PEP display on board. SWR and output power are displayed during transmission on the illuminated cross-needle instrument.

Order No.
ATR-30 AMERITRON ATR-30 3kW Tuner 765.00 € Buy now
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MFJ-962D 1500 Watt Tuner with roller coaster coil


MFJ-962D
This tuner closes the gap between 300 W and the large 3KW units.
Tunes 1.8 to 30MHz, roller coaster coil with digital readout, 6 pos. antenna switch, integrated 4:1 balun for symmetrical antennas. Dimensions 25 x 25 x 10cm.


Start now with the usual 100W, upgrade later to a power amplifier but stay with the same tuner. The MFJ-962D tuner takes max. 1500 W PEP SSB, offering enough reserves for legal limit use (in EU). A wide matching range allows operation on any shortwave band from 1.8 to 30MHz. Offers an antenna selector for two coax- and one wire-fed antenna, illuminated cross needle instrument. The precisely machine roller coaster coil with digital readout and the two large var. capacitors allow evry fine tuning for best SWR.
Order No.
MFJ-962D 385.00 € Buy now
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MFJ-902B compact tuner

MFJ-902

MFJ-902B compact tuner
Very small tuner without SWR meter, suitable for any rig with built-in SWR meter like IC-706, FT-8x7, FT-100 etc. Tunes 6 to 80m, max. 150W, with bypass switch. Dimensions 112 x 57 x 75mm.

Order No.
MFJ-902B 142.60 € Buy now
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MFJ-904H Compact tuner with SWR meter

The MFJ-904H is the same as the MFJ-902 but includes a Cross-Needle SWR/Wattmeter and 4:1 balun for balanced lines and random wire. Cross-Needle meter shows SWR, forward, and reflected power all at a glance. Push button selects forward/reflected power in 150/60 and 15/6 Watt ranges. Measures a compact 7¼ x 2¼ x 2¾ inches.

Order No.
MFJ-904H 186.30 € Buy now
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MFJ 949 E / MFJ 948 - our bestsellers!

MFJ-948

MFJ-948
MFJ-949E

MFJ-949E

300 Watt PEP, 300 Watt dummy load integrated.Cross needle instrument show forward and reflected power. Diemensions: 27 x 9 x 18cm

  • PEP power measurement
  • 6 position antenna selector
  • Integrated balun 4:1 parallel wire feeds
Order No.
MFJ-949E 229.00 € Buy now
MFJ-948 like MFJ949E but without dummy load 206.00 € Buy now
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MFJ- 941E - worldwide bestseller

Bild MFJ-941E

MFJ-941E

300 W PEP, two position antenna selector, integrated 4:1 balun for parallel wire feed. Includes cross needle meter! Dimensions 27 x 7.5 x 18m

Order No.
MFJ-941E 195.00 € Buy now
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MFJ-945E - Mobile tuner- incl. 6 m Band

MFJ-945E

MFJ-945E

300 Watt PEP, very small: 20 x 5 x 15cm. Built-in cross needle instrument, low losses due to use of an aircore coil.

Order No.
MFJ-945E 168.00 € Buy now
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MFJ 971 - portable tuner 1,8 - 30 MHz

MFJ-971

Similar to MFJ-945, but with additional 4:1 balun for symmetrial antennas, but without bypass switch. Very compact size 15 x 18 x 6.5cm. Max. 300 W PEP, instrument power range selectable 30/300W. Internally selectable to 6 W for QRP operations. Illuminated cross needle instrument.

Order No.
MFJ-971 159.00 € Buy now
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MFJ 986

MFJ-986

3KW tuner with aircore roller coaster coil. Cross needle instrument with PEP display. New type of differential var. capacitor, for very fast tuning. Six position antenna selector. With integrated balun 4:1.

Order No.
MFJ-986 449.00 € Buy now
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MFJ 914 - Auto-Tuner Extender

MFJ-914

Very useful product for rigs with built-in tuner. Most recent transceiver do have a built-in tuner, but those offer only a limited impedance range. This is where the MFJ-914 comes in. With the use of this tuner extender the impedance matching range is increased 10-fold, allowing to match nearly any antenna. No more problems due to component failures of the internal tuner. The "Off" Switch switches the antenna to ground and the transceiver to the external (optional) dummy load. Works on shortwave from 160 to 10m, max. 300W.

Order No.
MFJ-914 102.40 € Buy now
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MFJ 16010 longwire tuner

MFJ-16010

Matches nearly any wire, with max. 200 W PEP. Translates high-z to low-z or vice versa by reversing the unit. Small dimensions: 5 x 7.5 x 5cm, also very useful for receiving-only antennas.

Order No.
MFJ-16010 90.90 € Buy now
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MFJ 989 D

MFJ-989D

1.5kW SSB PEP tuner, improved with new aircore roller coaster coil. Built-in 300 W dummy load, six position antenna selector. Even 6kV HF voltage does not bother this monster tuner. Integrated 3KW balun for parallel wire feeds.

Order No.
MFJ-989D 505.00 € Buy now
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MFJ-969 Versa Tuner II

MFJ-969

300 Watt PEP, 8 way antenna switch integrated cross needle instrument, integrated dummy load, with balun 4:1 for parallel wire feeds. Instrument selectable for peak/average power measurement

Order No.
MFJ-969 293.00 € Buy now
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MFJ 931 - Artificial ground

MFJ-931

The solution for insufficient grounding in the shack.
Transforms the present system into a nearly perfect ground system. Even if no grounding at all is available you can just lay out a wire. Useful against BCI/TVI or with 'hot' chassis. Useful when your shack has a very long connection to a ground system.
The MFJ-931 is installed between your rig and a ground feed and tuned to maximum ground current on the operating frequency. Frequency range 1.8 to 30MHz, dimensions 18 x 18 x 8cm.

Order No.
MFJ-931 140.30 € Buy now
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MFJ-1048 Pre-Selector

Passive Preselector with high dynamic range! It improves the performance of nearly any HF or shortwave receiver/transceiver. It vastly improves the most expensive receivers. Especially helpful to those with broadband front-ends that are prone to overload. Protects your sensitive receiver input from damage (including switching diodes and attenuator resistors) caused by very strong signals from multi-transmitter, multi-band operation -- contests, field day, nearby hams, CBers, TV/FM/AM stations.
It eliminates phantom signals by suppressing strong out-of-band signals that cause intermod, blocking and cross modulation. Completely eliminates second order intermod problems caused by strong out-of-band shortwave broadcast signals mixing and producing unwanted in band signals.
Has narrow bandwidth, excellent stopband attenuation, low loss, constant bandwidth and gain over each band. Excellent attenuation in adjacent contest bands.
The entire 1.6 to 33 MHz HF band is covered in five overlapping bands. An RF sense transmit/receiver switch with adjustable time delay automatically bypasses your MFJ-1048 when you transmit. Also has PTT line T/R switching. Plugs between antenna and transceiver. Fully shielded metal enclosure. Tough black finish.

Order No.
MFJ-1048 Pre Selector 182.90 € Buy now
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