R&L Electronics

Text Questions to
513-868-6399

800-221-7735

Catalog » Radio Accessories » MISC » MFJ931	My Account \| Cart Contents \| Checkout

Amplifiers
Preamps
440 MHZ 144 MHZ 50 MHZ HF VHF/UHF MISC
Antennas

440 MHZ MOBILE 220 MHZ MOBILE 144 MHZ MOBILE 50 MHZ MOBILE 28 MHZ MOBILE 24 MHZ MOBILE 21 MHZ MOBILE 18 MHZ MOBILE 14 MHZ MOBILE 10 MHZ MOBILE 7 MHZ MOBILE 3.5 MHZ MOBILE MULTI BAND VHF/UHF MOBILE MULTI BAND HF MOBILE MULTI BAND HF/VHF/UHF MOBILE MULTI BAND HF/VHF MOBILE 440 MHZ BASE 220 MHZ BASE 144 MHZ BASE 50 MHZ BASE 28 MHZ BASE MULTI BAND VHF/UHF BASE MULTI BAND HF BASE MULTI BAND VHF/UHF/HF BASE MULTI BAND VHF/HF BASE MULTI BAND VHF/HF MOBILE MULTI BAND VHF/HF PORTABLE 220 MHZ PORTABLE 144 MHZ PORTABLE MULTI BAND VHF/UHF PORTABLE MULTI BAND HF PORTABLE MULTI BAND HF/VHF PORTABLE MULTI BAND VHF/UHF/HF PORTABLE CB ANTENNAS ANTENNA ADD ONS RECEIVE ONLY ANTENNAS DUMMY LOAD BALUN/CENTER INS RADIAL KITS MISC
Antenna
Accessory
DUPLEXER TRIPLEXER ROTATORS MISC
Antenna
Mounts
MAGNET TRUNK LIP THRU HOLE GUTTER BUMPER THRU GLASS CLIP OVER WINDOW LUGGAGE RACK MIRROR MISC
Antenna
Tuners
UHF MANUAL VHF MANUAL HF MANUAL HF AUTOMATIC MISC
Books

STUDY TYPE Nifty Manuals MISC
Cable
Coax
RG58 MINI 8 MINI 8 W/CONNECTORS RG8 RG8 W/CONNECTORS RG59 RG59 W/CONNECTORS LADDERLINE/TWIN LEAD ROTATOR CABLE GROUND WIRE RG213 RG213 W/CONNECTORS RG316 W/CONNECTORS RG316 HT JUMPERS MISC
Connectors

CONNECTOR END POWER POLE ADAPTER MISC
Power
Supplies
LINEAR <15 AMPS (TRANSFORMER TYPE) LINEAR 15-40 AMPS (TRANSFORMER TYPE) LINEAR >40 AMPS (TRANSFORMER TYPE) SWITCHING <15 AMPS SWITCHING 15-40 AMPS SWITCHING >40 AMPS WALL CUBE INVERTER MISC
Radios

440 MHZ HT 220 MHZ HT 144 MHZ HT 440 MHZ MOBILE 220 MHZ MOBILE 144 MHZ MOBILE 144/440 DUAL BAND MOBILE 28/50/144/440 QUADBAND MOBILE HF/50/144/440 MOBILE HF/VHF MOBILE HF MOBILE 144/220 DUAL BAND HT 144/440 DUAL BAND HT 144/220/440 TRI BAND HT 50/144/440 TRI BAND HT 144 MHZ BASE 50 MHZ BASE 28 MHZ BASE HF BASE HF/VHF BASE HF/VHF/UHF BASE VHF/UHF BASE SCANNER RECEIVER SHORTWAVE BASE WEATHER RADIO RECEIVER SHORTWAVE HANDHELD/PORTABLE REPEATERS AM MOBILE CB SSB MOBILE CB AM BASE CB SSB BASE CB HANDHELD CB KIT MISC
Radio
Accessory
Bandpass Filter Battery Cables Cases Charger Clock (Atomic) Clock (GMT Atomic) Clock (Statndard) Coax Switch DC Power Strip DTMF Unit External Speaker Filter Headsets Key/Keyers Kits Lightning Arrestors Low Pass Filters Mics and Speaker Mics Misc Mounts for Radios Software SWR Analyzers TCXO TNC/Sound Card Interfaces Tone Unit Voice Synthesizer Wattmeters
Tower

20G AND ACCESSORIES 25G AND ACCESSORIES 45G AND ACCESSORIES BX TOWER AND ACCESSORIES 55G AND ACCESSORIES MAST PIPE AMERICAN TOWER AMERITE 20/25 & ACCESSORIES AMERICAN TOWER AMERITE 45 & ACCESSOREIS AMERICAN TOWER AMERITE 55 & ACCESSOREIS AMERICAN TOWER GCS COMMUNICATIONS TOWER AMERICAN TOWER SPECIAL COMMUNICATIONS TOWER MISC

Brand

Email
Subscribe to our email list
Unsubscribe to our email list

Catalog

Request Catalog
Download eCatalog

Store Info

FAQ
Map to Store
Special Events
Store Hours

MFJ-931 MFJ MFJ931
[MFJ931]

Name: MFJ MFJ931 1.8-30MHz HF ARTIFICIAL GROUND
Brand: MFJ
Price: 131.95 USD
Availability: OutofStock

$131.95

Click to enlarge

1.8-30MHz HF ARTIFICIAL GROUND

This is a special order item. We do not normally stock it. We will order it for you.

View the manual for MFJ931View the manufactures page for MFJ931View the eham review page for MFJ931
Create an artificial ground with the MFJ-931! It effectively places your rig
near actual earth ground potential even if your rig is on the second floor or higher with no earth ground possible! It electrically places far away RF ground at your rig.

How's your RF ground? Do you have RF "hot spots" that "bite" you when you transmit? Do you have RF feedback that causes your rig to quit working on some bands? Do you have TVI/RFI that makes your neighbors hard to live with? Do you get weak
signal reports because of extreme ground losses or radiation pattern distortion?

These problems could be caused by poor RF grounding, especially if your rig is on a second floor with no ground at all. Even if you have a good ground, a long connection wire can ruin it's effectiveness by isolating a true RF ground from
your rig.

MFJ-931 creates an artificial RF ground! It resonates a random length of wire thrown along the floor and produces a tuned counterpoise. This ground effectively places your rig near actual earth ground potential even if your rig is on the
second floor or higher with no earth ground possible.

Also, the MFJ-931 electrically places a far away RF ground directly at your rig -- no matter how far away it is. It reduces the electrical length of the ground connection wire to virtually zero by tuning out its reactance.

The MFJ-931 connects between your rig and a random length of wire or a connecting ground wire. It's tuned for maximum ground current using the built-in RF ammeter.

The MFJ-931 Artificial RF Ground covers 1.8 - 30 MHz and measures a compact 7.5W x 3.5H x 7D inches.

1.8-30MHz HF ARTIFICIAL GROUND MFJ-931 MISC RADIO ACCESSORIES

Shopping Cart

1 x	AMERITRON ATR30
1 x	AMERITRON ATP102
1 x	AMERITRON ALS606S
1 x	AMERITRON CF5X
1 x	AMERITRON AWM30BX
1 x	AMERITRON ARF500K2
1 x	AMERITRON AWM35BH
1 x	AMERITRON AWM30B
1 x	AMERITRON ATR20
1 x	AMERITRON AWM35B
1 x	AMERITRON ARF500K
1 x	AMERITRON ATP100
1 x	AMERITRON ARB704I2
1 x	AMERITRON ARB704
1 x	AMERITRON ARI500
19 x	MFJ MFJ1703B
1 x	AMERITRON PNP8DI
1 x	AMERITRON PNPDB15Y
24 x	LIDO LM1205
1 x	ALINCO ADUA83
10 x	ALINCO EDS12
1 x	ALINCO EDS10
1 x	AMERITRON PNP8MK
1 x	AMERITRON PNP8D
1 x	AMERITRON PNP7DI
1 x	AMERITRON QSK5
1 x	AMERITRON PNP8M
1 x	AMERITRON PNP35
1 x	AMERITRON PNP5D
1 x	ALINCO EDS14
1 x	ALINCO EDH33
1 x	ALINCO EDS11
1 x	AMERITRON PNP7D
1 x	AMERITRON MOD10MK
1 x	AMERITRON MIA6
1 x	POWERWERX PANELVOLT
1 x	ALINCO ADLM135
1 x	AMERITRON MOD10MB
1 x	ALINCO EDS29
1 x	AMERITRON MIA4
1 x	AMERITRON PNP5M
1 x	AMERITRON MOD10M
1 x	AMERITRON PNP8DT
1 x	ALINCO EDS17
1 x	ALINCO EDS30
1 x	AMERITRON PNP10MY
1 x	AMERITRON PNP13D
1 x	AMERITRON PNP7DK
20 x	MFJ MFJ1708BSDRS
1 x	BAOFENG UV5RBELTCLIP
2 x	LIDO LM505QR
1 x	HEIL PSEPARTS
2 x	LIDO LMAXBRACE
2 x	LIDO LM500DBQR
2 x	LIDO LMA1
2 x	LIDO LM803H
2 x	LIDO LMAD3
1 x	BHI A1042BK
1 x	MFJ MFJ806N
1 x	LIDO LM803QR
2 x	LIDO LM802QR
2 x	LIDO LM505EXP2
1 x	LIDO LMA2
2 x	LIDO LMEXP01
2 x	LIDO LMA5
2 x	LIDO LMAD4
1 x	LIDO LMAXBASE
1 x	LIDO LMA6
1 x	MFJ MFJ95A
2 x	LIDO LMAX
1 x	ALINCO EBC51
2 x	LIDO LM300QR
1 x	ALINCO EME70A