Mfj 931 artificial ground manual

Artificial ground manual

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How does the "MFJ 931" artificial RF mfj 931 artificial ground manual ground work? Bei Ebay kaufen I&39;ve not tried and MFJ one but I have played with a homebrew lash up. From the MFJ Catalog and: MFJ Enterprises Inc. A couple of the wires from the selector to the coil were touching each other also. It electrically places a far away RF ground at your radio. The MFJ-931 Artificial RF Ground measures a compact 7. 5H x 7D inches and comes in a sturdy metallic grey case with an attractive black facing. Also, the MFJ-931 will electrically place a far away RF ground directly at our rig.

You get all the best features of the MFJ-941E Cross-Needle Antenna Tuner and the MFJ-931 Artificial Ground in a single compact 10 5/8W x 3 1/2 H x 8 D inch cabinet -- and the MFJ-934 cost less. You get all the best features of the MFJ-941E Cross-Needle Antenna Tuner and the MFJ-931 Artificial Ground in a single compact 10 5/8W x 3 1/2 H x 8. Connect your existing ground wire to the red binding post labelled “To Counterpoise Wire or Ground Connection Wire” on the back of. If necessary, place the MFJ-931 and your transmitter or antenna tuner side by side or one on top of the other to insure the ground of each are as close to each other as possible.

El mfj-931 se conecta entre su Rig y aleatorio en una longitud de alambre o a la conexión de tierra wire. In conclusion, I’d recommend trying the MFJ-931 to anyone who can’t get a good ground due to station location. 그라운드튜너를 튜닝하는 방법. The MFJ-931 connects between your rig and a random length of wire or a connecting ground wire. Condition is "Used". It electrically places faraway RF ground at your rig. The MFJ-931 Artificial RF Ground covers 1. The question now is how do I test it?

Attach the length of random wire to the red binding post labelled “To Counterpoise Wire or Ground Connection Wire” on back of the MFJ-931. The term "artificial earth" is, in my view a misnomer. 95 Asking plus actual mfj 931 artificial ground manual shipping (CONUS only). MFJ 931 Artificial Ground in good working condition with box and manual, as shown. Of course with an indoor antenna such as this one you have a lot of RF floating around so the MFJ. There are 3 selectors on the front. This produces a tuned counterpoise. 95 SOLD Artificial Ground The MFJ-931 artificial 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.

Su ajustados para máxima corriente de piso utilizando el amperímetro de RF integrado. its great for traveling, emergency or as a makeshift antenna. The MFJ-931 mfj 931 artificial ground manual artificial ground A ground tuner (artificial ground) is similar to an antenna tuner. 8 – 30 MHz and connects between your rig and a random length of wire or a connecting ground wire. Connect your transmitter or antenna tuner to the binding post labelled “To Transmitter or Antenna Tuner Chassis Ground” on the back of the MFJ-931 with the shortest possible wire(s). Find helpful customer reviews and review ratings for MFJ Enterprises Original MFJ-931 1. MFJ-931 Instruction Manual Artificial RF Ground Installing a ground in the wrong fashion, such as mistuning and bad connections, can also generate additional RFI. 8 - 30MHz * Creates artificial ground * Reduces TVI/RFI * Easily connected to rig * Size 190 x 89 x 178mm The MFJ-931 creates an artificial ground, it resonates a random length of wire thrown along the floor and produces a tuned counterpoise.

8 through 30 MHz and measures in at 7 1/2" wide by 3 1/2" high by 7" deep. 8 - 30 MHz and measures a compact 7. MFJ MODEL 931 ARTIFICIAL GROUND. Most designs consist of a variable inductance and capacitance in series. MFJ-931 creates an artificial RF ground!

it&39;s great for traveling, emergency or as a makeshift antenna. Review Summary For : MFJ-931 Artificial RF Ground; Reviews: 25 MSRP: 89. 8 1/2 x 11" REPRINT OWNER&39;S MANUAL for the UNIDEN SDS200. Type: Artificial ground: Power supply:-Current drain/power consumption:-Dimensions (W*H*D):. The MFJ-931 creates an artificial RF ground! You get a 300 watt full featured, general purpose antenna tuner that covers 1.

To my knowledge, there isn’t another commercial product that does what the MFJ-931 Artificial RF Ground does. They&39;re tuned for maximum ground current using the built-in RF ammeter. For this, I’m very thankful as I’m now able to enjoy the full voice articulation of this wonderful Heil mic. Connect your transmitter of antenna tuner to the binding post labelled “To Transmitter or Antenna Tuner Chassis Ground” on the back of the MFJ-931.

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, using an indoor bazooka antenna for testing See com/bazooka-antenna/ I could see the SWR change as I tuned the artificial ground. 8 - 30 MHz HF Artificial Ground. I also found that one of the selectors e. I&39;m wondering if the MFJ-931 would really improve my RF Ground.

Basically, the "artificial earth" box inserts an impedance between the "earth wire" and the rest of the antenna system that makes the combined impedance look like a 1/4. MFJ-989D - Manual Tuner With Dummy Load. Harmonics and loss of signal strength can be the result. West, Toronto Ontario M3N1V7 · MFJ 931 Artificial Ground for auction. Even if you have a good ground, a long connection wire can ruin its effectiveness by isolating a true RF ground from your rig. If you do buy one of these products though, used or new, then my advice is to take the lid off and check for bad joints before you start to use it.

The MFJ-931 Artificial RF Ground is very easy to use and eliminated the RF problems I was having with the Heil Heritage microphone. A meter to measure actual current flowing through your ground connection is often included. The MFJ-931 creates an artificial ground with a random length of wire thrown on the floor. You get all the best features of the MFJ-941E Cross-Needle Antenna Tuner and the MFJ-931 Artificial Ground in a single compa.

My shack is on the second floor and about 35 feet from my 10-foot ground rods. I picked up one of those MFJ 931 Artificial Ground "tuners". It turns a random wire into an effective antenna that works. MFJ 931 artificial RF grounds cover 1.

It also reduces the electrical length of the ground connection wire to virtually zero by tuning out its reactance. Except for one small scratch on the face plate, it is in excellent condition and comes from a non-smoking/non-pet environment. How to wire MFJ 931? Specification The MFJ-931 creates an artificial ground, it resonates a random length of wire thrown along the floor and produces a tuned counterpoise. MFJ 931 artificial grounds connect between your rig and a random length of wire or a connecting ground wire. Does anyone have experience with the subject MFJ-931 Artificial RF Ground?

I was excited to have one of these as I have often thought it to be a cool device. El mfj-931 RF artificial Ground Covers 1,8 – 30 MHz y medidas un 7,5 W x 3. It’s tuned for maximum ground current using the built-in RF meter and works by electrically placing a far away RF ground directly at your rig – no matter how far away it is. Be sure not to reverse these wires. The MFJ-934 combines a versatile antenna tuner with an artificial ground. See full list on delta-alfa. What is artificial RF ground?

Read honest and unbiased product reviews from our users. 1 bad joint or touching wire will render this product useless and it really does have so much to offer any radio comms enthusiast. Second Hand MFJ-931 Artificial Ground * Frequency coverage 1. A special circuit in this tuner cancels the reactance of a ground lead or counterpoise, and reduces problems caused by RF "in the shack".

Energy outside the band may become great enough to radiate into the commercial radio and TV bands. One hitch I experienced with the MFJ-931 Artificial RF Ground straight off was with the cold solder joints falling off the connections on the board and producing sporadic problems. Free delivery for many products! Shipped with FedEx Ground or FedEx Home Delivery.

8-30 MHz HF Artificial RF Ground. Where is MFJ 931 located? It resonates a random length of wire thrown along the floor and produces a tuned counterpoise. Connect your existing ground wire to the red binding post labelled “To Counterpoise Wire or Ground Connection Wire” on the back of the MFJ-931.

Find many great new & used options and get the best deals for MFJ-931 Artificial Ground at the best online prices at eBay! This artificial ground effectively places your rig near actual ground potential; even if your rig is on the second floor or higher where no earth ground is possible. It&39;s then tuned for maximum ground current using the built-in RF ammeter. Tuned counterpoise is a better way to think of it. the units side by side or one on top of the other.

Note: This wire needs to be as short as possible, preferably with the ground posts as close as possible i. · MFJ-931 Artificial Ground Looks mfj 931 artificial ground manual in very good condition with light handling marks, We have no reason to believe this is not working but have no way to test this item so we&39;re selling it as "parts". There is also a signal meter for RF Ground current readings on the front (See right). For starters, the reason I am asking is that I have not been able to get the meter to show any movement. 01/20 Click here for technical info on this model No item UJ13 MFJ-931 .

8-30 MHz and measure a compact 7. · MFJ 931 artificial grounds connect between your rig and a random length of wire or a connecting ground wire. The MFJ-934 is a 300 watt (175 watts on 160 meters) RF output power antenna tuner and artificial ground system that will match any transmitter or transceiver to virtually any antenna. 5h x 7d pulgadas compacto. 4335 Steeles Ave. 95; Description: Resonates a random length wire counterpoise and produces a tuned artificial RF ground or places a far away RF ground at the station equipment by tuning out ground lead reactance. The MFJ-931 will effectively place your radio near an actual earth ground potential even if your radio is on the second floor or higher or located in the center of your home with no earth ground physically possible!

Includes BNC to SO-239 adapters, Owner&39;s Manual and box. See more results. · Find many great new & used options and get the best deals for MFJ-931 Artificial Ground at the best online prices at eBay! From what I’ve read, this has been an issue with some of the older units but after re-soldering all joints and manipulating the wires, which only took about 30 minutes, everything worked great! Its tuned for maximum ground current using the built-in RF ammeter.

Mfj 931 artificial ground manual

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