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Reviews Categories | Antenna Tuners/Matching Networks | MFJ-934 Antenna Tuner/Artificial Ground Help

Reviews Summary for MFJ-934 Antenna Tuner/Artificial Ground
MFJ-934 Antenna Tuner/Artificial Ground Reviews: 9 Average rating: 4.4/5 MSRP: $179.95
Description: 1.8 - 30 MHz 300 watt artificial ground / antenna tuner
Product is in production.
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KF4ULD Rating: 5/5 Jan 17, 2018 21:23 Send this review to a friend
VERY UNDERRATED!  Time owned: 0 to 3 months
I have an LDG 100 ProII and an MFJ 993B and this will tune my G5RV Mini to 6M almost perfectly and the LDG and MFJ won't come close to it. It's slow and manual but the feeling I get having such a very low SWR compared to the other two is worth it. Plus, it's perfect for the campsite where power is limited as this needs no power supply except for the meter illumination. 73 / KF4ULD
K3MOV Rating: 5/5 Dec 5, 2017 06:37 Send this review to a friend
KEPT MY HAMMING ALIVE!  Time owned: 0 to 3 months
In a nutshell, my wife and I downsized from a huge five bedroom home to a two bedroom apartment in a retirement community. Sold my ProIII, ALS 600, 43 ft. vertical, etc. because I was told community had a Ham club. It didn't. Wife and I went mobile for a while up and down parks around Chesapeake Bay. Eventually grew tired of this and wanted a 24 hour ham shack. Pondered possibilities for an antenna for about a year. There were lots of restrictions as you might imagine. Such as "No Antennas". Tried different antennas with slight success and they were too visible. Finally tried the MFJ 934. Eureka!! Ran a 63 ft. wire out window of shack to top of nearest tree about 30 ft. high. Used flex weave wire for two counter poises across carpet of apartment, 1/4 wavelength on 20 and other on 40. Easy to put down and take up. As they say in all the ads, I am working the world SSB in terrible conditions with 100 watts with IC 706MkIIg. Only one resident has commented on the antenna. That was two months ago and I haven't heard anything from the Gestopo. I have absolutely no idea why this antenna works so well(perhaps good elevation) but I haven't had this much fun since I was KN3MOV in 1960. MFJ 934 is recommended for all condo and apartment dwellers!!
WB3D Rating: 5/5 Sep 28, 2014 08:34 Send this review to a friend
Tuner and Ground Matching Work  Time owned: 0 to 3 months
I live in a condo and use a 30' 22 Gage wire antenna deployed out the window into a palm tree with a variable length counterpoise in the shack. The 934 tunes 10-40 meters appropriately (as does the MFJ 971 and 901). I have had issues with RFI in the shack especially the computer. I do a lot of digital modes. The Ground Matching section of the 934 does a good job in eliminating the RFI. However, it was necessary to adjust a cover screw that was shorting out the Ground Matching inductor prior to getting the inductance working. This is a new unit right out of the box manufactured this year. Now works great! Wish I had gotten it sooner. The 5 is for performance.
TA3EP Rating: 5/5 Jan 24, 2013 12:49 Send this review to a friend
Great tuner  Time owned: 0 to 3 months
Great tuner. Artificial ground is really functionel. It tunes my FT 857D smoothly at full 100W. output. Antenna is a 30 ft. longwire outside the window and 30 ft. counterpoise on the carpet. Works great on all HF bands and even on 6 m. No bad surprises, no electrical arks or any other botherings. I would recommend it.
WB3FXW Rating: 4/5 Jan 15, 2012 10:57 Send this review to a friend
It works, now  Time owned: more than 12 months
I have owned the MFJ-934 unit for 18 months. When received it did not function properly. I took the top cover off and again tried the tuner. It worked. That was a major clue about what was wrong. The two inductors were not level. They should be evenly spaced between the case bottom and case top, A straightedge across the top, front to back, confirmed that the inductors would short out against the case. I carefully bent the brackets that held the inductors to the case bottom until 3/8" space was above and under both inductors. Now the MFJ-934 works flawlessly. Had I not had a DOA unit on arrival, the rating would be a 5.
Buzz, WB3FXW
K7GLE Rating: 3/5 Oct 10, 2007 14:15 Send this review to a friend
Functional but not great  Time owned: 6 to 12 months
I have owned this unit (which looks different from the illustration on this page) for about a year. New Technician + HF license, old TS-530 driving a 25’ single wire antenna against a relatively close-by cold water pipe ground.

Out of the box it tuned the antenna acceptably across the HF bands I was licensed for but the ‘artificial ground’ function behaved strangely…the ‘reflected power’ needle (on the cross-needle power/SWR meter) would simply freeze and the ‘power’ needle (which is supposed to register your ground tuning adjustments) would not register at all, regardless of adjustments.

I returned it to MFJ, who promised me quick turnaround because it was such a new order. Ha. I didn’t get it back for nearly a month, even after repeated telephonic assurances it was ‘shipping out today or tomorrow.’

The ground adjustment did function after repair. I never experienced any RF in the shack (that I recognized, anyway…new ham, remember, and I was only using CW, not brushing my lip against a mic). I have upgraded my license and am using *somewhat* improved antennas (a simple vertical pipe with 2 radials trimmed to 40M, and a 10M vertical dipole whose top el is about 25’) now. I have no trouble tuning up to 1.5:1 or better on any HF band with the 934 – at what cost in signal loss I can’t say.

I get no response at all anymore from the artificial ground adjustment…nothing. Could be my excellent antenna systems?

As mentioned by others, I have noted some hand capacitance, but it’s only troublesome on 10M, where the tuning is particularly ‘twitchy.’

Overall construction seems lightweight for a supposed 300W tuner. This last weekend I noticed some internal arcing for the first time at 100W on 40M but haven’t looked into it any further.

Glenn K7GLE
KE5AKG Rating: 5/5 Apr 4, 2004 17:28 Send this review to a friend
my favorite piece of gear  Time owned: 0 to 3 months
I bought this tuner after I could not tune my attic dipole on several bands with the autotuner built into my transceiver. It tunes the dipole well, but I had even better results with a 70 ft
random wire and several counterpoise wires running around the room and out of the window.
With this setup I was able to contact 12 DX countries on 3 continents within 2 days (there was a contest on) using only 100 watts. After this positive experience, I installed a 50 ft
random wire antenna on the top of my rv in a v-shape. It is attached to the ladder and roof rack with dog bone insulators and nylon rope,
and to a 15 in long PVC pipe standoff in front
With this setup I so far made contacts as far away as Maine and Aruba on 40m and 20m. I did not get the RV setup to tune on 10m, 12m or 160m, but I hardly ever use those bands anyway.
Overall this is an outstanding piece of equipment for wire antenna fans like me. It is a great value for the money. My only gripe (minor) is that it has "hand capacitance", meaning the SWR changes when I touch the tuning knob, which can make it a little tricky to tune on some bands. Also, I wished they would make a higher end version of it with higher power handling, so that I could use an amplifier for my base station.
N0EYE Rating: 4/5 Mar 20, 2003 12:21 Send this review to a friend
Peforms well  Time owned: 0 to 3 months
I bought this unit because my shack is on the 2nd floor of our house...too far away from earth ground. The tuner performs well. I am able to tune my 130' dipole on all bands, 10-160M at 100W with no arcing or other problems. I believe the shafts of the tuning capacitors need to be better isolated, as my touch will affect the SWR readings.

The "artificial ground" seems to be functional, as I have no RF problems in the shack.

As the previous review said, the documentation could be a little better. I find it a bit confusing in places, but I've seen worse manuals too.

I would recommend this unit.
KB4COM Rating: 4/5 Apr 5, 2002 09:04 Send this review to a friend
Nice Unit  Time owned: 0 to 3 months
I live in an apartment, on the second floor. Due to being a renter, I can not run a proper RF ground. This being the case, I had significant problems getting reasonable SWR's on my antennas (I am using mobile whip types, in a mag mount, on the balcony). The MFJ-934 has shown it self to be capable of reducing the SWR's, to a great extent. Unfortunately, there are other problems here, that I can not control (like aluminum siding).

I have been able to use the "artificial ground" feature, but I would like to see improvements in the manual, it is somewhat short, and the illustrations are a bit confusing. Overall, I like the unit and feel that my money was well spent

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