989b tuner images11/23/2023 ![]() If you are looking for a tool that will be able to do everything you need to do with images every day, missing Image Tuner would be a crime! Most users don't need Photoshop functionality to fulfill fairly simple daily image processing tasks. These are commonly reported problems on eham reviews.Image Tuner is a batch photo resizing, renaming, conversion and watermarking tool with an intuitive UI. The inductance switch could flash over with extreme loads and the capacitor air spacing could also give problems with high impedance of highly reactive loads from random wire end fed antennas. More importantly, it eliminated a shorted turn which reduced Q of the coil and increased losses in the transmatch. This increased the available inductance for 160 Meter operation. See the photo (red circle) to view the plastic tie wrap anchor I employed as a replacement for the ground lug farthest from the end of the coil. The other serious MFJ-900 deficiency, which can be corrected, is the use of two ground lugs to mount the main coil. The smaller Ten Tec transmatch I review on this page is similar in ratings and features, but it has a clever variable toroid for the inductance to solve the coil problem this makes it more efficient, but it generally costs more used than this MFJ-900. While this size allows easy portability, it has its down side. The coil is spaced less than ΒΌ inch from the aluminum top and bottom panels. One problem with the design is the compactness of the cabinet. I only tried it on coax fed dipoles, to extend their operation to band edges, at 6:1 maximum. Other bands worked OK, as long as you did not exceed 100 Watts output. ![]() While it claims 160 Meter coverage, it did not handle the match needed for my full wave loop. This unit can be used for coupling a solid state exciter to an older grounded grid amplifier which does not have tuned inputs for low SWR to the exciter, such as the Heathkit Warrior or some versions of the Gonset Linears. These can be had used for inexpensive prices, but take off the top cover and inspect them for damage before buying at a swapmeet. See the photos for the SWR bridge and MFJ-900 that I use for portable operation. It is easy to use, and even in this basic form includes end fed wire and coax feed connections. This transmatch is very compact, making it ideal for portable or field day operation. It is unfair to compare it to transmatches outside its price class. Let me make this clear at the outset: this is an ECONOMY tuner at a bargain price. The bigger new Palstar has been reviewed well in QST. But none that I have seen approaches the quality and performance of the Dentron MT-2000A reviewed on this website, except for the most expensive offerings. The larger 300 Watt units are generally better quality, and the biggest ones are much better. Even the newer offerings are the same simple T match circuit, with similar ratings. The design does not change from model to model except for additions of antenna switches, baluns, and SWR meters. This review covers all the basic 100 Watt MFJ tuners.
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