![]() * 1.3 to 30 MHz continuous frequency coverage ![]() * Direct readout of matching L-C values available after tuning * Highly efficient switched, network matching circuit * Tune in less than 20 seconds, usually less than 5 seconds * Automatically match antennas from 12 to 1,600 ohms impedance (SWR up to 32:1) Each of the two antenna selections has four banks of memory, which can learn and remember more than 2,500 frequencies and tuner settings per bank. The next time you operate on that frequency (or close to it) and antenna, these tuner settings are instantly restored and you're ready to operate in milliseconds. When you transmit, they automatically adjust for minimum SWR and remember the frequency and tuner settings, which are safely stored in non-volatile memory. All MFJ 998 IntelliTuners™ learn and remember. And once a match is found, the matching network values can be displayed, so you may design your own fixed matching network if desired. The nominal tuning ranges are 0 to 24 microhenry and 0 to 3,900 pF (input) or 0 to 970 pF (output). This provides a total of 81,664 L/C tuning combinations. A maximum of 256 values of inductance and 256 values of input capacitance, or 64 values of output capacitance, is available. They're rated at 1,500 watts SSB/CW and will match impedances from 12 to 1,600 ohm antennas (SWR up to 32:1). MFJ 998 legal limit tuners include a highly efficient switching L-network with wide matching capabilities, 1.8 to 30 MHz coverage, cross-needle power meters, a backlit LCD display, a radio interface port, and heavy-duty 16 amp/1,000 V relays. Each of the two antenna outputs has four banks of memory, and each memory bank has over 2,500 non-volatile memories for tuner settings. MFJ's exclusive InstantRecall™, IntelliTune™, and AdaptiveSearch™ algorithms give you fast, automatic tuning with more than 20,000 non-volatile VirtualAntenna™ memories. These exclusive MFJ antenna tuners fully protect your amplifier during tuning and will even take your amplifier off-line should the SWR increase above a user-defined preset limit. MFJ 998 tuners include MFJ's Amplifier Bypass Control™. Balanced feedlines may be used with an external 4:1 balun connected to the MFJ 998 antenna output. MFJ 998 tuners let you rapidly tune almost any unbalanced or single-wire antenna automatically. MFJ 998 legal limit IntelliTuner™ automatic antenna tuners are comprehensive, automatic antenna tuning centers with an SWR/wattmeter and an antenna switch for two antennas. Here is a circuit that will resonate a short whip antenna for the HF Bands.MFJ 998 Legal Limit IntelliTuner™ Automatic Antenna Tuners This homebrewed antenna tuning unit also incorporates a 50-ohm QRP dummy load, power meter (1 or 10 Watts full scale), and SWR meterĪ 10 to 80 meters band qrp antenna tuner by KC8AON, based on Steve Weber, KD1JV "ALT or Altoids L Tuner" This antenna tuner is a multi-type matching system in the same box, which includes L - Pi and T networks. This small tuner by KC8AON has only 2 controls and will tune almost anything from 10 to 80Ī small antenna tuner for the Yaesu FT-817Īntenna Tuner operation, correct way to tune an antenna. The Ultimate Transmatch was described in the "Beginner and Novice" section of the July 1970 QST (). This homebrew legal-limit antenna tuner is based on the famous "Ultimate Transmatch" introduced by the late Lew McCoy, W1ICP. Interesting project to remotely control, using a servo control circuit, a common commercial antenna tuner by N30X Get maximum power to your antenna by learning how to hook up and use a tunner to properly "trick" your rig KC8AON mini antenna tuner that tunes almost any antenna you connect to Includes circuit diagrams pictures and test results by GW4ALG ![]() A pdf document from a QST article made available for novices and beginners by ARRLĪ small HF antenna tuner project for qrp operations. ![]() The published version of this article appeared in the February 1990 issue of QST Magazine It all depends on the type of antenna and feed line you're using.
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