![]() All parts are made in the US by Blue Ridge Amateur Radio of North Carolina. This includes the roller inductors, capacitors, reduction drives, turns counters, shaft RF isolators, RF switch and case. It gives you superb current balance throughout its very wide matching and frequency range. Antenna Tuner, Automatic, Desktop, 160-6 meters, 0.1 to 125 Watt SSB/CW, 30W Digital, Package Includes 7 Interface Cables for all Radios, Each. ![]() ![]() The ST-1500 is built with all custom made components. The MFJ-974HB is a fully balanced true balanced line antenna tuner. This is a significantly excellent value for return loss and is directly attributable to the quality of materials used and precision machine work. antenna ensures perfect reception and easily handles those little bumps in the. Analysis with a RigExpert AA-55 has shown that the ST-1500 is capable of achieving a return loss of 50db, when tuned to an SWR of 1.0:1. balanced mic level (600 ohms) to unbalanced (-10 dBm) output. This includes tuning on both the high and low sides of each band. Key to analysis of the topology is that the centre of the output inductor is grounded. In the article he describes and shows: current meters which presumably attach to J2 and J3. 40m (120 ft) RF Outdoor Unit Power Amplifier Steuerung Endstufe Key Line max. Tuner System Block Diagram Transceiver SWR Meter Control Cable Coax 50 Ohm AT-615B Automatic Controller HF-Sensor RF Probe AT-615B Tuner Antenna max. The ST-1500 is capable of full QRO operation and is capable of tuning to an SWR of 1.0:1 on all bands from 160 meters through to 10 meters. WZ5Q extended the design and provides a writeup on optimising balance. range as well as the span, and the tuner settings. These caps can be easily replaced with other doorknob style capacitors if different values are required for a specific antenna system situations. The tuner also has a set of fixed value capacitors (400pf) that can be switched in individually, if required, to account for highly inductive antenna systems. The inductors have a maximum value of 20uh and the capacitors have a maximum value of 300pf. It gives you superb current balance throughout its very wide matching and frequency range.Johnson MatchboxFor decades, the Johnson Matchbox has been the standard of comparison for balanced line tuners. This tuner is comprised of 2 roller inductors and 2 air variable capacitors. The MFJ-974B is a fully balanced true balanced line antenna tuner. The ST-1500 tuner is a fully symmetric PI-Network tuner for use with balanced line antenna systems. ST-1500 Symmetrical Antenna Tuner-$800.00 Palstar BT1500A 1500 Watt Double L Balanced Antenna Tuners BT1500A Antenna Tuner, BT1500A, Double L Balanced, Manual, Desktop, 1,500 W, 1. de 2016 Ive built an antenna and tuner for an AM radio before by putting. You can tune any balanced lines including 600 Ohm open wire line, 450/300 Ohm. line feeding a balanced antenna or radiation of the antenna onto the feed line. The AT-1500 is a tuner that will last a lifetime.Note: Please call Gary at 50 before you order to determine availability! MFJ Enterprises Original MFJ-976 1.830 MHz Balanced Antenna Tuner, 1500 Watts. A small-sized roller inductor operates all the way up to 6 m, while a relay-switched add-on inductor allows 160 m operation.Īlso included is Pastar's Active Peak and Peak Hold dual cross-needle metering as in the popular PM2000A wattmeter and 11ga.090" thick chem-film treated aluminum metalwork and durable powder coated finish. Replace the coax with a run of balanced line, use a good, balanced line antenna tuner. The AT-500 utilizes only 2 controls to operate for tuning, providing maximum ease of use in a manual tuner. The Palstar quality and features that Hams worldwide have come to expect is now available in a compact, low power affordably priced tuner, the AT-500 600 watt antenna tuner.Ĭovering 160 to 6 Meters with a power rating of up to 600 watts PEP, the AT-500 features a differential tuning capacitor with 2 stators and 1 rotor, a precision ceramic body roller inductor, and a 4:1 ferrite current balun for balanced line feeds.
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