1.5 kW Automatic Remote Controlled Antenna Balanced Tuner Model AT- 615U Premium Quality, 1500 Watt Rated, Automatic Antenna Tuner by Hamware.
Built-in lightning arrestors
Matching of any type of unbalanced antennas 1.8 to 30 MHz
High Q Pi-Network especially designed for low band verticals
Ham bands are divided into 85 programmable memory locations for tuner settings
Automatic selection of these tuner settings based upon the transmitted frequency
The indication of memory allocations and tuner settings are on LCD
"Thru" function, all network elements are set to zero
PA keyline interruption while tuner matching is active
Weather protected (IP66) UV resistant Polycarbonate cabinet for the RF unit
N-type connector input. Balanced Open Wire Line Terminal screws at the output. Manually tune band segments and memorize settings. In operation, the tuner will recall the settings for a given band segment when it detects the RF.
The Control Cabinet contains the tuning controls, memory location selection, Automatic or Manual switching and a display that indicates the memory location in use, the frequency range as well as the span, and the tuner settings.
Antenna Tuner System AT-615U Description
Basically, all unbalanced Antennas can be matched remotely. Special focus in the design of the tuner was set to operate Low Band Verticals. Due to the p-network, low antenna impedances can be achieved.
The remote-controlled matching system AT-615U is capable of matching unsymmetrical antennas from a minimum length of 30 ft. within a frequency range of 1.8 to 30 MHz. The antenna length is dictated by the space available rather than the usual resonant length. It easily covers all amateur bands (including WARC) using a single wire dipole without traps. Traps have long been known to induce losses and antenna’s designed using them are frequently limited in overall bandwidth.
The Ham bands are divided into 85 operator programmable memory locations. It will handle 1500 watts of SSB or CW power, and it can be used in either automatic or manual mode.
Tuner System Block Diagram
Antenna matches are stored into a bank of 85 memory locations. Each memory location is a fraction of an amateur band. Refer to the technical section for the fractional segments for each band. As shown in the picture below, the upper line of the LCD shows the actual memory location chosen (lower edge frequency 1840 kHz) with its span (20 kHz). The control settings for this frequency are shown in the lower line of the LCD. In the Automatic Mode the memory location and its stored settings is selected by the transmitted input frequency. The input frequency is obtained from an RF probe. The memory location contents can be erased by a push button on the back of the controller.
The controller contains 3 rotary encoders that control the tuner elements TRX, L, and ANT. TRX controls the Input Capacitance, L controls the Inductance and ANT the output capacitance values. The lower line on the display shows these values.
A manual selector switch is provided for memory selection in the Manual mode.
Controller Connections (Rear Side)
RF Probe Installation
If possible, the RF Probe should be attached directly to the antenna jack of the transceiver using an adaptor or a very short cable
The RF Unit is contained in a weather-protected cabinet (IP66) and is UV resistant. There are two feed-thru insulators to connect to the antenna elements. The coaxial cable and the control cable are connected via an N and 254 pin connectors. There is no active circuitry inside the RF Unit. This is to ensure reliable operation even under non-matched condition.
The LC network is known as Balanced PI. At the front end of the network, there is a balun transformer that matches the unsymmetrical coax cable to the symmetrical tuner elements. This is the only place where the impedance of the system is purely resistive (when matched) and is the ideal place for the Balun. The regular station SWR meter (or the builtin meter in the TRX) is used as an indicator to match the antenna.
The capacitors at the front end are switched in 256 steps of 17 pF per step. The capacitor at the antenna side is a variable capacitor of 400 pF. The control of this capacitor is by a stepper motor with 0.9° per step. The inductive paths between the capacitors are switched in 31 steps from 0.2 µH to 35 µH. Switching is done by power relays. With the circuit components used it is possible to match short antennas up to an unlimited antenna length within the RF range from 1.8 to 30 MHz.
Interior view of the RF unit looking at the capacitor board, the inductor board is located below
Installation of the RF Unit
The weatherproof cabinet has 6 mounting holes.
The backside of the cabinet should be mounted on a flat surface.
Hole spacing is 13.62”H x 9.41”W (346mm x 239mm)
Connect the ground bolt between the two antenna insulators with the lightning rod.
If the RF Unit is installed outside, a small roof or overhang is recommended to protect the unit from direct sun. If the tuner is not protected, the excessive temperatures inside the cabinet could damage the antenna tuner elements.
Antenna Selection Unit ASU-502 (optional)
Possible Tuner Applications
Application with Antenna Selection Unit ASU-502 for 2 Antennas
Bundle with our Antennas to receive further discounts and the ease of one-stop shopping for your all-band access.