- DL manuals
- LDG
- Tuner
- AT-100Pro
- Operation Manual
LDG AT-100Pro Operation Manual
Summary of AT-100Pro
Page 1
At-100pro operations manual manual rev b page 1 ldg at-100pro 100w automatic antenna tuner ldg electronics 1445 parran road st. Leonard md 20685-2903 usa phone: 410-586-2177 fax: 410-586-8475 ldg@ldgelectronics.Com www.Ldgelectronics.Com.
Page 2: Table of Contents
Page 2 table of contents introduction 3 jumpstart, or “real hams don ! T read manuals!” 3 specifications 4 an important word about power levels 4 important safety warning 4 getting to know your at-100pro 5 front panel: 5 back panel: 6 installation 7 basic operation 9 using the front panel buttons 9 ...
Page 3
Page 3 introduction ldg pioneered the automatic, wide-range switched-l tuner in 1995. From its laboratories in st. Leonard, maryland, ldg continues to define the state of the art in this field with innovative automatic tuners and related products for every amateur need. Congratulations on selecting ...
Page 4
Page 4 specifications • 1.0 to 125 watt power range (ssb and cw), 100w on 6m. • latching relays for ultra low power operation. • over 4,000 memories for instantaneous band changing. • built-in 2-port antenna switch, with 2,000 memories each. • tuning time 0.2 to 2.5 seconds full tune, 0.2 seconds me...
Page 5
Page 5 getting to know your at-100pro your at-100pro is a quality, precision instrument that will give you many years of outstanding service; take a few minutes to get to know it. Front panel: the front panel of the at-100pro features seven push buttons and two led bargraph scales: • func: activates...
Page 6
Page 6 there is no power button on the at-100pro. When the tuner is idle, it enters a low-power sleep mode, drawing very little current. When the tuner detects a button press or an rf transmission, it “wakes up,” ready to act. Back panel: the rear panel of the at-100pro has six jacks. • ant 1: conne...
Page 7
Page 7 installation the at-100pro is intended for indoor use only; it is not water-resistant. If you use it outdoors, (club picnic outdoor barbecue, for example) you must protect it from rain. The at-100pro is designed for use with coax-fed antennas. If use with longwires or ladder-line-fed antennas...
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Page 9
Page 9 basic operation using the front panel buttons all operations of the at-100pro are controlled via the front panel buttons. Although there are a total of seven buttons on the front panel, there are more than seven functions that can be carried out on the at- 100pro. In order to accommodate the ...
Page 10
Page 10 user configuration options the at-100pro offers several user-settable options that allow the behavior of the tuner to adapt to many different operating circumstances. Most of these options are accessed by placing the tuner in function mode, which is done by pressing and releasing the func bu...
Page 11
Page 11 to toggle between power display modes, press func -> c up (peak) (press and release func , then press and release c up (peak) ). Peak mode is indicated by a falling meter display, with the highest power shown as a steady led while the remaining leds fall back to zero. Average mode shows the ...
Page 12
Page 12 the default value of swr threshold is 2.0:1. The following example shows setting the swr threshold to 1.7:1. Antenna selection: press the ant button momentarily to toggle which antenna port is currently active. The led display “points” toward the active antenna port to indicate the selected ...
Page 13
Page 13 tuning basic tuning operation a tuning cycle on the at-100pro is initiated from either the tune button on the front of the at- 100pro, an over-swr condition when in fully automatic tuning mode, or from pressing the tuner/call button on the front of an icom radio connected using the icom inte...
Page 14
Page 14 if you are not using the icom or yaesu radio interface cable, you will need to key the radio manually. In ssb or am modes, begin talking into the microphone. Hold down the code key on cw. Note that if your radio does not incorporate an swr rollback circuit 2 , you will first need to reduce p...
Page 15
Page 15 error indication when performing a tuning cycle, there are several conditions that may occur that cause the tune to fail. All are reported as an error, which is indicated by the entire row of pwr leds flashing briefly. • no rf power was present at the beginning of a tuning cycle. In other wo...
Page 16
Page 16 high/low relay adjustment in addition to being able to manually control the inductor and capacitor value of the at-100pro, it is also possible to manually set the high/low impedance relay, which determines whether the tuner is an l-c configuration or a c-l configuration. To toggle the state ...
Page 17
Page 17 the following status items can be checked: func hold + this button status check ant (hiloz) display selected antenna c up (peak) display peak/avg setting c dn (auto) display auto/semi setting l up (scale) display power meter scale l dn (thresh) display swr tuning threshold application notes ...
Page 18
Page 18 relays, which means they only consume power when switching. When the at-100pro is idle, very little current is drawn. One of the biggest consumers of power in the at-100pro is the led display. When operating portable, you may choose to disable the led display, as described in the section on ...
Page 19
Page 19 the output circuit of a transmitter, the transmission line, and the antenna, all have a characteristic impedance. For reasons beyond the scope of this document, the standard impedance is nominally 50 ohms resistive, with zero capacitive and zero inductive components. When all three parts of ...
Page 20
Page 20 where f = forward power (watts), r = reflected power (watts) swr is measured using a device called an “swr bridge”, inserted in the transmission line between the transmitter and the antenna. This circuit measures forward and reflected power from which swr may be calculated (some meters calcu...
Page 21
Page 21 the tuning routine uses an algorithm to minimize the number of tuner adjustments. The routine first de-energizes the high/low impedance relay if necessary, then individually steps through the inductors to find a coarse match. With the best inductor selected, the tuner then steps through the ...
Page 22
Page 22 quick reference button primary function func -> button status check (func hold + button) power-up function tune (store) full tune (long press) memory tune (medium press) bypass (short press) manually store tuning parameters display relay settings ant (hiloz) toggle antenna selection toggle h...
Page 23
Page 23 care and maintenance the at-100pro tuner is essentially maintenance-free. Power limits in this manual should be strictly adhered to. The outer case may be cleaned as needed with a soft cloth slightly dampened with household cleaning solution. As with any modern electronic device, the at-100p...
Page 24
Page 24 returning your product for service returning a product to ldg is easy. We do not require a return merchandise authorization, and there is no need to contact ldg to return your product. Visit the customer support center and download the ldg product repair form. On the repair form tell the ldg...