LDG AT-200Pro Manual Download

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AT-200Pro

Automatic Antenna Tuner

Manual Version 1.0

LDG Electronics

1445 Parran Road, PO Box 48

St. Leonard MD 20685-2903 USA

Phone: 410-586-2177 Fax: 410-

586-8475

[email protected]

www.ldgelectronics.com

Summary of Contents for AT-200Pro

Page 1: ... 200Pro Automatic Antenna Tuner Manual Version 1 0 LDG Electronics 1445 Parran Road PO Box 48 St Leonard MD 20685 2903 USA Phone 410 586 2177 Fax 410 586 8475 ldg ldgelectronics com www ldgelectronics com ...

Page 2: ...de Short press 13 Power and SWR Indication 14 Off Mode 14 Advanced Operation 14 Operation with an LDG radio interface 15 Application Notes 17 Mobile operation 17 When to use Auto mode 17 When to use Peak mode 18 When to turn the LEDs off 18 RF Noise 18 MARS CAP coverage 18 Error indications 18 Theory Of Operation 19 Some basic ideas about impedance 19 Transmitters transmission lines antennas and i...

Page 3: ...c wide range switched L tuner in 1995 From its laboratories near the nation s capitol LDG continues to define the state of the art in this field with innovative automatic tuners and related products for every amateur need Jumpstart or Real hams don t read manuals Ok but at least read this one section before you transmit 1 Connect the antenna jack on your transceiver to the Tx jack on your AT 200Pr...

Page 4: ...nwood and Yaesu available Power requirements 11 to 15 volts DC at 750 mA max during tuning Enclosure 9 x 7 x 2 inches Weight 2 pound An important word about power levels The AT 200Pro is rated at 250 watts maximum power input at most Many ham transmitters and transceivers and virtually all amplifiers output well over 250 watts Power levels significantly exceeding specifications will definitely dam...

Page 5: ... C Dn Manually decrease capacitance L Up Manually increase inductance L Dn Manually decrease capacitance Func Selects alternate functions for the other six buttons see below PWR LED meter indicates forward power in 25 and 250 watt ranges SWR LED meter indicates SWR while tuning or transmitting After tuning it automatically enters a deep sleep state in which it draws only about 10 milliamps The tun...

Page 6: ...ntenna connector 1 marked Ant 1 standard SO 239 socket Antenna connector 2 marked Ant 2 standard SO 239 socket DC power in 2 5 by 5 5 mm power jack marked Power center positive Stereo 1 8 jack marked Radio for connecting a control cable to a compatible transceiver Ground connector wing nut ...

Page 7: ...ate antenna from the front panel see Operating Instructions Your AT 200Pro can interface directly with many popular transceivers enabling their Tune button to start a tuning cycle and in most cases providing power to the tuner Optional cables and interface adapters are available from LDG for many Alinco Icom Kenwood and Yaesu transceivers If you are using a transceiver interface plug the adapter i...

Page 8: ...h antenna except for Antenna selection Startup Options Your AT 200Pro has two startup commands invoked by holding down one or more keys while applying DC power to the unit usually by plugging in the coaxial power connector Version display Press and hold Func while powering up This will display the version number of the firmware in your tuner on the LED meters The first digit of the version number ...

Page 9: ... meters indicating Function mode Function mode will time out after a few seconds and a down arrow display will appear subsequent key presses must occur while function mode is still active You can also cancel the function mode by momentarily pressing the Func button a second time The status check functions require you to press and hold the Func button The following display is shown during function ...

Page 10: ...y want to use the 12 5 watt scale when operating QRP to provide greater resolution To toggle between these two scales press and release the Func button Then press and release the L Up button The LED marked 20 or 250 will light momentarily to indicate the 25 or 250 watt scale respectively The rightmost LED blinks at 30 or 300 watt over range Automatic Tuning Mode you can set your AT 200Pro to autom...

Page 11: ...ggle the Hi Lo Z setting press and release the Ant button The LEDs will show the following patterns to indicate low and high impedance This setting is relevant only when you are manually adjusting the match using the C and L buttons It is automatically set when you run any automatic tuning cycle Antenna Selection Press the Ant button to toggle between Ant 1 and Ant 2 the default is Ant 1 The LED d...

Page 12: ... them to the two antenna ports as needed Think of it you could be using a Yagi Quad Loop or Vee on the Ant A port and a Dipole Vertical Longwire or J Pole on the Ant B port connecting them as needed or switching them through an external coax switch and each of them will have 2 000 dedicated memories When you transmit on or near a memorized frequency again the tuner finds the best match for that po...

Page 13: ... saving the result when finished for future operation on that frequency In this way your AT 200Pro learns the longer you use it the more closely it adapts itself to the bands and frequencies you use You will probably use Memory Tuning most of the time it takes advantage of any stored tuning settings but automatically defaults to a Full Tuning cycle if no stored data is available Memory frequency s...

Page 14: ...ease and decrease capacitance and inductance respectively Momentarily press any of these buttons to see the present setting the value is indicated on the display C on the upper display L on the lower left justified that is the lowest order relay is shown on the left To changes these values press repeatedly or hold any of these buttons you will see the value change Then key your transmitter to obse...

Page 15: ...ary Function Func Button Status Check Func Hold Button Power Up Function Tune Manual Tune Long Auto Tune Medium Bypass Short Manually Store Tuning Parameters Present Relay Settings NA Ant Switch between Ant 1 and Ant 2 connectors on back panel Toggle Hi Lo Impedance Present Antenna Ant 1 NA C Up Manually increase capacitance Toggle Power meter Peak Average Present PWR Meter Mode Avg NA C Dn Manual...

Page 16: ...d on power up for All Reset Peak Avg Mtr Mode NA Hi Lo Imp Sel Ant NA Auto Man Tune Mode NA Man Store Rly Settings NA 12 125 Watts Mtr Scale NA Auto Thresh Pres Thresh NA Func C Up L Up Ant C Dn L Dn Tune Power NA NA Version AT 200Pro Key Reference ...

Page 17: ...he tuner run a fused DC line to the tuner and connect your mobile antenna Simply set the tuner to Automatic mode and you re ready to go the tuner will adjust the match as needed whenever you transmit on a new band or frequency You can observe the progress of the match on your rig s SWR meter or on the power output meter not while driving keep your eyes on the road When the reading stops changing t...

Page 18: ...perating CW with break in while using the Peak power display This should present no problem as the Peak mode is not very useful on CW The extremely short tuning cycle minimizes the impact of the noise the tuner creates no RF noise while not tuning MARS CAP coverage Your AT 200Pro provides tuning continuously over its specified range not just in the ham bands This makes it useful for MARS or CAP op...

Page 19: ...exhibit resistance and impedance in the form of capacitive or inductive reactance Transmitters transmission lines antennas and impedance The output circuit of your transmitter the transmission line and the antenna all have a characteristic impedance For reasons too complicated to go into here the standard impedance is about 50 ohms resistive with zero capacitive and inductive components When all t...

Page 20: ...issipated in the tuner as heat never reaching the antenna at all A tuner simply fools your transmitter into behaving as though the antenna were resonant avoiding any damage that might otherwise be caused by high reflected power Your antenna should always be as close to resonance as practical where F Forward power watts R Reflected power watts SWR Lookup Table Find SWR at intersection of forward po...

Page 21: ...power sensors produce a calibrated DC voltage proportional to the forward and reverse RF power levels These two voltages are read by the ADCs in the microprocessor Once in a digital format the they are used to calculate SWR in real time The relays operate from DC supplied by via the power input jack The total current drawn by the AT 200Pro depends primarily on the number of energized relays with t...

Page 22: ...ervice Your AT 200Pro is warranted against defects in parts or workmanship for two years from purchase The warranty does not cover damage due to abuse or exceeding specifications This warranty applies to the original purchaser only it is not transferable A copy of the receipt showing the purchaser s name and the date of purchase must accompany units returned for warranty service All returns must b...

Page 23: ...e or hardware please send us a description If we incorporate your idea in the AT 200Pro we ll send you a free upgrade as a thank you We encourage everyone who uses the AT 200Pro to contact us card letter or e mail preferred telling us how well it works for you We are also always looking for photographs of our products in use we frequently place such pictures on our Web site www ldgelectronics com ...

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