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AT-100AMP

Automatic Input 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

Copyright © LDG Electronics 2005. All rights reserved.

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Summary of Contents for AT-100AMP

Page 1: ...uner 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 Copyright LDG Electronics 2005 All rights reserved ...

Page 2: ...pplication Notes 5 Operation 7 Theory Of Operation 8 Some Basic Ideas About Impedance 8 Transmitters Transmission Lines Antennas and Impedance 8 The LDG AT 100AMP 10 A Word About Tuning Etiquette 11 Care and Maintenance 11 Technical Support 11 Warranty and Service 11 Firmware Upgrades 11 Feedback 12 ...

Page 3: ...5 watt power range SSB and CW 1 8 to 54 0 MHz coverage Built in frequency sensor Provides automatic input tuning for any amplifier Tunes 6 to 1000 ohm loads 16 to150 on 6M Over 4 000 memories for nearly instant retuning Tuning time 0 2 to 2 5 seconds full tune 0 2 second memory recall Uses latching relays retains tuned setting indefinitely even when DC power is removed Enhanced tuning algorithms f...

Page 4: ...on and requires only three connections 12 vdc RF in and RF out As you operate the AT 100AMP automatically tunes the input of your amp in seconds so the exciter is always optimally matched to the amp The AT 100AMP s 4 000 memories automatically store tuning parameters for your favorite bands and frequencies for nearly instant recall when you transmit on or near the same frequency again The AT 100AM...

Page 5: ...ally for the tuner as far from the RF components as possible The AT 100AMP is not especially sensitive to stray RF but inside a 1KW amp there s plenty to go around The more shielded the tuner is the better Make sure the bottom of the tuner PC board does not short on the chassis Use spacers to keep it from touching However make sure the mounting screws make good contact with the ground lands around...

Page 6: ...cts between the single hole at the top of this picture ground and the left most hole in the row of four The tune indication appears between the right most hole and ground Tune Switch SPST Normally Open This point goes to ground during a tuning cycle Tune Switch SPST Normally Open This point goes to ground during a tuning cycle ...

Page 7: ...5 2 5 seconds and long more than 2 5 seconds A short press of the TUNE button puts the tuner in Bypass mode RF goes directly from your exciter to your amp without matching Another short press resets the last tuned state A medium press starts a memory tuning cycle stored tuning parameters for the present frequency will be used if available If not a full tuning cycle begins A long press starts a ful...

Page 8: ...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 9: ...ssipated 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 pow...

Page 10: ...roduce 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 they are used to calculate SWR in real time The relays operate from DC supplied by the power input jack The total current drawn by the AT 100AMP depends primarily on the number of energized relays with the maximum current drai...

Page 11: ... 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 be shipped to us pre paid we will not accept units ...

Page 12: ...n the AT 100AMP we ll send you a free upgrade as a thank you We encourage everyone who uses the AT 100AMP 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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