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second to run. There is also a quick tune mode. If the SWR is below 2.0 when you press the tune
button to start a tuning cycle, the tuner will first try a memory tune routine to see if it can achieve
a low SWR without a complete re-tune. This also takes about a half second to run. If it does not
find a good match, then it runs a full tuning routine.
A Word About Tuning Etiquette
Be sure to use a vacant frequency to tune. With today’s crowded ham bands, this is often difficult.
However, do your best to avoid interfering with other hams as you tune. Your AT-100AMP’s
very short tuning cycle, often only a fraction of a second, minimizes the impact of your tuning
transmissions. Tune at reduced power whenever possible; one or two watts is plenty.
Care and Maintenance
Your AT-100AMP tuner is maintenance-free. As with any modern electronic device, your AT-
100AMP can be damaged by temperature extremes, water, impact or static discharge. LDG
strongly recommends that you use a good quality, properly installed lightning arrestor in the
antenna lead.
Technical Support
We are happy to help you with your AT-100AMP. Telephone technical support is available at
410-586-2177 weekdays from 9 am to 5pm Eastern Time. Inquiries by Fax at 410-586-8475 are
welcome, and prompt e-mail support is available at ldg@ldgelectronics.com.
Warranty and Service
Your AT-100AMP 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 be shipped to us pre-paid; we will not accept units with
postage due. A return form is provided on our web site for your convenience.
If you need to return your AT-100AMP to us for service, package it carefully, keeping in mind
that we will re-use your packaging to return the unit to you. Download the return form from our
web site (ldg@ldgelectronics.com), fill it out and return it with your tuner. A self-addressed
return-shipping label, while not required, will help insure speedy and accurate delivery of your
repaired unit. Include a full description of the problem, along with your name, address and a
phone number or e-mail address where we can reach you with any questions. Repairs average
about 3 to 6 weeks.
We will be glad to service your AT-100AMP after the warranty period has ended. We will notify
you of repair charges by phone or e-mail, and bill you after repairs are completed.
Firmware Upgrades
From time to time LDG may release upgraded firmware for the AT-100AMP, refining operation
and adding features. Your AT-100AMP is not field programmable; you will have to remove the
present chip and replace it with the upgrade chip. Upgrades are expected to cost about $10-$20,
and will be announced on our web site when available.
