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About Memory Tuning
The tuning range of the AT-200PC is divided into 2,000 frequency steps. The steps are smaller at
lower frequencies where antennas are usually more reactive and frequency sensitive, and larger at
higher frequencies. Each time you transmit, the tuner measures the frequency and selects the
appropriate frequency step. There are four memories for each frequency step on each antenna
port. If the tuning parameters are the same as one of the four existing memories for that frequency
and port, they are not stored. If different, they replace one of the existing sets of parameters. In
this way, up to four different antennas can be used on each of the two ports.
When you transmit on a new frequency, the tuner tries all four sets of tuning parameters for that
frequency and port. If it finds a match among the four, it sets those parameters. If not, the tuner
completes a full tuning cycle, storing the new parameters for that frequency and port. As you use
your tuner, it literally learns the performance of up to four antennas on each of the two ports,
storing their tuning parameters for virtually instant re-use.
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-200PC’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-200PC tuner is essentially maintenance-free; just be sure to observe the power limits
discussed in this manual. The outer case may be cleaned as needed with a soft cloth slightly
dampened in household cleaning solution. As with any modern electronic device, your AT-200PC
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-200PC. 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-200PC 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-200PC 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, 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
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