The LDG AT-100ProII is a general purpose automatic tuner
suitable for any amateur application. It covers 1.8-54 MHz, and features a
two-position antenna switch allowing instant switching between two antennas.
The AT-100ProII requires just 1 watt for operation but will handle up to 125
watts, making it suitable for everything from QRP to a typical 100 watt
Like all LDG tuners the AT-100ProII operates automatically,
beginning a tuning cycle whenever the SWR exceeds a preset limit. The AT-100ProII
also features LDG’s advanced memory tuning, providing 2,000 memory locations; when
tuning near a previously used frequency it will recall the settings for nearly
instant tuning. It learns your favorite frequencies and bands as you use it. You
can also start a tuning cycle manually whenever necessary.
Large, easy-to-read LED bargraphs show forward and reverse
power power in peak or average mode, and SWR. Two power scales are provided:
12.5 watts and 125 watts. The bargraphs also indicate tuner status and input
The AT-100ProII uses LDG’s state-of-the-art, processor-controlled
Switched-L tuning network. It will match dipoles, verticals, inverted-Vees or
virtually any coax-fed antenna. With an optional LDG balun, you can also use
longwires or antennas fed with ladder-line. It handles 100 watts SSB or 50
watts FM/Digital when used with a solid-state transceiver; vacuum tube
transmitters cut the power ratings about in half.
The AT-100ProII uses latching relays which retain the tuned
configuration indefinitely even when the unit is powered powered down. The
latching relays also enable extremely low power consumption; when not actively
tuning the AT-100ProII draws next to no power at all. This makes it suitable
for portable or mobile operation from batteries.
All LDG tuners come with a two year fully transferable
warranty, and LDG’s legendary customer service. Contact your LDG dealer to