LDG AT-200Pro Manual - page 17
17
Application Notes
Mobile operation
The AT-200Pro is perfectly suited to mobile operation. You can install it under the dash along
with your transceiver, or remotely in the trunk. The only requirements are that the tuner remain
dry, and that you provide a fused source of DC power in accordance with the specifications. The
AT-200Pro does not include an internal fuse; you must provide one in the DC line. LDG
recommends a 2 Amp "fast blow" fuse. Make sure the tuner is well grounded to the car body.
To install the unit under the dash, you can "homebrew" a bracket. You can also use Velcro tape,
although the adhesive tends to soften in hot weather. In the trunk, Velcro works well to secure the
unit to the trunk floor. Simply run coax from your transceiver to the 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,
the tuner has finished tuning. Most of the time this will happen very quickly, as the AT-200Pro
tunes from memory in less than a second.
When to use Auto mode
Auto mode is most useful when you are often changing frequencies and bands (a contest, for
instance). With memory operation, Auto mode will retune almost instantly whenever you transmit
on a new frequency. On the other hand, if your antenna SWR is relatively flat across the band of
frequencies you're using, retuning might not be necessary, and semi-automatic mode would be
preferable.
Tuner
Xcvr
DC
2A