FlexRadio Systems FLEX-6400 User Manual

FLEX-6400/FLEX-6600 Hardware Reference Manual
Page 41 of 45
Copyright 2018 FlexRadio Systems. All Rights Reserved.
13 ANTENNA TUNER UNIT (ATU)
The FLEX-6400/FLEX-6600 automatic antenna tuner unit (ATU) is an antenna matching
network designed to present a 50 ohm, low SWR load to the power amplifier (PA) for
efficient RF power transfer on non-resonant antenna systems.
The FLEX-6600 has an integrated ATU as a standard feature whereas the ATU for the
FLEX-6400 is a user installable option.
13.1 SPECIFICATIONS
Network Type: L Network
Antenna Connection: Unbalanced (coax)
Frequency Range: 1.8 to 54 MHz
VSWR Range: 8.3 - 300 Ohms (80m – 10m)
6.7 - 150 Ohms (160m and 6m)
Tune Power: 10W / 2W on 6m (automatically set by software)
Δ – It is not recommended to attempt repeated tuning of antennas with the ATU
connected to antenna systems that exceed the maximum VSWR on a frequency of
interest. Some antenna systems, such as physically short multiband antennas may
exhibit a very narrow range of resonance (a high Q antenna) in addition to being very
reactive. The FLEX-6400/FLEX-6600 ATU is not designed to tune these types of antenna
systems. An external antenna tuner that is designed to handle a wider VSWR range is
recommended for these types of antennas.

FlexRadio Systems FLEX-6400 Specifications

General

Brand	FlexRadio Systems
Model	FLEX-6400
Category	Transceiver
Language	English