FLEX-6000 Signature Series – FLEX-6000 Hardware Reference Manual
Page 29 of 48
Copyright 2016 FlexRadio Systems. All Rights Reserved.
7.10.2 MIC vs. LINE Use
The balanced input can be used as a microphone level or a line level audio input. The
microphone level is suitable for a dynamic microphone. The balanced input does not have
any DC bias capability. If your microphone requires bias power (5VDC) or phantom power
(48VDC), an external power supply is required.
7.10.3 Line Level
There are a number of different definitions of “line level”. The audio input device in the
FLEX-6000 series radios is designed for a “consumer line level” specification. This is defined
as -10 dBV. If you plan to use “professional line level” devices to feed your radio, you will
need to reduce the output level so that it does not exceed the -10 dBV level (-8 dBu). The
hardware input will clip around 0 dBm (~-2.2dBV).
7.11 GPS ANTENNA INPUT (W/GPSDO OPTION)
If the radio is equipped with the optional GPSDO, this female SMA connector is for
connecting the included GPS antenna. The GPSDO provides DC bias for the antenna
preamp. It can work with antennas that require either 3.3 Volt or 5 Volt DC bias.
7.12 REMOTE POWER ON INPUT
This RCA connector is provided for remote power-on functionality. When the Remote
Power ON feature is enabled, shorting this input to ground will activate the radio - opening
this connector will disable power on the radio. Refer to the SmartSDR documentation for
information on how to configure this input. (Note: 3.3VDC Max Input.)
7.13 EXTERNAL AMPLIFIER ALC INPUT
This RCA connector is provided to receive an ALC signal from an external amplifier. The
shell is ground, and the pin is a negative going DC voltage, zero to -4 Volts.
! – VOLTAGES BELOW -4VDC MAY DAMAGE THE ALC INPUT.
Δ – Please note this input is provided as a safety measure for external amplifiers. It is
NOT meant to be used in regular operation as an active power control input or to modify
the “attack” of an external amplifier. Almost all modern HF amplifier manufacturers
discourage the use of ALC in normal operation. In fact, many amplifiers do not have ALC
implemented. The SmartSDR Software User’s Guide describes the recommended
method for setting the power level on an external amplifier on a per-band basis.
7.14 TX REQUEST INPUT (INTERLOCK)
This RCA connector is provided to receive an interlock signal from external amplifiers, or
other external equipment. When enabled it will prevent the FLEX-6000 from going to
transmit. The TX Request Input can be enabled with a 3.3V to 5V logic signal. The circuit is
a 74LVC14 CMOS Schmidt trigger logic input with a 2.7k pullup to +3.3V. The IC is 5V
tolerant so you can drive it with TTL levels as well. It can also be driven with an open
collector transistor or open drain MOSFET. Grounding the center pin of this connector will
prevent transmit from engaging. Refer to the SmartSDR documentation for information
about how the interlock system works and how to determine what is preventing transmit.
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