FLEX-6400/FLEX-6600 Hardware Reference Manual
Page 36 of 45
Copyright 2018 FlexRadio Systems. All Rights Reserved.
10.1 TRANSMIT POWER CONSIDERATIONS
The default transverter output is 0 dBm (1.0 mW). The FLEX-6400/FLEX-6600 can
produce an output on the XVTR port up to +15dBm for frequencies below 54MHz. If your
transverter requires a higher-level input, it is recommended that you either modify the
transverter for a lower power input or provide an amplifier to amplify the transmit signal
before passing to the transverter.
10.2 RF CONNECTIONS - COMMON IF
For a common IF configuration, the Common IF port of the transverter should be
connected to the XVTR port on your FLEX-6400/FLEX-6600. This will be the only RF
connection between the transverter and the radio.
10.3 RF CONNECTIONS - SPLIT IF
For split IF transverters, the TX IF of your transverter should be connected to the XVTR
port on the FLEX-6400/FLEX-6600. The RX IF port should be connected to either RX-A or
RX-B (FLEX-6600 only).
While it is technically feasible to use the ANT1 or ANT2 ports for receive, this is not
recommended since these ports can produce high-power RF at any time that could
damage your transverter.
10.4 PTT CONNECTIONS
The radio will need to provide a PTT signal to place the transverter into transmit mode.
Most transverters will have a grounded-PTT input. This should be connected to a FLEX-
6400/FLEX-6600 TX1, TX2 or TX3 output to cause the transverter to transmit. Depending
on the design of the transverter, a weak pull-up may be required.
10.5 SEQUENCERS
In some transverter applications, notably those that include a split RF output,
preamplifiers and/or power amplifiers, a sequencer may be used. The specific details of
connecting and configuring a sequencer are beyond the scope of this document, but the
TX1, TX2 or TX3 output from the radio are generally used as an input to the sequencer to
allow it to properly switch and enable/disable each component in your lash-up.
10.6 MULTIPLE TRANSVERTERS
At this time, no band data is provided by the radio and this may provide an effective limit
of one transverter at a time. FlexRadio anticipates adding band data in a later release of
SmartSDR that would assist remote switching hardware in selecting between multiple
transverters.
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