FLEX-6000 Signature Series – Maestro User Guide
Copyright 2024 FlexRadio, Inc. All Rights Reserved. | Page 84
18.1.2 Available SCUs
The total available number of SCUs (Spectral Capture Units – see section 10.2.1) is determined by
the radio model according to the following table:
When the RX Antenna selection is made on a Slice or Panadapter, this associates that Antenna Port
(such as ANT1, ANT2, RX A, etc.) with an SCU. If there is no available SCU when changing Antenna
Ports, an existing SCU must be moved to the newly selected RX Antenna. Put another way, a single
SCU radio can only listen on a single RX Antenna Port at a time. This means that if two Stations are
connected to a FLEX-6500 and both of them are using ANT1 for RX, if one of the Stations changes
the RX Antenna to ANT2, all Panadapter and Slice resources on both Stations will move to ANT2.
The situation is easier to handle when using a dual SCU model like the FLEX-6600 or FLEX-6700.
This allows up to 2 RX Antennas to be in use at a time. Even with two SCUs, they can still run into
situations where both SCUs are in use, and changing an antenna may switch resources on any
Stations that were using the original Antenna Port that is being changed. This sharing will likely be
familiar to those who have operated a FLEX-6000 radio, but it can be confusing if your RX Antenna
settings change as a result of settings that another Station has chosen.
Similarly, the Gain setting (Preamp/Attenuator) for the SCU is shared just as it is in a single Station
setup. However, it may not be as obvious why the Gain setting is changing when another Station
changes it unless it is understood that the SCUs are a shared resource.
18.1.3 Total Available Slices and Panadapters
The total available number of Slices and Panadapters is determined by the radio model according to
the following table:
multiFLEX allows these resources to be split across multiple Stations flexibly. One station on a
FLEX-6600 might have 3 Slices in use while another has 1 Slice. When all of the Slices are in use, a
Slice must be closed before another will be allowed to be opened. The same rules apply to
Panadapters and Waterfall displays. This means that on a FLEX-6500 if two Stations are connected
and Station 1 opens four Panadapters, Station 2 will not be able to open any Panadapters until one
or more Panadapters on Station 1 are closed thus freeing up those shared resources.
18.1.4 Hardware PTT Inputs – Introducing Local PTT
In a system with multiple Stations connected, it isn’t immediately clear what should happen when a
Hardware PTT is used with the Radio. Take for example a FLEX-6600 with 2 Stations connected:
Station 1 using SmartSDR for Windows is called FLEXDEV4 and Station 2 is using his FLEX-6600M
Front Panel. In this scenario, both of these Stations are being operated by the same person in the
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