IQC 5000B Operation Manual
59
Selecting RF or IQ Playback
The IQC5000B is capable of I/Q baseband and RF playback. The I/Q Baseband playback is intended for normal use,
RF playback capability should be used for testing and system validation only. Do not use RF Playback for normal use.
To play back a recording at an RF fixed frequency of 2.4GHz, sel
ect RF under Output. To play back baseband I/Q data
to be mixed in an external vector signal generator, select IQ.
Setting Playback Loop Count
The loop count is how many times a selected file should be played. A loop count of 1 only plays the file once. A loop
count of 2 will begin a second playback of the file immediately after the first playback has ended.
To change the loop count, enter the desired value in the Count bo
x.
Setting Playback Start/Stop Positions
The start/stop positions dictate which portion of the file is played back. The default values represent a full file
playback.
Enter the start and stop positions in
the Start and Stop boxes, respectively. To specify time, use units ns, us, ms, M,
or H (nanoseconds, microseconds, milliseconds, seconds, minutes or hours). To specify a sample length, enter the
amount of samples without units to playback.
As an example, modifying the start position
of a 5 second long file to 1s and the stop position to 3s will play the 2
seconds of the file after 1 second into the file.
Setting the Playback Multiplier
The Playback Multiplier is an option to shift the bits of the outgoing data through the DAC. For low amplitude files,
this makes better use of dynamic range. Unless it is known that a file is low amplitude, it’s typically best to leave this
option at x1.
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