Lectrosonics SRb_SRb5P - Manual (Page 19)

UHF Digital Hybrid Wireless ®
Rio Rancho, NM 19
Spectrum scanning with the receiver itself is the best
way to find clear operating frequencies, since it will
reveal all RF signals present in the receiver, including
those generated by IM (intermodulation).
First,
turn off all of the transmitters you intend to use
with the receiver.
Navigate to the SETUP/SCAN screen and press the
MENU/SEL button to start the scanner. The display will
switch to the Scan Window (see illustration above) and
start scanning immediately. Allow the receiver to scan
across the entire tuning range at least once, then press
the MENU/SEL button to stop the scanning.
Scroll through the screen with the UP and DOWN but-
tons and find a frequency where no RF signals (or in
the worst case, only very weak RF signals) are present.
Press the PWR/BACK button to set the receiver to this
new frequency.
Press both the UP and DOWN buttons at the same
time to switch to the Zoom View Window (see illustra-
tion above). In this view, the cursor remains fixed in the
center of the screen and the background scrolls behind
it. The frequency can be stepped up and down in 100
kHz increments using the UP and DOWN arrow buttons.
When the receiver is configured for SWITCHED diver-
sity (dual channel mode), two cursors will appear when
the scanning is stopped. Press MENU/SEL to toggle
between the two receivers. The cursor for the selected
receiver will be a dashed rather than solid line. Select
Scanning for Clear Frequencies
each receiver and use the UP and DOWN buttons to
locate a frequency with no (or very weak) RF activity.
Keep the frequencies of the two receivers at least 700
kHz apart to minimize de-sensing (short range) issues.
This spacing is a “worst case” approximation assum-
ing the transmitters are about 25 feet from the receiver
antennas.
Data gathered during a scan is stored until it is inten-
tionally erased or the power is turned off. Previous
data will remain and subsequent scans can be made
to search for additional signals or to accumulate higher
peaks.
To clear the scan memory and screens, press the back
button several times to return to the Main Window, then
press and hold the PWR/BACK button briefly. As soon
as Powering off... appears on the display, release the
button. The receiver will remain turned on, and the scan
data will be erased.
Set your transmitter to the same frequency as shown on
the receiver display, turn the transmitter on and verify
that a strong RF signal is present.
It is always good practice to go through the Multi-chan-
nel Checkout Procedure detailed on page 22.
Scan Window
RF Signal
indicators
Transmitter
Switch Settings Cursor (center bar)
SCROLL
reminders
Zoom View Window
Transmitter Switch Settings
for the currently tuned
frequency.
Dashed line (cursor)
shows the currently
selected receiver.
RF activity level.
70
1
Previously tuned
frequency
B3
Press both UP and
DOWN arrows on
control panel to switch
to the Zoom View
Press the BACK
button to return
to the Scan View
Window