Lectrosonics Venue Series (Wideband) User Manual download pdf (Page 28)

Venue Wideband Receiver

LECTROSONICS, INC.

Diagnostics

Multi-channel System Checkout

Interference can result from a wide variety of sources

including TV station signals, other wireless equipment

in use nearby, or from intermodulation within a multi-

channel wireless system itself. Regardless of how the

frequencies were coordinated, a ﬁnal checkout proce-

dure is always a good idea.

Scanning with the RF spectrum analyzer built into the

Venue system will identify external RF signals, but

it does not address the compatibility of the selected

frequencies.

The pre-coordinated frequencies on the chart on the

previous pages address in-system intermodulation,

but obviously cannot take into account RF signals from

external sources that may be present in the location

where the system will be operating.

In some cases, you can run the scanner to ﬁnd clear TV

channels, then ﬁnd enough pre-coordinated frequencies

in the tuning groups (Grp a through Grp d) to operate

on the clear TV channels. Even so, it is still a good idea

to go through the check out procedure because you

can encounter interference from other wireless, IFB and

intercom systems when you get to the production or

installation site.

1. Set up the system for testing.

Place antennas in the position in which they will be

used and connect to the receivers. Place transmit-

ters about 3 to 5 feet apart, about 25 to 30 feet from

the receiver antennas. If possible, have all other

equipment on the set, stage or location turned on

as well, especially any mixing or recording equip-

ment that will be used with the wireless system.

2. Set all receivers on clear channels.

Turn on all receivers, but leave the transmitters off.

Observe at the RF signal strength indicator for each

receiver module. If a signal is present, change the

frequency to a clear channel where no signal is

indicated. If a completely clear channel cannot be

found, select the frequency with the lowest RF level

indication. Once all receiver modules are on clear

channels, go to step 3.

3. Turn each transmitter on one at a time.

Start with all transmitters turned off. As you turn on

each one, look at the matching receiver to verify a

strong RF signal is received. Then, look at the other

receivers and see if one of them is also picking up

the signal. Only the matching receiver should indi-

cate a signal. Change frequencies on either system

slightly until all channels pass this test, then check

again to see that all channels are still clear as done

in step 2.

4. Turn each transmitter off one at a time.

With all transmitters and receivers turned on, turn

each transmitter off one at a time, in turn, and look

at the RF level indicator on the matching receiver

module. The RF level should disappear or drop to a

very low level. If it does not, change frequency on

that receiver and transmitter and try it again. When

a clear frequency is found, turn the transmitter on

and move on to the next channel.

IMPORTANT: Any time a frequency is changed on

any of the systems in use, you must start at the

beginning and go through this procedure again for

all systems. With a little practice, you will be able

to do this quickly and save yourself some “multi-

channel grief.”

Pilot Tone Bypass

Some wireless equipment uses a supersonic “pilot tone”

to control the squelch (audio mute) of a receiver module

to keep it silent until a valid signal is received. When a

signal with the correct pilot tone is received, the squelch

opens and audio is delivered to the output. Pilot tone

squelch control also eliminates transients (clicks and

pops) when transmitters are turned on and off. Pilot

tone is supported in the Digital Hybrid compatibility

modes for those systems that use it.

Pilot tone control can be bypassed as a diagnostic tool.

Bypass opens the audio output of the receiver uncondi-

tionally, allowing you to listen to any signals entering the

receiver to help identify their source. Pilot tone bypass

will also allow you to use a transmitter that has a defec-

tive pilot tone circuit.

CAUTION: When pilot tone is bypassed and

the transmitter is turned off, excessive noise

will be present. Turn the audio level down

before bypassing pilot tone.

Navigate to the PilotBP setup screen.

Select the receiver module with the Receiver Select

ButtonandrotatetheMENU/SELECTcontroltoselect

BYPASS. In this example, the pilot tone for receiver

module 1 is set to BYPASS (BYP) and the others are

set to NORMAL (NOR).

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Lectrosonics Venue Series (Wideband) User Manual Page 28

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