Lectrosonics R400a User Manual download pdf (Page 16)

R400A

LECTROSONICS, INC.

Frequency Coordination

Intermodulation interference is a problem constantly

lurking in the background, especially when working

in environments where simultaneous productions are

taking place in close proximity. In these cases, proper

frequency coordination is a must. There are basically

three methods to coordinate frequencies:

• Usethebuilt-infrequencygroups

• Scanforclearchannels(SeeSmartTune

™

and Scan Function.)

• CallLectrosonics

Frequency Compatibility Chart

Considering that multiple systems can be used in a produc-

tion, coordinating frequencies to minimize interference

between these channels can be a daunting process.

The Frequency Compatibility Chart was designed to as-

sist in minimizing intermodulation problems for multiple

channel wireless systems. It does this by identifying

potential intermodulation problems and listing compat-

ible frequencies and frequency groups. This chart can be

used with all Digital Hybrid Wireless

(400 Series) receiv-

ers.

The chart divides the frequency blocks used in the North

American market into Set 1 and Set 2, then further di-

vides each row into two groups of eight frequencies each.

These frequency groups are labeled A and B and C and

D, and correspond to the factory set frequency groups

(Groups A, B, C and D) described in the Tuning Setup

Screen.

Understanding and using the Frequency Compatibility

Chart is not as difﬁcult as it ﬁrst appears. There is a pat-

tern of compatible frequencies that becomes apparent, as

illustrated on the Frequency Compatibility Diagram on the

next page.

The following guidelines should be observed when

selecting compatible frequencies:

1. Set 1 and Set 2 are NOT compatible.

Proper coordination requires that all frequencies be

taken from either Set 1 or Set 2, but not a combina-

tion of the two.

(The remaining guidelines make the assumption

that you are choosing frequencies within one

frequency set.)

2. Frequencies within an individual frequency

block in the same Set are compatible.

(Example: All 16 frequencies in Block 25,

Group A and B)

3. Frequencies from adjacent blocks, but different

Groups are compatible.

(Example: Block 21, Group C frequencies

are compatible with Block 22, Group D frequencies)

4. Frequencies from adjacent blocks and the same

Group are NOT compatible.

(Example: Block 26, Group B frequencies

are NOT compatible with Block 27, Group B

frequencies)

It is highly recommended that you choose frequencies

that are in the same set and same group.

By following these guidelines, it is possible to locate a

number of operating frequencies early in the production

that are free from intermodulation, then reﬁne the list

during system setup.

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Lectrosonics R400a User Manual Page 16

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