Lectrosonics UMCWB User Manual download pdf (Page 8)

UMCWB

LECTROSONICS, INC.8

While the wide bandwidth of the multi-coupler is very

convenient, it also requires that the antennas used

with it also have a bandwidth wide enough to cover the

range of the receivers that are installed. If the entire

bandwidth from block 21 through block 29 is to be used,

the best antenna would be one of the ALP Series log

periodic models.

ALP620 Log-periodic antenna

The ALP Series antennas are ideal for use with wide-

band multicouplers, offering a directional coverage pat-

tern and a gain of 4.5 dBd. Three different models are

available to suit your speciﬁc needs.

Whip antennas can only be used if the frequency block

of the antennas is the same as the installed receivers,

or one block higher or lower. For example, block 24, 25

and 26 receivers can be used with block 25 antennas.

Whip antennas can be used as long as the frequency band

matches the receivers installed in the multi-coupler.

If a circular pattern is needed, the SNA600 dipole

model is an excellent choice, however, it is limited to

a 100 MHz bandwidth (about 4 blocks). It is tuned to

match the frequencies of the installed receivers by

adjusting the length of the elements according to the

scale on the body of the antenna. It is supplied with

a mounting strap, hardware and a rotatable mounting

block, and folds for storage.

Antenna Types and Bandwidth

The SNA600 dipole antenna folds for storage

To achieve wideband, circular coverage, two SNA600

antennas tuned to different frequency ranges can be

used with an external combiner, however, loss could

occur depending upon how they are positioned and how

much overlap exists in their tuning ranges.

To reduce the interaction between two SNA600 anten-

nas, mount them in a vertical orientation, about a half

wavelength apart, so they will be in each other’s null.

In theory, there will be some noise generated by mix-

ing the signal from the “out of band” antenna with the

intended one, but it is likely to be inconsequential in

actual use.

High freq tuning range

Low freq tuning range

2-way

combiner

Output to

multicoupler

1 2 3 4 5 6 7 8 9 10 11 12

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Lectrosonics UMCWB User Manual Page 8

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