AKG Acoustics WMS 400 SELECTING, PLACING, and Using Antennas, Cable position a Cable position B

AKG WMS ANTENNA TECHNOLOGY

HOW TO USE ANTENNAS

SELECTING, PLACING, AND USING ANTENNAS

Cable attenuation setting vs. cable length in complex systems

The CLA cable attenuation setting on the booster(s) and antenna splitter(s) depends on the frequency band, antenna type, cable type, cable length, and the position of the cable within the antenna line.

For details on setting up an antenna network refer to the PS 4000 manual.

Frequency bands I + II

	Cable position A			Cable position A			Cable position A				Cable position B
SRA2B > AB 4000 or PS 4000			RA 4000 B > AB 4000 or PS 4000			SRA1 > AB 4000 or PS 4000				AB 4000 > AB 4000 or PS 4000
RG 58	RG 213	CLA setting	RG 58	RG 213	CLA setting	RG 58		RG 213	CLA setting	RG 58		RG 213	CLA setting
(m)	(m)	(dB)	(m)	(m)	(dB)	(m)		(m)	(dB)	(m)		(m)	(dB)
53-57	111-121	0	38-43	79-89	0	8-13		16-26	0	41-46		87-97	0
48-53	100-111	2	33-38	68-79	2	3-8		5-16	2	36-41		76-87	2
43-48	89-100	4	28-33	58-68	4	0-3			4	31-36		66-76	4
38-43	79-89	6	23-28	47-58	6					26-31		55-66	6
33-38	68-79	8	18-23	37-47	8					21-26		45-55	8
28-33	58-68	10	13-18	26-37	10					16-21		24-45	10
23-28	47-58	12	8-13	16-26	12					11-16		24-34	12
18-23	37-47	14	3-8	5-16	14					6-11		13-24	14

Antenna cables

The amount of signal attenuation across a cable depends on the RF transmission frequency and the quality of the cable.

Note: Belden Cable offers some medium-gage wideband cable types with extremely low attenuation values up to 3.2 dB for 100 feet (30 m) at 700 MHz.

Cable type	Impedance	Attenuation for 100 feet (30 m)	Attenuation for 100 feet (30 m)	Gage
		at 700 MHz	at 200 MHz
RG-58C/U	50 Ohm	17.0 dB	7.3 dB	Small
RG-58/U	50 Ohm	11.7 dB	5.6 dB	Small
RG-59/U	75 Ohm	8.9 dB	4.5 dB	Small
RG-8/U	50 Ohm	3.6 dB	1.8 dB	Large

Single-channel system with SRA 1 passive antennas For a single-channel system, you can connect the antennas direc- tly to the receiver.

1. Measure the cable runs between the receiver and each antenna.

2. Refer to the table to find out whether you will need to break the cable run down into several cables and use antenna boosters.

3. Connect the antennas to the receiver. If you use antenna boo- sters, you will need a remote power adapter for each booster.

4. Check that the AC mains voltage stated on each power supply is identical to the AC mains voltage available at the venue. Using power supplies for a different AC voltage may cause damage to the unit.

Single-channel system with active antennas

1. Measure the cable runs between the receiver and each active antenna.

2. Refer to the table below to find out whether you will need to break the cable run down into several cables and use antenna boosters.

3. Connect the antennas, antenna boosters, remote power adapter(s), and the receiver as shown in the diagram.

4. Check that the AC mains voltage stated on each power sup- ply is identical to the AC mains voltage available at the venue. Using power supplies for a different AC voltage may cause damage to the unit.

48 www.akg.com