Rf bypassing (um700), Line level signals (um700), Encryption key cables – Lectrosonics UT700 User Manual
Page 25: Wiring hookups for different sources (um700), Ut700key cable, Um700key cable, Preferred locations for bypass capacitors, Alternate locations for bypass capacitors, Encrypted digital wireless system, Rio rancho, nm 25
Encrypted Digital Wireless System
PIN 5 - 40 k high impedance, line level input for
tape decks, mixer outputs, musical instruments, etc.
PIN
1
SHIELD
AUDIO
BIAS
3 WIRE ELECTRET MIC
POSITIVE BIAS
2
3
1
2
3
4
5
4
TA5F
5
PLUG
PIN
SHIELD
1
2
2 WIRE ELECTRET MIC
AUDIO
3
POSITIVE BIAS
1
2
3
4
5
4
TA5F
5
PLUG
PIN
1
SHIELD
BIAS
AUDIO
3 WIRE ELECTRET MIC
NEGATIVE BIAS
2
3
4
1
2
3
4
5
TA5F
5
PLUG
PIN
SHIELD
AUDIO
2 WIRE ELECTRET MIC
NEGATIVE BIAS
1
2
3
4
1
2
3
4
5
TA5F
5
PLUG
SLEEVE
PIN
SHIELD
1
2
AUDIO
TIP
3
LINE LEVEL
1
2
3
4
5
4
RCA or 1/4 " PLUG
TA5F
5
PLUG
3
1
2
PIN
PIN
1
SHIELD
1
2
2
3
3
DYNAMIC
Dynamic LO Z mic or electret with
4
1
2
3
4
5
TA5F
manufacturer’s power supply.
MIC LEVEL
5
PLUG
Wiring Hookups for Different Sources (UM700)
RF Bypassing (UM700)
Some mics require RF protection to keep the transmit
ter signal from affecting the capsule, even though the
transmitter input circuitry is already RF bypassed (see
5-Pin Input Jack Wiring schematic diagram ).
If the mic is wired as directed, and you are having
difficulty with squealing, high noise, or poor frequency
response, RF is likely to be the cause.
The best RF protection is accomplished by installing
330 pF bypass capacitors at the mic capsule. If this is
not possible, or if you are still having problems, capaci
tors can be installed on the mic wires inside the TA5F
connector housing.
The 330 pF capacitors are available from Lectrosonics.
2 WIRE MIC
3 WIRE MIC
Please specify the part number for the desired lead style.
Leaded capacitors:
P/N 15117
Leadless capacitors:
P/N SCC330P
Note: The M150-7005P microphone is bypassed
correctly for use with the UM700 Encrypted Digital
Transmitter and is the recommended lavaliere
microphone for the 700 Series wireless
microphone system.
Line Level Signals (UM700)
The normal hookup for line level signals provides 40 dB
of attenuation allowing signal levels up to 30 V to be
applied without limiting. The normal hookup configura
tion can be modified for situations that require higher
levels of headroom, or lower levels of attenuation.
PIN
SHIELD (GND)
1
2
Normal Hookup
3
4
1
2
3
4
5
AUDIO
TA5F
5
PLUG
PIN
SHIELD (GND)
1
2
More Headroom
3
1
2
3
4
5
4
100k
AUDIO
TA5F
5
PLUG
PIN
SHIELD (GND)
1
Lower Line Level
2
Hookup
3
1
2
3
4
5
4
AUDIO
TA5F
5
PLUG
Normal hookup connects the Signal Hot (Audio) to pin
5, Signal Gnd (Shield) to pin 1, and both pins 3 and 4
jumped to pin 1.
If even more headroom is required, insert a 100 k
resistor in series with pin 5 (Audio). Put this resistor
inside the TA5F connector to minimize noise pickup.
For situations where lower than normal line levels (less
than 1 V) are expected, use the Lower Line Level Hook
Up: Signal Hot (Audio) to pin 5, Signal Gnd (Shield) to
pin 1, and pin 4 jumpered to pin 1. This configuration
provides 20 dB attenuation allowing signal levels up to 3
V to be applied without limiting.
Encryption Key Cables
Each digitally encrypted transmitter uses a different
encryption key cable. The configuration of these cables
is listed below.
SLEEVE
SLEEVE
TIP
Mini Plug
TIP
3.5 mm Plug
Preferred locations for bypass capacitors
CAPSULE
CAPSULE
SHIELD
AUDIO
SHIELD
AUDIO
BIAS
UT700KEY CABLE
SLEEVE
SHIELD
3
2
1
DATA
2
3
1
4
5
PIN
TIP
TA5F
Mini Plug
4
CONNECTOR
TA5F
5
TA5F
CONNECTOR
Alternate locations for bypass capacitors
UM700KEY CABLE
PLUG
Rio Rancho, NM
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