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UM400a

LECTROSONICS, INC.

1

Item

Replacement wire belt clip
Replacment whip antenna

Replacement Parts and Accessories

UHF Transmitter Antenna Specifications

All Lectrosonic UHF transmitter antennas follow the color code specifications in the chart below to identify operating 

frequency block range.  (The frequency block range is engraved on the ouside housing for each individual transmitter.)
If a situation exists whereby the antenna is defective and the antenna cap is missing, refer to the following chart to 

determine the correct replacement antenna.  

  BLOCK 

FREQUENCY 

CAP 

 ANTENNA 

   

RANGE 

COLOR 

 WHIP LENGTH

20

512.000 - 537.500

Black

4.98”

21

537.600 - 563.100

Brown

4.74”

22

563.200 - 588.700

Red

4.48”

23

588.800 - 614.300

Orange

4.24”

24

614.400 - 639.900

Yellow

4.01”

25

640.000 - 665.500

Green

3.81”

26

665.600 - 691.100

Blue

3.62”

27

691.200 - 716.700

Violet (Pink)

3.46”

28

716.800 - 742.300

Grey

3.31”

29

742.400 - 767.900

White

3.18”

30

768.000 - 793.500

Black-w/Label

3.08”

31

793.600 - 819.100

Black-w/Label

2.99”

32

819.200 - 844.700

Black-w/Label

2.92”

33

844.800 - 865.000

Black-w/Label

2.87”

944

944.100 - 951.900

Black-w/Label

(contact factory)

Model/Part Number

Lectrosonics #BCWire
Lectrosonics AMM (xx) - specify frequency block (xx)

Summary of Contents for UM400a

Page 1: ...equency Synthesized 100 mW UHF Belt Pack Transmitter INSTRUCTION MANUAL Rio Rancho NM USA www lectrosonics com Fill in for your records Serial Number Purchase Date Featuring Digital Hybrid Wireless Te...

Page 2: ...UM400a LECTROSONICS INC...

Page 3: ...ll Off 7 Belt Clip 7 Battery Installation 8 Operating Instructions 8 Selecting the Compatibility Mode 8 Attaching a Microphone and Adjusting Gain 9 Operating Notes 9 Adjusting the Transmitter Frequenc...

Page 4: ...orma See 5 Pin Input Jack Wiring for details UM400a Block Diagram General Technical Description tion via an analog FM wireless link This proprietary algorithm is not a digital implementation of an ana...

Page 5: ...rious RF from the wrong transmitters can t open the receiver squelch Input Limiter The transmitters employ a digitally controlled analog audio limiter just before the analog to digital converter The l...

Page 6: ...ntrol Modulation LEDs ANTENNA Jack Power LED 1 6M 100K Frequency Select Switches 0 1 2 3 4 5 6 7 8 9 A B C D E F 0 1 2 3 4 5 6 7 8 9 A B C D E F Low Frequency Roll Off Control Controls and Functions N...

Page 7: ...block Frequency Select Switches Two 16 position rotary switches adjust the center fre quency of the carrier The 1 6M is a coarse adjustment and the 100K is the fine adjustment Not available on earlier...

Page 8: ...es transmitter 1 Ensure the battery is good 2 Turn off the transmitter 3 With a small screwdriver one is included with your unit set the Frequency Select Switches to CC for Change Change 4 Power up th...

Page 9: ...tly or glow a steady red This condition may reduce the dynamic range of the audio signal If the audio level is too low neither LED will glow or only the 20 LED will glow green This condition may cause...

Page 10: ...Audio Amplifier BIAS MIC BIAS SELECT LINE IN GND 30uF 6 VDC Servo Bias Pin 4 to Pin 1 0 V Pin 4 Open 2 V Pin 4 to Pin 2 4 V To Limiter Control 30uF 750 Ohm 100 Ohm 2 7K 200 Ohm 3 3uF 100 Ohm Audio Inp...

Page 11: ...nections A common mistake is to use the connector body as an audio ground The connector body is already used as an RF ground on VHF models and no other use is permitted NOTE This termination is requir...

Page 12: ...e mic is wired as directed and you are having dif ficulty with squealing high noise or poor frequency response RF is likely to be the cause The best RF protection is accomplished by installing RF bypa...

Page 13: ...a three wire microphone such as a COS 11 very quick and easy However these wirings will not work with older Lectrosonics transmitters such as the UM400 UM200 etc If you need the two wire Countryman B...

Page 14: ...g chart to determine the correct replacement antenna BLOCK FREQUENCY CAP ANTENNA RANGE COLOR WHIP LENGTH 20 512 000 537 500 Black 4 98 21 537 600 563 100 Brown 4 74 22 563 200 588 700 Red 4 48 23 588...

Page 15: ...AUDIO 2 Receiver output is disconnected cable is defective MODULATION or mis wired 3 Sound system or recorder input is turned down DISTORTED SOUND 1 Transmitter gain audio level is far too high Check...

Page 16: ...UM400a LECTROSONICS INC 16...

Page 17: ...control Modulation indicators Dual bicolor LEDs indicate modulation of 20 10 0 10 dB referenced to full modulation Low frequency roll off 18 dB octave 35Hz to 150Hz Audio frequency response overall sy...

Page 18: ...rs Returning Units for Repair For timely service please follow the steps below A DO NOT return equipment to the factory for repair without first contacting us by email or by phone We need to know the...

Page 19: ...Frequency Synthesized UHF Belt Pack Transmitter Rio Rancho NM 19...

Page 20: ...Lectrosonics Inc will pay for the cost of returning your equipment to you This warranty applies only to items returned to Lectrosonics Inc or an authorized dealer shipping costs prepaid within one yea...

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