UHF Transmitter 5-pin Input Jack Wiring

The wiring diagrams included in this section represent the basic wiring necessary for the most common types of microphones and other audio inputs. Some microphones may require extra jumpers or a slight variation on the diagrams shown.

It is virtually impossible to keep completely up to date on changes that other manufacturers make to their products, thus you may encounter a microphone that differs from these instructions. If this occurs please call our toll-free number listed under Service and Repair page.

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Audio input jack wiring:

  • PIN 1 - Shield (ground)
  • PIN 2 - Bias voltage source for positive biased electret lavaliere microphones in special circuits..
  • PIN 3 - Provides Servo Bias for two-wire electrets. Low impedance microphone level input for dynamic microphones.
  • PIN 4 - Bias voltage selector for Pin 3. Pin 3 voltage (0, 2 or 4 volts) depends on Pin 4 connection.
    - Pin 4 tied to Pin 1: 0 V
    - Pin 4 Open: 2 V
    - Pin 4 to Pin 2: 4 V
  • PIN 5 - High impedance, line level input for tape decks, mixer outputs, musical instruments, etc

SMKIT5P layout

Installing the Connector:

  1. If necessary, remove old connector from microphone cable.

  2. Slide Rubber Boot onto microphone cable with the large end facing away from the microphone. (See illustration above.)

  3. If necessary, slide the 1/8-inch black shrink tubing onto the microphone cable. (This tubing is needed for some cables to ensure the cable fits snugly in the rubber boot.)

  4. Use the resistors and connector included with this kit to configure the TA5F to your particular microphone. (See Wiring Diagrams below.)  A length of .065 OD clear tubing is included if insulating the resistor leads or shield wire is necessary. (Remove rubber strain relief from connector backshell by pulling it out of the backshell.)

  5. Slide the Strain Relief over the TA5F Insert and crimp as shown to the right. Then insert the TA5F Insert and Strain Relief in the TA5F Latchlock. Screw the TA5F Flex Relief onto the TA5F Latchlock.

  6. If needed, position and shrink the 1/8-inch shrink tubing on the microphone cable, then slide the Rubber Boot down over the TA5F connector.

Microphone Cable Termination For Non-Lectrosonics Microphones

TA5F Connector Assembly

TA5F Connector Assembly

 

Mic Cord Stripping Instructions

Mic Cord Stripping Instructions

 

Crimping to Shield And Insulation

Crimping To Shield

NOTE: This termination is intended for UHF transmitters only. VHF transmitters with 5-pin jacks require a different termination. Lectrosonics lavaliere microphones are terminated for compatibility with VHF and UHF transmitters, which is different than what is shown here.

 

Strip and position the cable so that the clamp can be crimped to contact both the mic cable shield and the insulation. The shield contact reduces noise with some microphones and the insulation clamp increases ruggedness.

Wiring Hookups For Different Sources

In addition to the microphone and line level wiring hookups illustrated below, Lectrosonics makes a number of cables and adapters for other situations such as connecting musical instruments (guitars, bass guitars, etc.) to the transmitter. Visit www.lectrosonics.com and click on Accessories, or download the master catalog. A lot of information regarding microphone wiring is also available in the FAQ section of the web site at: Click here for Wireless FAQ

Follow the instructions to search by model number or other search options.

Compatible Wiring for Both Servo Bias Inputs and Earlier Transmitters:

Wiring diagrams11fig

Click here to view/download fullsize jpg of wiring diagrams above 

Microphone RF Bypassing

When used on a wireless transmitter, the microphone element is in the proximity of the RF coming from the transmitter. The nature of electret microphones makes them sensitive to RF, which can cause problems with the microphone/transmitter compatibility. If the electret microphone is not designed properly for use with wireless transmitters, it may be necessary to install a chip capacitor in the mic capsule or connector to block the RF from entering the electret capsule.

Some mics require RF protection to keep the radio signal from affecting the capsule, even though the transmitter input circuitry is already RF bypassed (see 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 RF bypass capacitors at the mic capsule. If this is not possible, or if you are still having problems, capacitors can be installed on the mic pins inside the TA5F connector housing.

RF bypassing

Install the capacitors as follows:  Use 330 pF capacitors. Capacitors are available from Lectrosonics. Please specify the part number for the desired lead style.

  • Leaded capacitors:    P/N 15117
  • Leadless capacitors:    P/N SCC330P

All Lectrosonics lavaliere mics are already bypassed and do not need any additional capacitors installed for proper operation.

 

LineLevels

Line Level Signals

The normal hookup for line level signals is:

  • Signal Hot to pin 5
  • Signal Gnd to pin 1
  • Pin 4 jumped to pin 1

This allows signal levels up to 3V RMS to be applied without limiting.

If more headroom is needed, insert a 20 k resistor in series with pin 5. Put this resistor inside the TA5F connector to minimize noise pickup.