Selex LEMO to Peltor adapter

Parts

• LEMO FGG.1B.305.CLAD62
• NEXUS TJ-101
• Cable with 4 conductors. Suitable overall cable diameter is 4,7-5,3mm
  • https://partco.fi/tuote/datakaapeli-suojavaipalla-4x-0-25mm2-7349
• Original Selex PRR headset wire colors are:
  • Green Mic+
  • Yellow Speaker+
  • Blue Speaker-/GND
  • White Mic-/GND

Selex PRR LEMO to Peltor J11

Lemo pinout.The connections given are defined as 'when looking into the sockets'.[1]

LEMO

1. Microphone+ / Green
2. N/A
3. Speaker + / Yellow
4. GND / Brown (blue) (sprk)
5. GND / White (mic)

*Numbering clockwise from the back of the connector

JT-101 techincal documentation [2]

NEXUS TJ-101

Civil / Peltor wiring

1. Microphone GND / White
2. Microphone + / Green
3. Speaker + / Yellow
4. Speaker GND / Brown (blue)

Nato wiring

1. Microphone GND / White
2. Speaker + / Yellow
3. Microphone + / Green
4. Speaker GND / Brown (blue)

Suitable microphones

With dynamic microphone you must use dynamic to electrec microphone adapter circuit. Quick googleing finds that Peltor MT7, MT73 and MT14 microphones needs the adapter board. Peltor MT53 should be electrec microphone by default and should not need the adapter board. (Not tested)

Tested with Peltor MT7 microphone.

• 

  Dynamic microphone to electret microphone input circuit [3]

  Partlist
  • R1 100 kΩ Resistor / 200-500 kΩ trimmeripotentiometri
  • C1 10µF Capasitator / MLCC size 0805 or 1206
  • Q1 BC547B Transistor / SOT-23 SMD

References

1. [1] https://www.cryptomuseum.com/radio/selex/prr/index.htm
2. [2] https://eu.mouser.com/datasheet/3/59/2/tj_101.pdf
3. [3] https://www.transkommunikation.ch/dateien/schaltungen/diverse_schaltungen/audio_circuits/Dynamic%20microphone%20to%20electret%20microphone%20input.pdf