Skip to content

ref_com.md

Latest commit

 

History

History
88 lines (74 loc) · 3.67 KB

ref_com.md

File metadata and controls

88 lines (74 loc) · 3.67 KB

Com - Reference Notes

Checking Termination

  1. using a multimeter, measure the resistance between pins #1 and #3 on one of the channel A XLR connectors
  2. If the channel is terminated properly, then the resistance should measure approx. 4k ohms
    • a very high resistance indicates no termination
    • a resistance of 2K ohms indicates a double termination
  3. repeat for other channels
  4. check resistance between chassis ground and pin #1. Using an ohmmeter, measure the resistance from pin #1 on the mainstation or power supply to chassis ground.
    • the measurement should read 10 ohms
    • a high reading (over 100 ohms) indicates the 10 ohm resistor in the unit has failed and needs repalcement
      • failure to replace a failed resistor results in an audible buzz in the system
    • a reading of less than 10 ohms (or a short) typically indicates that the shell and pin #1 of the cable are shorte together

Mic Gain Controls

The following beltpacks have individual control over mic gain:

  • RS-602
    1. press and hold setup button until "P" is displayed
    2. press the A call button repeatedly I told the display shows "A"
    3. the A volume knob can be used to set the gain of the mic, with clockwise being louder and counterclockwise being quieter
    4. press the setup button again to save the settings to the beltpacks

Tempest 2400 Basestation

  • General troubleshooting
    • Take the whole tempest system, put it in a box, and throw it in the trash...
    • Wireless cutting in and out on a wired com channel can indicate a need to null the wireless basestation

Clear-Com SB-704

  • 10 channels on the back are self terminating
  • channels 1-5 and 6-10 share a power rail, respectively. If you have an external PSU plugged into any channel in one of those ranges, the whole range of channels gets extra juice

Repair Info

  • MS-440
    • Talk button bulb: 5v 30mA radial bi-pin

Recording Com

Freespeak II

You can record com channels off the basestations 4-wire ports with an RJ45 to XLR adapter.

Getting Line Level audio in/out of 4-wire com

RJ45 pin RJ45 color XLR pin
pin 3 green-striped pin 2 (socket)
pin 4 blue pin 2 (plug)
pin 5 blue-striped pin 3 (plug)
pin 6 green pin 3 (socket)

RS-601

The auxillary headphone connector on an RS-601 can be used to record the audio off the com channel the beltpack is connected to. you'll need:

the left channel of the 3.5mm to dual XLR adapter will have the earpiece audio signal on it

Clear-Com Pinouts

2-Wire

pin purpose
pin 1 ground
pin 2 DC power (30V)
pin 3 duplex audio

4-Wire

pin to panel to matrix
pin 1 RS-422 input + (into matrix) RS-422 output + (from panel)
pin 2 RS-422 input - (into matrix) RS-422 input + (from panel)
pin 3 audio input + (into matrix) audio output + (from panel)
pin 4 audio output + (from matrix) audio input + (into panel)
pin 5 audio outout - (from matrix) audio input - (into panel)
pin 6 audio input - (into matrix) audio output - (from panel)
pin 7 RS-422 output + (from matrix) RS-422 input + (into panel)
pin 8 RS-422 output - (from matrix) RS-422 input - (into panel)

GPIO DB-9

pin purpose
pin 1 line out (mic out) +
pin 2 line in +
pin 3 ground
pin 4 relay (GPO), normally closed
pin 5 relay (GPO), normally open
pin 6 line out (mic out) -
pin 7 line in -
pin 8 GPPI (short GPI pin to ground to activate)
pin 9 relay (GPO) common (relay wiper)