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Headset Wiring  
User currently offlineTimT From United States of America, joined Jun 2001, 168 posts, RR: 0
Posted (13 years 11 months 1 week 3 days 9 hours ago) and read 11580 times:

Here's a tech question- I have both a David Clark headset and a Telex. The Clark set has a single plug for ground/cockpit communications. Does anyone have a wiring diagram to rewire for a double (mic/sound) plug? The Telex already has the 2 plug setup..


3 replies: All unread, jump to last
User currently offlineSccutler From United States of America, joined Jan 2000, 6063 posts, RR: 26
Reply 1, posted (13 years 11 months 1 week 3 days 5 hours ago) and read 11563 times:

Your DC is a helicopter set-up; you can purchase adapters for the same purpose, IIRC.

...three miles from BRONS, clear for the ILS one five approach...
User currently offlineAirplay From , joined Dec 1969, posts, RR:
Reply 2, posted (13 years 11 months 1 week 3 days 3 hours ago) and read 11556 times:

Your DC headset very likely has a "straight" dynamic microphone that is typical for helicopter and military applications. Your telex very likely has an "amplified" dyamic microphone that is typical for fixed wing civilian applications.

These two microphones are not compatible. The amplified dynamic unit requires a bias voltage to operate. The straight dynamic unit does not. If you use a simple plug adapter you will destroy the David Clark microphone the first time you transmit.

There is a chance that your DC set has been fitted with an amplified dynamic unit. Check the microphone before trying an adapter.

User currently offlineVictech From United States of America, joined Jun 2000, 546 posts, RR: 2
Reply 3, posted (13 years 11 months 1 week 3 days 3 hours ago) and read 11552 times:

As a SR* geek, the correct term for "amplified" dynamic microphone is "condenser mic"...in the SR world, condensers operate on a +48V "phantom power" sent across the XLR connector that serves as the bias voltage for the pickup ceramics inside.

And, yes, Airplay, odds are that the DC unit has a dynamic microphone and not a condenser.

*SR-Sound Reinforcement

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