G2 G3 problem (moved from Weddings & Events)

5 replies [Last post]
cameraboy
Offline
Joined: Jun 18 2008

I recently used a Sennheise G2 radio transmitter with a quarter inch jack to XLR for use with a Dynamic Mic that worked OK but when the same lead was used in a G3 unit, with the same Mic, it didn't work any possible reasons why not?

Thanks

John Willett
John Willett's picture
Offline
Joined: Jun 1 2001

Was it a proper Sennheiser lead?

The G2 and G3 are wired very slightly differently.

In both systems the tip is the microphone input and the ring is the line input.

So - the microphone is connected to only the tip and sleeve.

With the G2, the ring can be left unconnected - but with the G3 the ring has to be shorted to the sleeve to make it work.

I suspect the ring is unconnected, which is why the lead worked on the G2 and not on the G3.

Don't forget that there has to be a blocking capacitor in the XLR to prevent the plug-in power that's needed for the tie mics getting to the dynamic mic.

John
 
A picture tells a thousand words, but sound tells a thousand pictures.

cameraboy
Offline
Joined: Jun 18 2008

Thanks for the reply.

No it wasn't a sennheiser lead it was one that was custom made.

Thanks for the insight

Duncan Craig
Offline
Joined: Nov 19 2008

Hello John. It was my lead that Marc was hoping to use. In the end he borrowed my G2 kit as I couldn't figure it out in time for the G3.

Do you know what capacitor is needed, also what pins to put it across in the XLR?

Personally I don't have a capacitor on the G2 lead and it works OK. However there's a DC lift on the G3 for sure though.

Where did you get your info by the way? The manual for this kit is pretty weak in this area.

Cheers, Duncan.

John Willett
John Willett's picture
Offline
Joined: Jun 1 2001
Duncan Craig wrote:
Hello John. It was my lead that Marc was hoping to use. In the end he borrowed my G2 kit as I couldn't figure it out in time for the G3.

Do you know what capacitor is needed, also what pins to put it across in the XLR?

I forget the value - sorry - ring Sam Davison (Service Supervisor) at Sennheiser UK and he will tell you the details. Sennheiser UK's number is 01494-551-551.

Duncan Craig wrote:
Personally I don't have a capacitor on the G2 lead and it works OK. However there's a DC lift on the G3 for sure though.

The capacitor is essential - there is 5V DC coming out of the transmitter to power the supplied electret tie mic. The capacitor blocks this voltage and stops it getting where it shouldn't.

Duncan Craig wrote:
Where did you get your info by the way? The manual for this kit is pretty weak in this area.

Well, I did work for Sennheiser for many years before I went Freelance.

John
 
A picture tells a thousand words, but sound tells a thousand pictures.

Duncan Craig
Offline
Joined: Nov 19 2008

Thanks for the help John.

Marc, give them a call mate!

Regards, Duncan.