impedance???

[ffemtbland]

Hey folks - I am working on a project to use a motorola HMN1035C mic (standard mobile type) with my yaesu handheld. I need to do some impedance matching, I think. My Yaesu manaul says the mic is 2 kOhm impedance. What is the impedance on the Motorola mic, and how do I match the two??
Lars

 

[cristisphoto]

Try Emailing
http://www.mfjenterprises.com/index.php

They should know or know whom would maybe knoiw LOL

Good luck
Crista

 

[greenthumb]

You will need a transformer to match the two. I'm not sure what the impedance of a Motorola microphone is, but you'll want the transformer that will multiply or divide the matching impedance so that the two impedances come close together.

I would bet, however, that they'll be pretty close as-is...but I could be wrong.

 

[jim202]

Most of the Motorola mics require a DC bias voltage to make them work. No bias,
no audio coming from the mic.

You might want to check this out before you get too wound up on using the
Motorola mic.

 

[obijohn]

Hey folks - I am working on a project to use a motorola HMN1035C mic (standard mobile type) with my yaesu handheld. I need to do some impedance matching, I think. My Yaesu manaul says the mic is 2 kOhm impedance. What is the impedance on the Motorola mic, and how do I match the two??
Lars

The Moto Microphone and the Yaesu microphone both use electret condenser microphone elements. Maybe you can google the moto microphone and find out what the pinout of the RJ45 plug is. I am pretty sure that impedence will not be an issue.

 

[zz0468]

The Motorola mic element was originally designed to act like a carbon mic element in a telephone handset. Now, that's going back a ways, but I've had occasion to need to graft a microphone onto a phone or microwave mux circuit, and the Motorola mic just worked. It's around 600 ohms, but the previous advice that it needs dc bias is absolutely correct. The mike audio line ends up with both dc bias and audio. I doubt the Yaesu handheld is up to the task without some help.

Btw, I'm baffled as to why MFJ would know the answer to this one.