XLR cable outputs for 8400M and Heil microphone

ab7i · February 6

Good Morning. I have an 8400M that works fine with the hand mic but I want to use the Heil 781 microphone with the radio. I have confirmed that the microphone works and I have xlr cables that terminate in the proper plug for the mic. I can not get the microphone to work. I know this is a simple task but it is giving me fits. I have the proper setting in the radio and have tried everything. I got the cables from amazon, so maybe that's my problem.

Neil D Friedman N3DF · February 6

My 781 works great with my 6600M, but I use the balanced audio input that does not exist on the 8400M.

David Decoons, wo2x · February 6

Check out custom cables from W2IHY

https://w2ihy.com/product/custom-cable/

Ken Wells · February 8

1) Be sure that the mic cable is a truly balanced XLR to 1/8 inch TRS cable. Many of those sold online are not balanced and are wired to use a XLR Balanced mic on a computer's unbalanced input, or they combine the TIP and RING and send them to the Pin 2 of the XLR plug.

Your cable should be wired like this:

XLR > > > > > TRS

Pin 1 > > > > SLEEVE/GROUND
Pin 2 > > > > TIP
Pin 3 > > > > RING

Here is one that would work:

Amazon.com: CableCreation 3.5mm (1/8 Inch) Stereo Male to XLR Female Cable, 6 Feet/Black : Electronics

2) Please refer to this document for adjusting your mic settings.

Adjusting your Microphone Settings for Best TX Audio – FlexRadio

ab7i · February 9

Thank you Ken, yes I had a trs plug and wired as you pointed out and it works….Thanks so much to the community

XLR cable outputs for 8400M and Heil microphone

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