6400 Mic connector wiring

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I can't seem to find a wiring diagram for the Mic connector on the 6400. The text in the hardware manual states that for an electret mic that bias is applied to the (+) terminal. Is the (+) terminal the tip? A typical PC mic connector is wired with bias to the ring, of an 1/8" TRS, and the mic audio output is available on the tip.

So, if I plug an electret mic with that configuration into the mic jack on the 6400 will that work? Or do I have to build an adapter?

Unless I've missed something, there is nowhere I have found that explains this clearly.

Thanks,
Geoff 
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Geoff - AB6BT

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Posted 4 months ago

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Jay / NO5J

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Geoff
The current FLEX-6400/FLEX-6600 Hardware Reference Manual on pages 27-29 shows the correct 
pinout.

http://www.flexradio.com/downloads/flex-6400-and-flex-6600-hardware-reference-manual-pdf/# 

The Bias voltage will be on the Tip, when it's enabled.  

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Geoff - AB6BT

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OK, I see that, thanks for pointing it out. Somehow I missed that.

So, just to confirm, that means that a normally configured PC mic, with bias on the ring and audio on the tip, will not work.
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Jay / NO5J

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Geoff

Correct, I think a homebrewed adapter would be possible though. 

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Geoff - AB6BT

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Right. I've got all the pieces so I'll build one. I just think it odd that Flex would use a non-standard configuration. I'm sure there was a reason behind the decision.

Thanks for your help.

73, Geoff
AB6BT
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Wayne

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Cheap, Cheap, Cheap! Plus they can charge $40 for adapter cables.
(Edited)
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Geoff - AB6BT

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I don't see how the wiring configuration would change the cost in any way.

And if people are unable to fab their own adapters then I think it is entirely reasonable to charge for T&M just like any other product.
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Clay N9IO

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Totally agree Geoff.
Many configs possible via the correct adapter.