[NLRS] help!!!! TR-9130 microphone

[Chris Cox, N0UK]

John,

it is just possible that the TR-9130 uses a dynamic microphone and the  
8-pin mic's you're trying to use have electret elements which require  
a DC bias to function.

On Sep 10, 2008, at 9:27 PM, John Hoaglun wrote:

>
>
> I am testing out my TR-9130 so that I can replace my TR-751 which  
> currently
> is a little hearing impaired.
>
> The TR-9130 has a 6 pin microphone connector and the TR-751 has an 8  
> pin
> connector. I bought an adapter to bridge that gap. The PTT is  
> working but I
> am not getting any mic audio. I checked the pin out and it appears  
> to be
> correct and pass the test with my VOM. I get FM carrier and CW but  
> no mic
> audio. I tried using 2 different Kenwood 8 pin mics that work.
>
> Is there some magic to the mic that I am missing?
>
> The 6 pin side is Mic, PTT, and GND
> The 8 pin side is Mic, Mic-GND, PTT, PTT-GND
>
> Mic-GND and PTT-GND share a common connection to GND.
>
> I was hoping to use the TR-9130 for this weekend's contest but that  
> is not
> looking too promising right now unless I want to make 902/1296 CW  
> only. If I
> am going to use the TR-9130 I will need to adjust the drive levels  
> in the
> transverters because the 9130 is a lower output than the 9310. It is  
> not a
> big tune-up but it does take a little bit off time.
>
> The sensitivity of the 9130 is much better than my current IF rig so I
> really would like to make the swap if I can figure out this mic  
> audio issue.
>
> I am looking from some guidance from the group that might be  
> familiar with
> my issue.
>
> Thanks, JH
> -----------------------------
> John Hoaglun
> NG0R - EN25
> http://www.hoaglun.com
>
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Chris Cox, N0UK  -  chrisc at chris.org
           chrisc at britishcaranddriver.com