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

[John Hoaglun]

N0DQS and N0UK hit it right on the head.  Pin 5 - Pin 5 for 8vdc for
microphone was missing. What is interesting is that the TR-9130 manual and
schematics don't show that pin 5 has any internal connection. It appears
that the manual and circuit don't match.

Next issue:

TR-751
FM 10 watts
SSB 8 watts
CW 10 watts

TR-9130 (on low power)
FM 4 watts
SSB 10 watts
CW 4 watts


So do I turn down the mic gain (to level out the power output) and then
adjust the transverters to the lower drive level of the TR-9130?

Leave the SSB/mic level as-is and back off the mic a bit and then adjust the
the transverters to the lower drive level of the TR-9130?

I think that option one is the proper path. I need to make my decision today
so that I can try to realign the transverters (which are in my utility
room... not in my shack/office) tonight. Then I will need to get an on-air
check Thursday or Friday evening.

(I am assuming that there is a trimmer pot in the DEMI transverters that
acts as a pad for the drive levels.)

Thanks, JH


-----------------------------
John Hoaglun
NG0R - EN25
http://www.hoaglun.com

-----Original Message-----
From: Chris Cox, N0UK [mailto:chrisc at chris.org] 
Sent: Wednesday, September 10, 2008 10:07 PM
To: john at hoaglun.com
Cc: nlrs at mailman.qth.net
Subject: Re: [NLRS] help!!!! TR-9130 microphone

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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> NLRS at mailman.qth.net
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Chris Cox, N0UK  -  chrisc at chris.org
           chrisc at britishcaranddriver.com