[Milsurplus] T-368 Carbon Microphone Question(s)

[WA5CAB at cs.com]

Ron,

This is for the benefit of milsurplus list members.  

What needs to be done is to accomplish MWO 11-5820-258-35/3 (copy sent to 
you) which consists of moving the wire on J11 terminal D to terminal E and, 
if you had requisitioned the MWO kit, drill two holes and attach a plate with 
the MWO number on it.  In lieu of that, just neatly print the MWO number 
above the connector.

Robert Downs - Houston
wa5cab dot com (Web Store)
MVPA 9480

In a message dated 01/28/2017 12:13:42 PM Central Standard Time, 
Ron.K3PID at sbcglobal.net writes: 
> My Carbon Microphone (M-29B/U) is always in line. That is even when the 
> T3 is not keyed either by the “Continuous” keying switch or by the push 
> button on the mic.  
>  
>  J11 on the T3 seems to be wired per print but I can not find wiring for 
> the inside of the mic.  The switch in the mic is a DPST with one contact 
> used to key the xmtr ( that works fine) and the other contact is fed from the 
> carbon mic element and switches it to pin E on J11 which shows No 
> Connection on the print and indeed has nothing connected in the xmtr. I have prints 
> for basic thru series E Modulator decks and none show a connection to 
> J11/E. Is there a mod that I am missing?
> 
>   
>  More info --- I found MIL-DTL-11193E ( the detailed specifications for 
> the M-29B/U carbon microphone set. It has full details of the mic wiring and 
> my mic is wired per print. The problem is that in order for the mic feed to 
> be switched with the DPST push to talk button, something has to be 
> connected to PIN E of J11 in the T3! Either the line running to the gain pot R16 
> or the bia supply both of which are currently connected to PIN C of J11 and 
> therefor not switched....  
>  
>  CAN YOU TELL ME if the mic element is normally hot all the time as 
> indicated by the print or does it get switched by the PTT button on YOUR T3?
>   
>  Still confused ( normal state...)
>  Ron K3PID
>   
> 
> 
> 
> 
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