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No sidetone driving me insane!

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keithmckinley

Joined: 11 Aug 2008
Posts: 434

Posted: Fri Aug 15, 2008 6:08 am Post subject: No sidetone driving me insane!

Hi, 



I've got an Icom a200 radio connected through a pm 1200 intercom. 



When I got the plane it had no side tone at all. Pulled the radio and tried to adjust the sidetone pot to no avail. Turned off intercom and still no side tone. 



I've tried numerous different headsets. I did notice what seems to be a disconnected wire(s) at the molex connector but don't no if that's an issue. The wiring job is shoddy to begin with but I'd hate to rip it out and start new if it's actually a radio issue. 



radio transmits and receives just fine and the intercom is awesome at canceling out noise in my very loud warbird. 



Just hoping for some last chance advice before I send the radio out for a bench test. 



Thanks, 



Keith

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nuckolls.bob(at)cox.net
Guest

Posted: Fri Aug 15, 2008 4:44 pm Post subject: No sidetone driving me insane!

At 07:08 AM 8/15/2008 -0700, you wrote:

 	  Quote: 	
		  

<keith.mckinley(at)townisp.com>



Hi,



I've got an Icom a200 radio connected through a pm 1200 intercom.



When I got the plane it had no side tone at all. Pulled the radio and 

tried to adjust the sidetone pot to no avail. Turned off intercom and 

still no side tone.



I've tried numerous different headsets. I did notice what seems to be a 

disconnected wire(s) at the molex connector but don't no if that's an 

issue. The wiring job is shoddy to begin with but I'd hate to rip it out 

and start new if it's actually a radio issue.



radio transmits and receives just fine and the intercom is awesome at 

canceling out noise in my very loud warbird.



Just hoping for some last chance advice before I send the radio out for a 

bench test.


	


   Sidetone is not subject to variations in headsets.

   If you can hear anything else in the headsets and

   no sidetone, then it's not the headsets.



   I looked at the installation manual and didn't spot

   any mention of sidetone . . . are you sure this

   radio supports it?



   Bob . . .

        ----------------------------------------)

        ( . . .  a long habit of not thinking   )

        ( a thing wrong, gives it a superficial )

        ( appearance of being right . . .       )

        (                                       )

        (                  -Thomas Paine 1776-  )

        ----------------------------------------

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rampil

Joined: 04 May 2007
Posts: 870

Posted: Sat Aug 16, 2008 5:54 am Post subject: Re: No sidetone driving me insane!

Assuming that the hardware supports sidetone(and I think all intercoms

do), then lessee:



shoddy amateur wiring with obvious failed connectors vs. solid state

radio.....



In all of aircraft, it's not what you want to do, you do what needs to

be done.



Take your time, get it right, and if you can't replace the crappy

molex connectors, at least solder them after crimping

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_________________
Ira N224XS

keithmckinley

Joined: 11 Aug 2008
Posts: 434

Posted: Sat Aug 16, 2008 6:32 am Post subject: Re: No sidetone driving me insane!

sidetone is supported by intercom and radio.



I think I'll pull the radio for a bench test....had enough



Keith

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Bruce(at)glasair.org
Guest

Posted: Sat Aug 16, 2008 6:58 am Post subject: No sidetone driving me insane!

A good crimp with the proper tool is just as good as a solder joint. Now

when you solder a crimped joint you create a single stress joint at the

solder point. Unless you provide some stress/flex relief (shrink wrap tube),

you're asking for trouble down the road.



Bruce

www.Glasair.org

 

--

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jgarner(at)dslextreme.com
Guest

Posted: Sat Aug 16, 2008 8:03 am Post subject: No sidetone driving me insane!

One thing you might check is where the headset is

wired to.  Most radios have a headset AND a

speaker output, they are not the same.  Speaker is

muted with transmit and headset has sidetone.

This bit me when I installed a SL30!  Still have

to go under the panel and move that pin...



HTH, Joe

keithmckinley wrote:

 	  Quote: 	
		   

 "keithmckinley" <keith.mckinley(at)townisp.com>

 

 Hi,

 

 I've got an Icom a200 radio connected through a

 pm 1200 intercom.

 

 When I got the plane it had no side tone at

 all. Pulled the radio and tried to adjust the

 sidetone pot to no avail. Turned off intercom

 and still no side tone.

 

 I've tried numerous different headsets. I did

 notice what seems to be a disconnected wire(s)

 at the molex connector but don't no if that's

 an issue. The wiring job is shoddy to begin

 with but I'd hate to rip it out and start new

 if it's actually a radio issue.

 

 radio transmits and receives just fine and the

 intercom is awesome at canceling out noise in

 my very loud warbird.

 

 Just hoping for some last chance advice before

 I send the radio out for a bench test.

 

 Thanks,

 

 Keith

 

 -------- Wizard

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keithmckinley

Joined: 11 Aug 2008
Posts: 434

Posted: Sat Aug 23, 2008 6:05 am Post subject: Re: No sidetone driving me insane!

THANK YOU JOE GARNER!



You were absolutely right. The person who wired this system used the speaker out terminal to the headsets instead of the headset jack out.



Problem solved, life is good!



Next beers are on me!



Keith

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