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Radio audio troubles

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berkut13(at)berkut13.com
Guest

Posted: Wed Feb 14, 2007 8:09 pm Post subject: Radio audio troubles

Hi Gurus,



It's been awhile, but I hope all is well with you all.



I'm having audio issues with my new Becker 4201 #2 com and was wondering if

you could help.



The issue is the output audio from the radio whenever there is another radio

switched into the same output.  As soon as any other input is selected on

the audio panel at the same time, the com#2 volume goes very very low and is

overpowered. Sidetone during transmit seems un-affected as does the audio of

the other sources selected - only the Com2 audio drops down.  By

itself...the radio sounds fine, and operates properly.



The #1 com (iCom A200) works fine and is nice and loud with any number of

inputs selected on the audio panel (KA-134).  Adding additional inputs has

little to no affect on com1 volume.  It works great - as it should.



According to the KA-134 schematics, the only thing it's doing with the phone

outputs from the radios is mechanically switching them (no electronics)

together to a single output line to the intercom.  Because of this, I was

wondering if the impedance differences of the radios are a problem.

However, I have no real understanding of the magic involved here.



They are as follows according to the respective docs:

Com1 iCom - 500 ohms

Com2 Becker - 600 ohms

Eng mon - 560 ohms

Nav KN-53 - 500 ohms

RST Marker Receiver - unknown



I am still puzzled why Com1 has no issues with any number of other inputs,

and

Com2 does....impedance differences and all.



Any ideas?  I have schematics for the KA-134 if you want to see it...but for

this, it's just mechanical switches.



Thanks for any help!



James Redmon

Berkut13 N97TX

- The Matronics Avionics-List Email Forum -

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hiflier68

Joined: 03 Nov 2006
Posts: 1

Posted: Thu Feb 15, 2007 8:16 am Post subject: Radio audio troubles

Hi James,



Mitch Goodrich I have Gary Kirby's old varieze..

I am in Austin for the next few days. Wondering

if we can meet up??  YI'd enjoy spending some time

with you, Gary, and Hopper.

Find me at 813-356-9758



Thanks,



Mitchell

--- berkut13(at)berkut13.com wrote:



 	  Quote: 	
		   

 

 Hi Gurus,

 

 It's been awhile, but I hope all is well with you all.

 

 I'm having audio issues with my new Becker 4201 #2 com and was wondering

 if

 you could help.

 

 The issue is the output audio from the radio whenever there is another

 radio

 switched into the same output.  As soon as any other input is selected

 on

 the audio panel at the same time, the com#2 volume goes very very low

 and is

 overpowered. Sidetone during transmit seems un-affected as does the

 audio of

 the other sources selected - only the Com2 audio drops down.  By

 itself...the radio sounds fine, and operates properly.

 

 The #1 com (iCom A200) works fine and is nice and loud with any number

 of

 inputs selected on the audio panel (KA-134).  Adding additional inputs

 has

 little to no affect on com1 volume.  It works great - as it should.

 

 According to the KA-134 schematics, the only thing it's doing with the

 phone

 outputs from the radios is mechanically switching them (no electronics)

 together to a single output line to the intercom.  Because of this, I

 was

 wondering if the impedance differences of the radios are a problem.

 However, I have no real understanding of the magic involved here.

 

 They are as follows according to the respective docs:

 Com1 iCom - 500 ohms

 Com2 Becker - 600 ohms

 Eng mon - 560 ohms

 Nav KN-53 - 500 ohms

 RST Marker Receiver - unknown

 

 I am still puzzled why Com1 has no issues with any number of other

 inputs,

 and

 Com2 does....impedance differences and all.

 

 Any ideas?  I have schematics for the KA-134 if you want to see it...but

 for

 this, it's just mechanical switches.

 

 Thanks for any help!

 

 James Redmon

 Berkut13 N97TX

- The Matronics Avionics-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Avionics-List

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