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XM audio input

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Jeckenroth(at)NBN.NET
Guest

Posted: Wed Oct 24, 2007 8:35 am Post subject: XM audio input

I have a Terk Commander XM installed in my RV9A with the audio into the 

unswitched music input of the audio panel (PMA 8000).  The Terk Commander 

does not have a volume control as it is intended to be run through the car 

radio and utilize the volume control in the radio.  I can control the volume 

by adjusting the individual controls on the headsets but this is not ideal. 

I would like a method of adjusting the volume between the XM output and the 

audio panel input.  I am sure that I am not the first to confront this 

problem.  When responding please keep in mind that I can follow instructions 

but I am not electronically gifted.



Paul Eckenroth

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rjquillin

Joined: 13 May 2007
Posts: 123
Location: KSEE

Posted: Wed Oct 24, 2007 12:17 pm Post subject: XM audio input

A dual ~1K pot seems like a simple solution.

Outputs from the Terk to the top, CW, end of the pots, wipers to the 

PMA inputs and pot CCW ends to common.

A "volume" control.

Use a log, audio, taper pot.



Ron Q.

At 08:35 10/24/2007, you wrote:

 	  Quote: 	
		  

<Jeckenroth(at)NBN.NET>



I have a Terk Commander XM installed in my RV9A with the audio into 

the unswitched music input of the audio panel (PMA 8000).  The Terk 

Commander does not have a volume control as it is intended to be run 

through the car radio and utilize the volume control in the 

radio.  I can control the volume by adjusting the individual 

controls on the headsets but this is not ideal. I would like a 

method of adjusting the volume between the XM output and the audio 

panel input.  I am sure that I am not the first to confront this 

problem.  When responding please keep in mind that I can follow 

instructions but I am not electronically gifted.



Paul Eckenroth

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jon(at)finleyweb.net
Guest

Posted: Fri Oct 26, 2007 1:29 pm Post subject: XM audio input

It sounds as though I'm in the same boat as Paul.



I think I almost understood your response Ron.  Could you (or someone)

elaborate just a bit more??



Thanks,



Jon

DO NOT ARCHIVE



--

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rjquillin

Joined: 13 May 2007
Posts: 123
Location: KSEE

Posted: Fri Oct 26, 2007 2:13 pm Post subject: XM audio input

At 14:26 10/26/2007, you wrote:

 	  Quote: 	
		  It sounds as though I'm in the same boat as Paul.



I think I almost understood your response Ron.  Could you (or someone)

elaborate just a bit more??



Thanks,



Jon


	


My proposed solution made at least two assumptions:

1) the output from the external XM radio provides more than adequate 

signal amplitude; plenty loud.

2) you have no issues affecting audio quality; ground loops, 

impedance mismatch, stereo/mono issues.

One only needs to interrupt the existing signal connection from the 

radio to the audio panel and insert a variable attenuator; aka volume 

control.  The catch, it only makes the signal softer; no gain.



The output from the external receiver is connected between the CW 

(high) and CCW (common) terminals of the 'volume control'.  The input 

to the audio panel is connected between the center (wiper) terminal 

and the CCW common terminal.  Two, or dual, section control; one for 

left and one for right channels.

Most any acceptable (to the user) control between a minimum of say 1k 

up to around 10k with a log (audio) taper should be fine.

As always watch lead dress and strain relief for cables.



Ron Q.

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jon(at)finleyweb.net
Guest

Posted: Fri Oct 26, 2007 4:18 pm Post subject: XM audio input

Thanks Ron.  I think I'm with you now! 



Jon



do not archive



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