LX9000 Audio Out to Trig TY91

[Steven Nevels]

Trying to use the Aux In feature on the Trig TY91 to eliminate having a dedicated speaker for the LX9000

The audio input on the TY91  works with an MP3 player and the sound is very clear. 

When I connect it to the audio out on the V80 vario it is very static filled and difficult to hear. 

Any Ideas why this input would work with an MP3 player but not with the LX9000? 

Any ideas on what can be tried to make this work?

Has anyone successfully set up their LX9000 to use the Aux in of a TY91?

[David S]

First, one problem with your idea:  wouldn't the vario audio go away whenever someone talks on the radio?  I would hate to be working on a low save while some chatterbox is keeping the radio busy.

As for the problem, while my knowledge in this area is worthy of your skepticism, I would say that the audio signal from the LX is simply too big.  It is trying to drive a speaker.  The output is likely 10V or so.  The Trig audio input wants a much weaker signal.  These so-called line-level inputs want something like 0.5V to 2V.  The Trig winds up clipping the stronger signal.  That produces the distortion you describe as static. 

You can solve this by using an audio cable with an in-line attenuator that reduces the voltages.  

So, why does the MP3 work just fine?  The headphone jack on an MP3 player can output either a strong signal to drive a speaker or a weaker signal to be used as the audio input for another device.  It senses the load connected to the headphone jack and changes its output appropriately.  But there's no reason for the LX to do this.  I expect it always outputs a strong signal.

In looking for an attenuator, a product like this is the right idea, but this one might be too much attenuation.  It is 60dB and you might only need 20dB.

https://www.ebay.com/itm/286509212166?chn=ps&mkevt=1&mkcid=28&google_free_listing_action=view_item

Here's a 25db version

https://www.bhphotovideo.com/c/product/746645-REG/Sescom_LN2MIC_ZOOMH4N_LN2MIC_ZOOMH4N_Line_to.html

Now, that one is intended to connect a line-level signal to a microphone input (which is even lower).  But so far as I know, 25db is 25db, so it should work in your application.  But while I can't think of a reason why a microphone attenuator would be different in any consequential way, I'm really getting out of my league at this point, so please seek better advice before making a purchase.

Lastly, there are also cords with adjustable attenuation, but I have not found one that specifies its attenuation range.

https://www.amazon.com/dp/B08T1YW1JK?th=1

Cheers,

   ...david

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[Steven Nevels]

I appreciate your help David, I'll give that a try and let you know. as far as the audio being clipped during radio reception the TY91 has an option to mute or not mute the Aux audio during radio reception.