CN acoustic FLARM warning to radio AUX input?

[Chris Hostettler]

I am using the latest CN software with acoustic FLARM warnings in combination with PowerFLARM brick.
Everything works fine except that the spoken warning can hardly be heard.
Is there a way to feed the acoustic signal from CN to the AUX input of the radio?

[Evan Ludeman / T8]

There's a fix in the works to improve the audio.  The main problem is the speaker. 

The audio can be intercepted at pins 5&6 on the 15 pin green connector to the nexus box.  The wires are white/red and white/black.  That signal at full strength will probably overload an aux input, but could be brought into line with a simple resistance divider (I think).  Or, just take the existing signal and use a better external speaker.

Btw: the volume control for the alert audio is found under 'airspace'.  Even at max volume, you may still find it a little marginal, depending on how you have your nexus box mounted.

[Chris Hostettler]

what's the impedance of the speaker?
I will hook a pot in to adjust it to the AUX radio input.

[Evan Ludeman / T8]

We have an accessory speaker kit more or less ready to ship.  Reviewing install instructions now.  Should have a part number and price very shortly.  I'm looking forward to getting this in my glider!

[Evan Ludeman / T8]

what's the impedance of the speaker?
I will hook a pot in to adjust it to the AUX radio input.

That probably isn't going to work very well.  The schematic attached hasn't been tested, but should work.  You can find a 600 ohm audio transformer on ebay for under $5.  Tim reports that our newly available external speaker works very well for flarm alerts.  I'll have one in my glider shortly.  http://clearnav.net/simplemachinesforum/index.php?topic=209.0

[Chris Hostettler]

Thank you.
I will go for the speaker option, but I would like to use my second speaker in the ASW27 which has 8 Ohm impedance. Is this the compatible with the shown Uniden speaker.
best greetings
Chris Hostettler

[Evan Ludeman / T8]

CN speaker is 8 ohms.  As stated in other thread, do not connect more than one audio source to a speaker.

[Chris Hostettler]

I know - that's common sense 

[Evan Ludeman / T8]

One of the things I have learned doing customer support is that it's almost never wasted breath to state the "obvious".

[Chris Hostettler]

very true Evan
 

[pavel621]

 I have this UNIDEN BC-7 speaker which I ordered new together with CN II and CNv. After about 60 hours of use I lost all GPS signals (CN II,CNv,PowerFlarm) during flight. After landing I heard that speaker is strangely loudly chirping. When I disconnected speaker my all instruments started to work just like before. Are those wires on UNIDEN BC-7 from ClearNav shielded with aviation approved material to avoid interference?  Exactly same  UNIDEN BC-7 speaker is for half a  price in my Walmart. I assume ClearNav is upgrading wires to aviation specification. Please confirm. Thank you. Pavel Skrabal

[Evan Ludeman / T8]

If you think you have hardware problems, please call ClearNav Instruments.  Gary is our service guy.

I don't have any reason to suspect that your GPS issue was caused by the speaker.  Speaker wires (audio frequency) are -- to my knowledge -- not ordinarily shielded.

Just to confirm, the Uniden speaker is for use on CN2 *only*, it cannot be shared between CNv + CN2. 

[pavel621]

I am ordering new speaker from ClearNav. Everything was just fine for first 60 hours and then speaker started making loud noises all of sudden. I disconnected speaker and everything is working very well again. I have my panel re-done by professional  and I hope moving speaker from shelf into the fuselage behind my head will solve future problems like this.I know I can call Gary but I think ClearNav users on this forum can find any issue interesting and helpful. I found myself lot of answers over here without calling Gary. Thank you.Pavel Skrabal