Flyin Bullfrog Posted October 12, 2017 Report Posted October 12, 2017 Have developed a piercing squeal when pressing the PTT. Using new upgrade Zulu3 headset via a GTN 650. New batteries. Squelch adjust has no effect on the piercing squeal. Pls help-would really like to use the noise redux of the Z3. Going to call Lightspeed, but think the issue is in the plane, 79 Mooney 231. Any advise/help would be appreciated. Tks! Quote
ArtVandelay Posted October 12, 2017 Report Posted October 12, 2017 Have developed a piercing squeal when pressing the PTT. Using new upgrade Zulu3 headset via a GTN 650. New batteries. Squelch adjust has no effect on the piercing squeal. Pls help-would really like to use the noise redux of the Z3. Going to call Lightspeed, but think the issue is in the plane, 79 Mooney 231. Any advise/help would be appreciated. Tks! Did you try the copilot side? Quote
Flyin Bullfrog Posted October 12, 2017 Author Report Posted October 12, 2017 I have not-good call. Tks Quote
mooniac15u Posted October 12, 2017 Report Posted October 12, 2017 39 minutes ago, Flyin Bullfrog said: Have developed a piercing squeal when pressing the PTT. Using new upgrade Zulu3 headset via a GTN 650. New batteries. Squelch adjust has no effect on the piercing squeal. Pls help-would really like to use the noise redux of the Z3. Going to call Lightspeed, but think the issue is in the plane, 79 Mooney 231. Any advise/help would be appreciated. Tks! Is there any chance you are getting feedback through your second comm radio? If have my audio panel switched to monitor comm 2 while transmitting on comm 1 and the frequencies on the two radios are close I sometimes get some feedback. You might want to try turning off comm 2 completely and see if that has any impact. 1 Quote
Flyin Bullfrog Posted October 12, 2017 Author Report Posted October 12, 2017 Lightspeed folks tend to think it's a Mic gain issue. Just need a jewelry flat head screw driver. Take off Mic muff and gain screw resides under a small plastic cover. Seems sailor proof: Clockwise increases gain counter clockwise reduces gain. LS says to back off .25 turn to begin with. Appreciate all the other tips. Will report the fix once the gremlin is cornered and exterminated. Rico N231C Quote
Piloto Posted October 12, 2017 Report Posted October 12, 2017 Try turning off the ANR or switching to another COM. This could be an RF feedback that gets induced through the headset cable. José Quote
dcastor Posted October 13, 2017 Report Posted October 13, 2017 I had a similar problem, found a short between the mic and phone jacks that only occurred when headset was plugged in. Try a different headset to make sure its not a in your headset. Dave C Quote
Flyin Bullfrog Posted October 13, 2017 Author Report Posted October 13, 2017 Mooney team. Mic squeal issue has been resolved. Thank go to the Dave Harlow tip. Issue was the sidetone volume in the GTN 650 that was set way too high and was causing the feedback. In order to adjust it, you have to get the GTN into configuration mode. Per Dave's instrictions I set into configuration mode by holding the HOME key when you power up and ONLY touched the dial tone-reduced fm a 65 nbr to 45(a swag). Worked on the ground, after start up, and perfectly in IMC thru an LPV approach. I did not adjust the Mic gain of my Zulu 3 headset upgrade. Want to reemphasize Dave's warning. "Of course you can really screw up your configuration once you are there. So be careful!" Another happy and 0 cost ending. Rico 2 Quote
bradp Posted October 13, 2017 Report Posted October 13, 2017 Pictures of your configuration pages stored on your phone are worth their weight in gold once you start messing around. -Brad 1 Quote
carusoam Posted October 14, 2017 Report Posted October 14, 2017 Great follow-up, Rico! Best regards, -a- Quote
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