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I realize this question is older, but for me this happens when I have "Mic Boost" turned up in alsamixer. Not the answer you're looking for?Browse other questions tagged sound headphones or ask your own question.
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Why doesn't Stream#reduce implicitly accept an accumulative function handling super type elements? We had a customer express some concern that the PWM decoder frequency was faster and may burn out an analog servo. As blogged a couple of weeks ago, we recently achieved Australian C-Tick compliance for the Taranis Plus. We are pleased to announce that we have achieved Australian C-Tick accreditation for the brand new Taranis Plus. We will be offering two versions of the Taranis Plus, one being fully accredited C-Tick with appropriate stickers and a second cheaper non C-Tick version. Over recent months murzwern has carried out numerous tests of the Taranis with a 5dbi antenna mod. In this test, we go back to begin with a stock Taranis and the new long range L9R receiver from Frsky.
Many people, myself included, have struggled to upgrade their Taranis OpenTX firmware to version 2 and beyond. Important: We are achieving better results by soldering the pigtail direct to the XJT board. In subsequent tests, we will focus on the impact of other variables that will provide a stronger link and longer range. Let me start by saying I am a huge fan of the Taranis, to the point where I don’t think I will need to buy another radio for a very long time. A lot of good work has been done on this topic already, and from my understanding it looks like this method solves it completely – very low noise with internal and external modules, speaker and headphones, and no clicking as you adjust the volume.
He identified where the audio circuit runs by using a cool EMI scanner thing, isolating these two wires on the jumper harness.

While I had the case open I decided to upgrade the tiny speaker in the hope of getting a clearer sound with more mid range.
I cut off the ends to make a cone and cut out 2 ‘V’ notches so it fitted flush against the case moulding.
For those who need it louder, you could try using a speaker with a higher watt rating, such as this one. I’d be interested to hear how other people get on with these mods or any other methods they try.
Please note that we are achieving better results without the ufl connector by soldering the pigtail direct to the XJT board.
Our goal for these tests remain the same, achieve 5-10km by doing the most simple low cost mods to achieve decent FPV range. Depending on where the headphone cables is running it might be some kind of magnetic or elec interference. This make sense as it is running on a different chip with its own clock and timing triggers.
Yes these additional mods may provide further range, however, our goal is a more solid link in a variety of conditions. While I am enjoying learning about all the features and functions, there was one thing spoiling it for me – the audio quality.
However, being ham-fisted with the soldering iron (and lazy) that all looked too risky and intimidating for me.
Not being an electrical genius I poked about with a kitchen knife to confirm that my radio was the same.
All in all I’m very happy with the outcome, now audio quality is great and I can get on with the real stuff – flying! Despite numerous tests and consultation with RF experts, we still cannot determine why this is the case. If it is, play around with alsamixer (in my case it was one of the playback sliders) until your own voice is no longer amplified.

As the TX mod worked so well, we need to get another stock TX over to murzwern to test the L9R range properly.
Accordingly, best guess is that the new L9R will achieve +6km which is inline with Frksy’s claim that the receiver doubles the range!
The voice alerts are a huge part of using this radio to the full and my Taranis buzzed and hummed through the speaker at a volume that I couldn’t accept.
I found that touching the knife against those two wires caused the buzz to stop almost completely. Varying the volume no longer affects the buzz either so I guess the residual EMI noise is happening before the amplifier. Finally I glued a lump of foam over the back of the speaker as I heard this improves the bass response. Although we do cover a little of Companion here, the main objective is to get the correct driver working so that Companion will talk to your TX.
I found this excellent write-up by a very smart person called Tom and decided to try his method. Unfortunately you still get bad noise with the headphones plugged in, but I think that’s from induction into the headphone cable itself. To avoid distortion or even blowing your speaker, set the volumes in the ‘radio setup’ menu to as loud as it will go without distorting (voice is controlled by ‘wav volume’). Then if you use a custom function to assign volume to one of the knobs, it will control volume within that limited range.

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