Wind noise on internal microphone

User avatar
oe7abh
Posts: 88
Joined: Mon Aug 24, 2020 7:19 am
Location: Zillertal AUSTRIA
Contact:

Wind noise on internal microphone

Post by oe7abh » Tue Nov 22, 2022 1:19 pm

Hello,

compared to the GD77, the RT3s makes significantly more background noise with PTT without modulation!
Can anyone confirm that?
Can you do something about it?

73 Alfred OE7ABH

G4EML
Posts: 551
Joined: Sat Nov 16, 2019 10:01 am

Re: ALPHA version - Known problems

Post by G4EML » Tue Nov 22, 2022 4:18 pm

Please give some more information. What background noise are you hearing?

Colin. G4EML

User avatar
oe7abh
Posts: 88
Joined: Mon Aug 24, 2020 7:19 am
Location: Zillertal AUSTRIA
Contact:

Re: ALPHA version - Known problems

Post by oe7abh » Tue Nov 22, 2022 5:12 pm

On the GD77, there is almost no background noise on PTT without modulation.
On the Retevis RT3s, it sounds like wind noise.
With external handheld microphone, the effect is no longer present.
Alfred OE7ABH
Last edited by oe7abh on Wed Nov 23, 2022 9:19 am, edited 1 time in total.

G4EML
Posts: 551
Joined: Sat Nov 16, 2019 10:01 am

Re: ALPHA version - Known problems

Post by G4EML » Tue Nov 22, 2022 7:38 pm

I haven't noticed anything like that. It sounds like you may have a problem with the internal microphone. There is probably nothing the firmware can do about that.

One thing that might be worth trying is to reduce the microphone gain in the sound settings.


Colin.

User avatar
oe7abh
Posts: 88
Joined: Mon Aug 24, 2020 7:19 am
Location: Zillertal AUSTRIA
Contact:

Re: Wind noise on internal microphone

Post by oe7abh » Tue Nov 22, 2022 9:01 pm

Hi Colin,

AF level -> Without modulation -> PTT only!
With external handheld microphone, the effect is no longer present.
Info: External Antenna

Image

Alfred, OE7ABH

VK3KYY
Posts: 5134
Joined: Sat Nov 16, 2019 3:25 am
Location: Melbourne, Australia
Contact:

Re: Wind noise on internal microphone

Post by VK3KYY » Tue Nov 22, 2022 9:38 pm

oe7abh wrote:
Tue Nov 22, 2022 9:01 pm
Hi Colin,

AF level -> Without modulation -> PTT only!
With external handheld microphone, the effect is no longer present.
Info: External Antenna

Image

Alfred, OE7ABH
Just checked my RT3S and the mic level is 1/3 of what you are seeing.

As we've had several hundred downloads of the RT3S/UV380 firmware an no one else noticing this, I think its likely you have some internal noise on your radio

Some people have told me the FM audio gain is too high and they had to reduce it by 6dB or even 9dB, but my radio is too loud on FM, so there appears to be considerable variation in the electrical characteristics of these radios.

I can't remember if we compensate the mic bar graph for the FM or DMR gain controls, as we read the mic input level via the VOX sampling input, as on FM we can't access the raw audio samples

G4EML
Posts: 551
Joined: Sat Nov 16, 2019 10:01 am

Re: Wind noise on internal microphone

Post by G4EML » Tue Nov 22, 2022 10:47 pm

I have just checked and I agree with Roger, on both my MDUV380 and my MDUV390 the mic level with no modulation is between the D and the M of 'DMR'. It may be your radio has a very sensitive internal microphone, in which case you may need to reduce the DMR mic gain. The meter reading on DMR will reflect the change but on FM it will not.

Colin G4EML.

User avatar
oe7abh
Posts: 88
Joined: Mon Aug 24, 2020 7:19 am
Location: Zillertal AUSTRIA
Contact:

Re: Wind noise on internal microphone

Post by oe7abh » Wed Nov 23, 2022 7:25 am

Hello Roger, hello Colin!
Thanks for the quick reply!
I think it's the hardware. The radio is brand new!
At -15db it gets a little better, but doesn't eliminate the problem.
Alfred OE7ABH

Image
Image

User avatar
oe7abh
Posts: 88
Joined: Mon Aug 24, 2020 7:19 am
Location: Zillertal AUSTRIA
Contact:

Re: Wind noise on internal microphone

Post by oe7abh » Wed Nov 23, 2022 9:18 am


VK3KYY
Posts: 5134
Joined: Sat Nov 16, 2019 3:25 am
Location: Melbourne, Australia
Contact:

Re: Wind noise on internal microphone

Post by VK3KYY » Wed Nov 23, 2022 9:52 am

Did you try reverting to the official firmware and re-testing ?

I know it does not display the mic level in the official firmware, but if the mic is very noisy, I presume you can hear it e.g. on FM

Post Reply