Audio background noise when transmitting

VA3EFX

I have had no problems with the OS3 since being set up when received a few days ago, except for 1 issue when using with my ID-51 Plus2. I have also used the OS3 with my ID-4100 and there is no similar issue, so only the ID-51 has this occurring.

The issue is that when transmitting, there is always a constant background noise which is being heard from other stations and myself when I use an echo test server to play back my audio. It sounds like a washing machine type noise and perhaps this is what jjnnichols3 was referring to with the term "warbly" sound. His post was titled "Improving D-Star Audio" on Jan.21. However, maybe not the same issue as what I'm experiencing.

I believe that since it is only the ID-51 having this problem, it is likely the radio and not the OS3 or my home WIFI affecting the transmission audio quality. I've tried adjusting the mike gain and transmit power levels on the radio which did not eliminate the issue.

I'm wondering if anyone, including SharkRF Support, has experienced this same issue with their radio and what was involved to resolve, if able.

Thanks

HA2NON

We have 2 ID51s and we don't have any issues with them.

VA3EFX

Ok thanks. I'll continue trying to figure out what the issue is being caused by.

Leon1919

VA3EFX

Did you find the cause of the background noise ? I have it as well with my ft-3 in C4FM. Sounds like a Train ;-)

HA2NON

Leon1919 Have you ran C4FM Half Deviation AutoCal, or manually adjusted the RX offset for the lowest BER?

Leon1919

HA2NON

Yes I did. BER is 0,2%. I know that there is an issue with the yaesu ft2 to ft5. They have some background Noise in YSF. Wires-x seems to be ok. I did some testing with mic gain and modem settings. My mmdvm Hotspot has Same noise but Not so loud. Maybe ist can be reduced by the right Modem Settings. I Upload a sample Audio file.

sound file