Welcome to the FlexRadio Community! Please review the new Community Rules and other important new Community information on the Message Board.
Need the latest SmartSDR or 4O3A Genius Product Software?
SmartSDR v4.1.5 | SmartSDR v4.1.5 Release Notes
SmartSDR v3.10.15 | SmartSDR v3.10.15 Release Notes
The latest 4O3A Genius Product Software and Firmware
If you are having a problem, please refer to the product documentation or check the Help Center for known solutions.
Need technical support from FlexRadio? It's as simple as Creating a HelpDesk ticket.

DAX Audio over SmartLink choppy...

ok2it
ok2it Member ✭
in FLEX-6000 Signature Series
Hello I know this has been asked before but I am struggling a lot. I am network engineer by trade, and I tried everything from IPSec/L2TPv3 , VPNs with low latency but I am not getting anywhere. I am travelling and WPX RTTY is on but I can onsly SWL as my TX signal is just dirty...not dirty TX but audio is distorted, chopped, and it looks like lot of packets are lost, altough if I use Virtual Audio Cables, all works fine. This seems to be somehow bound to DAX Audio only.
https://ctrlv.link/TTtG
That is screenshot and I am also listening to MON and sounds horrible. Tried single tone, two tone test on TX same results, regardless of TX Levels. Works fine locally, but even if I go just to next internet conenction (I have 2 x FTTH 1000mbps lines on my remote QTH) and I go from one to another, with latency bellow 25mS constant, zero jitter buffer needed, it happenes as well.
I saw suggestion to reboot do radio, done that, it helped for a minute or two and then started all over again. I also seem to remember it got worse as I moved up the FW. Currently sitting at 3.6.8 as I tried 4, but didnt work with iOS APPs I am using and I lost Waveforms for FreeDV.

Runnig Flex 6300 baby, v3, using Extreme Networks infrastructure. Any hints?

Thanks Jiri OK2IT

Answers

  • Mike-VA3MW
    Mike-VA3MW Administrator, FlexRadio Employee, Community Manager, Super Elmer, Moderator admin

    Does this happen only on a remote connection and not on a local connection? I am guessing this is a remote connection failure.

    Can you recreate in on SmartSDR v4.1.5 (which is free)?

    Does the same problem happen if using SmartLink? This is critical, as when using SmartLink the radio uses a totally different audio codec than when the radio is on a local LAN (or VPN). In both cases, the VITA49 packets that have the data are a UDP stream. It does sound like your UDP stream is getting throttled at some please.

    It can also be related to the DPC Latency in the PC or even windows drivers on the PC if they are old.

    The first thing we want to do is see if you can recreate this with a link.local connection to the radio to show if the issue is the radio or the transport layer. Given your background, that should be a simple test.

    SmartSDR v4.1.5 does with with iOS Apps. I use it all the time. But, I have also struggled with Audio issues on my iPhone and I have come to the conclusion the problem is in the iPhone network stack. Somedays it works fine, and others, it does not. One time I think I got to the conclusion my audio was bad if location services on the iPhone was turned on. You might want to give that a try.

    Let us know what you find.

Leave a Comment

Rich Text Editor. To edit a paragraph's style, hit tab to get to the paragraph menu. From there you will be able to pick one style. Nothing defaults to paragraph. An inline formatting menu will show up when you select text. Hit tab to get into that menu. Some elements, such as rich link embeds, images, loading indicators, and error messages may get inserted into the editor. You may navigate to these using the arrow keys inside of the editor and delete them with the delete or backspace key.

Comment As ...

Categories