Maestro TX audio quality

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  • Updated 2 weeks ago
Hello,
I've only spent a few hours with the Maestro so far. but I'll admit to a little frustration trying to get top-quality TX audio out of it. I get excellent reports on both AM and SSB - using the 6400M radio mic port - with a variety of mics and profiles, but no such luck yet with the Maestro.  Reports are that the audio is "pinched" or "crunchy". I've listened to both live and recorded samples using Full Duplex mode and I agree. There's been no difference between antenna and dummy load tests at low and full power, so my assumption is that RF isn't an issue.

I've tried a fairly large sampling of mics with various settings - EQ, processor, gain, preamp. Dynamic mics obviously use no bias supply, electrets do. The pro-audio condenser mics get 48V phantom power from a small mixer I have dedicated to the purpose. The broadcast dynamics need more gain and some positive EQ from 2K up to whatever filter edge is in use.

My intended use for the Maestro isn't stringent, (armchair and RV mobile) but so far TX audio quality is a non-starter. Am I tripping over the compression codec?

I realize I'm probably one of the worst possible candidates for networked operation. I dislike distortion and latency intensely, but I have to think I'm doing something wrong here - I just don't know what.

So after all that - can someone tell me they're getting great audio reports from their Maestro? If so, I'll just tilt the lance and keep poking at the windmill.

Thanks,
Jim N7CXI
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Jim - N7CXI

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  • frustrated...

Posted 3 weeks ago

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David Decoons wo2x, Elmer

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Hi Jim,

Which mic connector are you using? MIC1 is the RJ45 and MIC2 is the 3.5mm TRS connector.

MIC2 uses tip as MIC+ and Shell as MIC-. The Ring connection is for PTT.

Dave wo2x


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Jim - N7CXI

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Hi Dave,
I'm using MIC2, the 3.5mm TRS connector.

According to the user guide, MIC2 is unbalanced :

TIP       audio
RING    PTT
SHELL  GND

Now I R confused... !  

Thanks,
--jim


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David Decoons wo2x, Elmer

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Are you using WiFi? Can you try an Ethernet connection to see if it is better?

Dave wo2x
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Jim - N7CXI

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Not yet. I did try 3 different WAP's, two of which are high-end MikroTik critters that are connected to my network with GigE copper. The third is a generic NetGear with a 100Mb NIC that I tried just in case there was some compatibility issue with the MikroTik's. In any case, total packet loss was in the low single digits in all cases after 5 or so minutes of operation.

I will try plugging into a switch here in  a bit and see what happens. Maybe I've missed something.


Thanks,

Jim N7CXI
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Jim - N7CXI

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... and the funny part is that I wrote the above response on a Mac, but the forum software wouldn't let me post it. I had to email it to myself then paste it from a Windows box.

Batting 1000 tonight. 
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Jim - N7CXI

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  - experiment completed. I plugged the Maestro into the same gigabit L2 switch the radio is on, and the behavior is exactly the same. If I load the [whatever it is] 107 WIDE profile, about 2 times out of three it will throw the Maestro into a stuttering fit that "infects" the 6400M. The only cure is to power cycle both.

I tried uploading a video, no soap. I'm posting it to one of my servers and paste a link, we'll see if that works.

Bear in mind the 6400M seems to work on its own. I opened up UPNP in my edge router, and connected the rig from the office yesterday using SmartSDR and SmartLink. Its ran around 1.5 to 1.6 Mbs, but worked ok. Anything's possible, but at this point a problem with my network doesn't seem likely.

Here's that video link:
http://barberdsp.com/downloads/maestro.mp4

Thanks,
--jim

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Jim - N7CXI

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Make that profile "RadioSport WIDE M207" . The radio and the Maestro rebooting while I was writing the email.

Jim N7CXI