[arm-allstar] simpleusb-tune

[Bob]

Attempting to use simpleusb-tune-menu on a BBB using a service monitor (3
kHz deviation, 1 kHz modulation). The output from the radio (FT-1500M) is
the speaker audio out of the back. It seems that full volume (quite loud on
the speaker) is not coming close to enough signal.

 

>From simpleusb-tune-menu

 

Please enter your selection now: 2

RX VOICE DISPLAY:

                                                 v -- 3KHz        v -- 5KHz

 

|========>
|

 

This is using 999. If this is linear, or close, then I doubt the 2x gain amp
will provide enough. I'm not sure what I've done wrong. The input to URIx is
pin 21, with 19 gnd. The iaxrpt level is about 2/3 max.

 

Any thoughts?

 

Thanks,

Bob

k6ecm

73

 

 

  _____  

From: arm-allstar [mailto:arm-allstar-bounces at hamvoip.org] On Behalf Of Doug
Crompton via arm-allstar
Sent: Monday, June 06, 2016 11:35 PM
To: ARM Allstar
Cc: Doug Crompton
Subject: Re: [arm-allstar] simpleusb-tune

 

I find that voice levels are highly dependent on the person speaking, the
rig they are using, the node radio,  and probably a dozen other factors.
Generally setting the audio so you see peaks just above 5 khz should be OK.
Some radios have better limiting than othesr and the peaks are well defined.
On some you can see peaks go well above what you would call max but the
average is much lower. One thing you don't want to do is have it set too
high. Digital distortion is very annoying. I often use iaxrpt's level meter
for adjusting or looking at multiple users for comparison. If you are
filling the iaxrpt bar graph to 9o-95% without hitting the edge you are
good.

I often find that one node that shows 80% peaks actually sounds louder than
one that shows 95% peaks. Audio characteristics and equalization can play
games with your ears! I don't think setting using DTMF is always a good idea
because DTMF levels can be quite different than voice through the
microphone. 

Some radios like the Chinese variety handhelds have greatly varying audio
levels depending on how far you are from the mic. You almost have to eat the
mic on some of them to have a decent level of audio and then you have breath
noise.

If you use a wide range of radios that you use to talk to your node it is
best to check them all. You may have to come up with an average setting so
that the loudest radio does not distort. 

Talk into the radios the way you would when you are not thinking. If you
adjust it talking right into the mic and then when you aren't thinking you
usually talk 2 inches away the level is not going to be right.

In the future we hope to have audio processing capability added to the code
to help fix some of these problems. 

73 Doug
WA3DSP
http://www.crompton.com/hamradio



> To: arm-allstar at hamvoip.org
> Date: Mon, 6 Jun 2016 20:36:18 -0700
> Subject: [arm-allstar] simpleusb-tune
> From: arm-allstar at hamvoip.org
> CC: k6ecm1 at gmail.com
> 
> 
> What should I see as I change input audio levels? Is there a recommended
FM
> deviation? Is this the 3KHz and 5KHz? When I get it right, what should the
> display indicate?
> 
> Thanks,
> Bob
> k6ecm
> 73
> 
> 1) Select USB device
> 2) Set Rx Voice Level (using display)
> 3) Set Transmit A Level
> .
> .
> .
> 
> Please enter your selection now: 2
> RX VOICE DISPLAY:
> v -- 3KHz v -- 5KHz
> 
> Current setting on Rx Channel is 0
> Enter new value (0-999, or CR for none): 500
> Changed setting on RX Channel to 500
> RX VOICE DISPLAY:
> v -- 3KHz v -- 5KHz
> 
> _______________________________________________
> 
> arm-allstar mailing list
> arm-allstar at hamvoip.org
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> 
> Visit the BBB and RPi2 web page - http://hamvoip.org
> 

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