[arm-allstar] simpleusb-tune

[David McGough]

Actually, I meant the jack "sleeve", not "ring"!

(yeah, been a long day!)



On Mon, 20 Jun 2016, David McGough via arm-allstar wrote:

> 
> Hi Bob,
> 
> I'm not sure about the FT-1500M, but these days radios frequently have
> class-D speaker amps and they can't have the "ring" of the external
> speaker terminal shorted directly to ground (e.g.: URI pin 19).
> 
> If you have a small 1:1 audio isolation transformer, that might help 
> between the external speaker jack and URI pins 21 / 19, assuming the 
> problem is that the external speaker ground is "floating," from the 
> radio's perspective.
> 
> Since the FT-1500M has a mini-DIN plug for TNC connection, etc., that 
> would probably work as an alternative interface method.
> 
> Anyone know for sure about the FT-1500M external speaker plug and 
> grounding the "ring" side of the jack?
> 
> 
> 73, David KB4FXC
> 
> 
> 
> 
> On Sun, 19 Jun 2016, Bob via arm-allstar wrote:
> 
> > 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
> > > http://lists.hamvoip.org/cgi-bin/mailman/listinfo/arm-allstar
> > > 
> > > Visit the BBB and RPi2 web page - http://hamvoip.org
> > > 
> > 
> > 
> 
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