[arm-allstar] simpleusb-tune

Wed Jun 22 07:34:42 EST 2016

The ring of the speaker jack is connected to the radio chassis ground via a zero ohm resistor. I'm not seen this before, and wonder why they call it a resistor on the schematic.

Thanks,
Bob
k6ecm
73

Sent from iPad

> On Jun 19, 2016, at 9:16 PM, David McGough via arm-allstar <arm-allstar at hamvoip.org> 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
> 
> _______________________________________________
> 
> 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