[App_rpt-users] Debugging COS

REDBUTTON_CTRL jrorke at cogeco.ca
Sun Feb 12 11:26:40 EST 2012


One last thing about the cos input. It has an internal pullup resistor 
so it is looking for an "active low" or the pin needs to be grounded to 
see activity.
If you have your cos=usbinvert, then it needs to be grounded to see a 
receiver active condition.

If you have it set to "usb" then it is normally low (grounded) and then 
the input should go to a "float hi"  or "hi Z" to see receiver activity.

You can test this by grounding the pin to see if you are getting a 
receive active.

If the signal you are connecting to that pin sources voltage then that 
voltage is blocked by the diode. But it when that signal "goes low" does 
it ground the signal or just doesn't source any voltage?

This does make a difference. As I said above the important thing is when 
your input signal goes low it must ground the cos line through the diode 
on the fob.


Jon VA3RQ

On 2/12/2012 11:14 AM, Jim Whiteside wrote:
> To answer a previous query - yes I'm pretty confident it's a CM108 - 
> lsusb reports "ID 0d8c:013c C-Media Electronics, Inc."
>
> I did also wonder about the other ctcss settings but commenting them 
> out and reloading the config makes no difference.
>
> My app_rpt is version 0.287 - as supplied with the AllStar ACID distro.
>
> Jim M0HPJ
>
> > I dont know if this has been fixed in more recent versions, but if you
> > have the ctcss=no then you must comment out these arguments in the
> > usbradio.conf:
>
> > ;txctcssdefault=94.8
> > ;rxctcssfreqs=94.8
> > ;txctcssfreqs=94.8
>
> > If you don't then App-Rpt is still looking for a valid ctcss tone and
> > cor to activate.
>
> > Jon VA3RQ
>
>
>
> On 12 February 2012 12:34, Jim Whiteside <jaydublu2002 at gmail.com 
> <mailto:jaydublu2002 at gmail.com>> wrote:
>
>     > Assuming COS is connected to the Volume Down pin on the CM108
>     then how about
>     > plugging the fob into another PC which is not running the
>     Asterisk drivers
>     > and see if the volume control is affected when COS is asserted?
>
>     > On my PC, if I press volume down, either on the keyboard or on
>     an unmodified
>     > USB sound fob then a volume bar pops up in the centre of the
>     screen.  It's
>     > very visible.
>
>     > Naturally, there may be a 'correct' way to do this with some
>     sort of built-in
>     > diagnostics...
>
>     > 73,
>
>     > Andrew
>     > ZL3AME
>
>     That's a good plan.
>
>     So I take an unmodified fob, that does have volume buttons on, and
>     plug it into a PC. 'volume down' button does indeed trigger the
>     windows volume bar. But this fob and button don't do anything on
>     Asterisk.
>
>     My modified fob - taking pin 48 to gnd also triggers the volume
>     down on Windows, so that suggests it's not hardware?
>
>     Jim M0HPJ
>
>
>     On 12 February 2012 11:45, Jim Whiteside <jaydublu2002 at gmail.com
>     <mailto:jaydublu2002 at gmail.com>> wrote:
>
>         I'm still chipping away at modifying a Startech CM108 USB fob
>         - so far I have successfully got PTT and audio out working,
>         but I'm struggling with audio in and COS.
>
>         I've been following http://www.qsl.net/k0kn/cm108_mod.html
>
>         Can anyone advise if there's a way to determine from the
>         Asterisk side if COS is active or not?
>
>         I've even tried manually taking the CM108 pin 48 to 0v and +5v
>         with the iax.conf below, but I can't seem to make anything
>         'happen'.
>
>         My theory was, as soon as I have COS triggering Asterisk
>         correctly, then I can look at getting the audio in working
>         properly.
>
>         TIA
>
>         -- 
>         Jim Whiteside.
>         M0HPJ
>
>         [usb28233]
>         hdwtype=0
>         rxboost=1
>         txboost=0
>         rxctcssrelax=1
>         txctcssdefault=94.8
>         rxctcssfreqs=94.8
>         txctcssfreqs=94.8
>         ;rxctcssoverride=0
>         carrierfrom=usbinvert
>         ctcssfrom=no
>         rxdemod=speaker
>         txprelim=no
>         txlimonly=no
>         txtoctype=notone
>         txmixa=composite
>         txmixb=no
>         invertptt=0
>         duplex=0
>         rxondelay=0
>         rxnoisefiltype=0
>         eeprom=0
>
>
>
>
>     -- 
>     Jim Whiteside.
>
>
>
>
> -- 
> Jim Whiteside.
>
>
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