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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. <br>
If you have your cos=usbinvert, then it needs to be grounded to see
a receiver active condition. <br>
<br>
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. <br>
<br>
You can test this by grounding the pin to see if you are getting a
receive active. <br>
<br>
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? <br>
<br>
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. <br>
<br>
<br>
Jon VA3RQ<br>
<br>
On 2/12/2012 11:14 AM, Jim Whiteside wrote:
<blockquote
cite="mid:CAPh2jj8KYQx9mZ2uSbp3WbL32febBWLgWCQ1DoNyXqWgPe4VTQ@mail.gmail.com"
type="cite">To answer a previous query - yes I'm pretty confident
it's a CM108 - lsusb reports "ID 0d8c:013c C-Media Electronics,
Inc."<br>
<br>
I did also wonder about the other ctcss settings but commenting
them out and reloading the config makes no difference.<br>
<br>
My app_rpt is version 0.287 - as supplied with the AllStar ACID
distro.<br>
<br>
Jim M0HPJ<br>
<br>
> I dont know if this has been fixed in more recent versions,
but if you<br>
> have the ctcss=no then you must comment out these arguments
in the<br>
> usbradio.conf:<br>
<br>
> ;txctcssdefault=94.8<br>
> ;rxctcssfreqs=94.8<br>
> ;txctcssfreqs=94.8<br>
<br>
> If you don't then App-Rpt is still looking for a valid ctcss
tone and<br>
> cor to activate.<br>
<br>
> Jon VA3RQ<br>
<br>
<br>
<br>
<div class="gmail_quote">On 12 February 2012 12:34, Jim Whiteside
<span dir="ltr"><<a moz-do-not-send="true"
href="mailto:jaydublu2002@gmail.com">jaydublu2002@gmail.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
> Assuming COS is connected to the Volume Down pin on the
CM108 then how about<br>
> plugging the fob into another PC which is not running the
Asterisk drivers<br>
> and see if the volume control is affected when COS is
asserted?<br>
<br>
> On my PC, if I press volume down, either on the keyboard
or on an unmodified<br>
> USB sound fob then a volume bar pops up in the centre of
the screen. It's<br>
> very visible.<br>
<br>
> Naturally, there may be a 'correct' way to do this with
some sort of built-in<br>
> diagnostics...<br>
<br>
> 73,<br>
<br>
> Andrew<br>
> ZL3AME<br>
<br>
That's a good plan.<br>
<br>
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.<br>
<br>
My modified fob - taking pin 48 to gnd also triggers the
volume down on Windows, so that suggests it's not hardware?<br>
<br>
Jim M0HPJ
<div class="HOEnZb">
<div class="h5"><br>
<br>
<div class="gmail_quote">On 12 February 2012 11:45, Jim
Whiteside <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:jaydublu2002@gmail.com" target="_blank">jaydublu2002@gmail.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">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.<br>
<br>
I've been following <a moz-do-not-send="true"
href="http://www.qsl.net/k0kn/cm108_mod.html"
target="_blank">http://www.qsl.net/k0kn/cm108_mod.html</a><br>
<br>
Can anyone advise if there's a way to determine from
the Asterisk side if COS is active or not?<br>
<br>
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'.<br>
<br>
My theory was, as soon as I have COS triggering
Asterisk correctly, then I can look at getting the
audio in working properly.<br>
<br>
TIA<br clear="all">
<br>
-- <br>
Jim Whiteside.<br>
M0HPJ<br>
<br>
<div style="margin-left:40px">
[usb28233]<br>
hdwtype=0 <br>
rxboost=1<br>
txboost=0<br>
rxctcssrelax=1<br>
txctcssdefault=94.8<br>
rxctcssfreqs=94.8 <br>
txctcssfreqs=94.8<br>
;rxctcssoverride=0<br>
carrierfrom=usbinvert<br>
ctcssfrom=no<br>
rxdemod=speaker<br>
txprelim=no<br>
txlimonly=no<br>
txtoctype=notone<br>
txmixa=composite<br>
txmixb=no<br>
invertptt=0<br>
duplex=0<br>
rxondelay=0<br>
rxnoisefiltype=0<br>
eeprom=0<br>
</div>
</blockquote>
</div>
<br>
<br clear="all">
<br>
</div>
</div>
<span class="HOEnZb"><font color="#888888">-- <br>
Jim Whiteside.<br>
</font></span></blockquote>
</div>
<br>
<br clear="all">
<br>
-- <br>
Jim Whiteside.<br>
<br>
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<br>
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