<div dir="ltr">Kevin,<div><br></div><div>Thanks for the response. Caught you on the hamvoip list as well.</div><div><br></div><div>So the primary question of this post still stands. Is there a way to tell ASL to receive audio from my microphone without the COS signal? </div><div><br></div><div>Maybe a change of direction. Can I pull discriminator audio from the UV82 and use usbradio instead of simpleusb? If I can't get it to work this way with the UV82, I do have some GM300s I may be able to use with de-emphasized audio. I am still in the very beginning stages of learning how all of this gets put together, so if I use some incorrect terminology, please forgive me. These lists have been very helpful!</div><div><br></div><div>Thanks,</div><div><br></div><div>James</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, May 2, 2019 at 4:45 PM Kevin Custer <<a href="mailto:kuggie@kuggie.com">kuggie@kuggie.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">James,<br>
<br>
From your description, and my extensive knowledge of the CM119, CM119A <br>
and its variants, I believe the chip is bad. You can try to add a 10k <br>
pull-up externally to 3.3V from pin 48, but I doubt it'll work. <br>
Hopefully you are using protection diodes on these hardware inputs, <br>
otherwise, that's what blew it up. Why? Here's why....<br>
<br>
There is much confusion surrounding the COS and CTCSS inputs to the <br>
CM1XX chipsets. Here is a dissertation I wrote some time ago, that <br>
hopefully explains the situation well:<br>
<br>
The COS and PL "hardware" logic inputs on CM1XX based radio adapters <br>
were originally the volume-up and volume-down functions, actuated by <br>
manual (push button tactile) switches in a standard audio adapter <br>
(FOB). These inputs are internally pulled high, to 3.3 V, and have to <br>
be pulled low enough to become valid. As such the push-button switches <br>
made a good ground when depressed, as that's what the other side of the <br>
switch was tied to - ground. Most AllStar radio adapters use protection <br>
diodes (BAT-43's) that don't allow voltage to be sent into the CM1XX <br>
chip. If voltage is allowed to be inputted to these pins, the chip is <br>
destroyed. So - with the diodes in place, it doesn't matter what voltage <br>
is present on the COS or CTCSS hardware inputs, because voltage on these <br>
pins doesn't make anything happen, and because of the protection diodes, <br>
doesn't hurt anything if voltage is present. Pull-up resistors are <br>
totally unnecessary, because we need a ground to assert the condition.<br>
<br>
Okay, so the CM108/119's logic inputs are looking for a ground to be <br>
valid. This "active low" condition is required NO MATTER if the setting <br>
in the conf file is upright or inverted. So - the setting in the <br>
configuration file doesn't change the fact that the adapter needs an <br>
active low to be valid and assert the condition. All this software <br>
setting does is change if the low condition exists when the radio is <br>
hearing a valid signal, or when it's not. Using a DMM, you can read the <br>
voltage on the CM119 side of the BAT-43 diodes to see if the logic level <br>
is properly changing from 3.3V (2.4 in some instances) to 0.0 (or a few <br>
tenths of a volt).<br>
<br>
Not all radio logic signals are created equal. Some logic circuits can <br>
source current, but lack the ability to sink. Sometimes active high <br>
circuits (circuits that provide a voltage when the state becomes active) <br>
don't have the ability to pull to ground very well. These circuits may <br>
not have the capability to pull the COS and CTCSS inputs low enough on <br>
the radio adapter to become valid/active. A pull-down resistor can <br>
help, but nothing beats a real active low circuit. A 2N2222 (or similar <br>
NPN transistor) with the emitter grounded usually works well.<br>
<br>
Hope this helps...<br>
<br>
Kevin<br>
<br>
<br>
<br>
On 5/2/2019 4:07 PM, James WD0JB wrote:<br>
> All,<br>
><br>
> Is there a way to manually key from the Asterisk command-line, or <br>
> other, to transmit when using a USB fob without the COS activated? I <br>
> have a fob that I cannot key with pin48 on CM119, but I still want to <br>
> use the fob, possibly as a radio-less node with a headset / <br>
> microphone. I cannot key with pin48 on the CM119 because there is not <br>
> the proper voltage on that pin to pull down.<br>
><br>
> If anyone has any suggestions, I am using the SYBA UAUD compact fob. <br>
> This Amazon link: <a href="https://www.amazon.com/dp/B001MSS6CS" rel="noreferrer" target="_blank">https://www.amazon.com/dp/B001MSS6CS</a><br>
><br>
> Also, these fobs (I've tried 2 so far) have an eeprom chip on them <br>
> (FT93C46A). Any others I've seen used in this manner from forum posts <br>
> do not appear to have this chip, however, removing the chip does not <br>
> resolve the issue. One fob has 200mv the other has about 1volt. <br>
> Nothing else connected to the pin.<br>
><br>
> Thanks in advance for any help.<br>
><br>
> James<br>
<br>
</blockquote></div><br clear="all"><div><br></div>-- <br><div dir="ltr" class="gmail_signature"><div dir="ltr"><div><div dir="ltr">73,</div><div dir="ltr"><br></div><div dir="ltr">James WD0JB</div></div></div></div>