[App_rpt-users] Manually key ASL from command-line

[Steve L]

I believe that you can accomplish VOX operation by configuring the
"carrierfrom" and "ctcssfrom" parameters in /etc/simpleusb.conf  to
"no" in your Allstar node configs.

On Thu, May 2, 2019 at 4:54 PM James WD0JB <James.WD0JB at gmail.com> wrote:
>
> Kevin,
>
> Thanks for the response.  Caught you on the hamvoip list as well.
>
> 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?
>
> 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!
>
> Thanks,
>
> James
>
> On Thu, May 2, 2019 at 4:45 PM Kevin Custer <kuggie at kuggie.com> wrote:
>>
>> James,
>>
>>  From your description, and my extensive knowledge of the CM119, CM119A
>> and its variants, I believe the chip is bad.  You can try to add a 10k
>> pull-up externally to 3.3V from pin 48, but I doubt it'll work.
>> Hopefully you are using protection diodes on these hardware inputs,
>> otherwise, that's what blew it up.  Why?  Here's why....
>>
>> There is much confusion surrounding the COS and CTCSS inputs to the
>> CM1XX chipsets.  Here is a dissertation I wrote some time ago, that
>> hopefully explains the situation well:
>>
>> The COS and PL "hardware" logic inputs on CM1XX based radio adapters
>> were originally the volume-up and volume-down functions, actuated by
>> manual (push button tactile) switches in a standard audio adapter
>> (FOB).  These inputs are internally pulled high, to 3.3 V, and have to
>> be pulled low enough to become valid.  As such the push-button switches
>> made a good ground when depressed, as that's what the other side of the
>> switch was tied to - ground. Most AllStar radio adapters use protection
>> diodes (BAT-43's) that don't allow voltage to be sent into the CM1XX
>> chip.  If voltage is allowed to be inputted to these pins, the chip is
>> destroyed. So - with the diodes in place, it doesn't matter what voltage
>> is present on the COS or CTCSS hardware inputs, because voltage on these
>> pins doesn't make anything happen, and because of the protection diodes,
>> doesn't hurt anything if voltage is present. Pull-up resistors are
>> totally unnecessary, because we need a ground to assert the condition.
>>
>> Okay, so the CM108/119's logic inputs are looking for a ground to be
>> valid.  This "active low" condition is required NO MATTER if the setting
>> in the conf file is upright or inverted.  So - the setting in the
>> configuration file doesn't change the fact that the adapter needs an
>> active low to be valid and assert the condition. All this software
>> setting does is change if the low condition exists when the radio is
>> hearing a valid signal, or when it's not.  Using a DMM, you can read the
>> voltage on the CM119 side of the BAT-43 diodes to see if the logic level
>> is properly changing from 3.3V (2.4 in some instances) to 0.0 (or a few
>> tenths of a volt).
>>
>> Not all radio logic signals are created equal.  Some logic circuits can
>> source current, but lack the ability to sink. Sometimes active high
>> circuits (circuits that provide a voltage when the state becomes active)
>> don't have the ability to pull to ground very well. These circuits may
>> not have the capability to pull the COS and CTCSS inputs low enough on
>> the radio adapter to become valid/active.  A pull-down resistor can
>> help, but nothing beats a real active low circuit.  A 2N2222 (or similar
>> NPN transistor) with the emitter grounded usually works well.
>>
>> Hope this helps...
>>
>> Kevin
>>
>>
>>
>> On 5/2/2019 4:07 PM, James WD0JB wrote:
>> > All,
>> >
>> > Is there a way to manually key from the Asterisk command-line, or
>> > other, to transmit when using a USB fob without the COS activated?  I
>> > have a fob that I cannot key with pin48 on CM119, but I still want to
>> > use the fob, possibly as a radio-less node with a headset /
>> > microphone. I cannot key with pin48 on the CM119 because there is not
>> > the proper voltage on that pin to pull down.
>> >
>> > If anyone has any suggestions, I am using the SYBA UAUD compact fob.
>> > This Amazon link: https://www.amazon.com/dp/B001MSS6CS
>> >
>> > Also, these fobs (I've tried 2 so far) have an eeprom chip on them
>> > (FT93C46A).  Any others I've seen used in this manner from forum posts
>> > do not appear to have this chip, however, removing the chip does not
>> > resolve the issue.  One fob has 200mv the other has about 1volt.
>> > Nothing else connected to the pin.
>> >
>> > Thanks in advance for any help.
>> >
>> > James
>>
>
>
> --
> 73,
>
> James WD0JB
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