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

[James WD0JB]

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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