[arm-allstar] simplified USB sound fob

[Doug Crompton]

Robert,

 The high level is at least 2.5 volts. Low would be less than .5 and
probably close to 0.  You can key it on and off using the Asterisk client
and "susb
 key|unkey" command. Try it with no load as there may be something pulling
it down in the external circuit.

The cheap FOBS do have quality issues. When you buy 10 often something is
wrong with at least one of them. That's the cost of cheap! They are
throw-aways.


*73 Doug*

*WA3DSP*

*http://www.crompton.com/hamradio <http://www.crompton.com/hamradio>*



On Sat, Dec 23, 2017 at 5:32 PM, "Robert Newberry via arm-allstar" <
arm-allstar at hamvoip.org> wrote:

> I am troubleshooting a simplified usb sound fob from the hamvoip webpage. I
> bought a batch of these a long time ago and all have been great. I have one
> that I can not get to PTT. I've checked the 2n7000 to make sure it works.
>
> I'm wondering if I am not getting anything from GPIO 13. How much voltage
> should I be seeing from GPIO 13 when it becomes active?
>
> Thank you
>
> N1XBM
> Apparare Scientor
> Paratus Communicare
> Allstar Node # 27086, 41540, 41812, 42086, 42658, 42657
> www.radioguysrepeaternetwork.com
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