[arm-allstar] 60 second noise burst

[Doug Crompton]

Tom,

 As David pointed out the COS line is basically TTL levels. Depending on
the radio the COS either goes low or high to indicated a receive signal is
present. If it goes high from the radio then you want to use  USB for item
J in simpleusb-tune-menu. If it goes low on RX signal then you want to use
USBINVERT for item J.  The COS signal from the radio must go down close to
0 v for a low and above 2v for a high.

Removing or turning off the radio is generally not a good idea as the state
of COS canl be undetermined. It must be pulled high or low. There is a weak
pullup in the CM108/119 on the COS line. So for instance if you were using
item J as USB removing the radio would tell Allstar there was an RX signal.


*73 Doug*

*WA3DSP*

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

On Fri, Sep 21, 2018 at 11:33 PM "Tom Corcoran via ARM-allstar" <
arm-allstar at hamvoip.org> wrote:

>
>
> The ARS adapter has an LED that fires when the radio should be
> transmitting. So, if the radio were connected to the ARS adapter, I can see
> when the burst would have been transmitting. Will try your earlier
> suggestions.
>
>
> Tom VE3NY
>
> Thomas F. Corcoran P.Eng., MBA, ICD.D
>
> Chair, Health Professions Regulatory Advisory Council (HPRAC)
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