[App_rpt-users] stuck transmitting/timedout, can't get it to unkey

[Jon Rorke]

The URI and modified fobs need to see a hardware signal that goes to 
ground on an active hi or low state.  If one is using hardware cor from 
a radio, then it needs to pull to ground if active low or active hi. It 
does not need to have a voltage output. It just needs to pull to ground.

If your radio is sourcing a voltage but doesn't pull to ground then the 
URI or fob may not see a signal change and think the cor is open. App_ 
Rpt may think the receiver is open depending on your settings in 
usbradio.conf in the "COR from" line.

This is because any sourced voltage from the radio is blocked by the 
diode going to one of the input lines. The CM108 chip has internal 
pullup resistors on its cor input lines so it doesnt need external 
voltage, hence the diode in line.

In all may systems I modify the radios to have open collector that pulls 
to ground on a signal. All my systems are "active low" this way.  If you 
have a radio that doesn't pull to ground then you can use the cor signal 
to drive an NPN transistor. connect the collector to the fob/ URI and 
invert your setting in usbradio.conf.

One other thing, On simplex nodes I have seen some radios where the cor 
goes active on transmit when connected through the Packet interface  to 
fobs/URIs. In this case you might want to use DSP squelch instead of 
external hardware for cor.

Just some thoughts.

Jon VA3RQ

On 11/5/2010 8:23 AM, Neil Addis (WA5JXY) wrote:
> Did it ever work correctly?
> Have you checked the COR line or COR settings?
>
> Neil
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