Skyler, I am not familiar with the TK941 radios. However the URI looks for a signal that pulls to ground for the COR and PL inputs if you are using hardware squelch. If the URI doesnt see the hardware squelch opening then it will not pass audio to the transmitter.

This means the COR line from the radio must either pull to ground when there is no signal (USB) or pulls to ground when the is a signal (USBinvert).

Some radios will output a voltage change with the squelch but doesn't pull all the way to ground.

The URI doesnt care about input voltage as it has internal diodes to block any voltage coming in, so it only cares if the signal goes to ground or not.

I suggest you connect the cor signal from the kenwood to the base on an NPN transistor through a 4.7k resistor. Connect the Emitter to ground and the collector to the URI COR input.

If the COR voltage goes hi on the Kenwood when the squelch opens, then the collector on the transistor will go to ground.

Set the COR from to USB invert. in usbradio.conf.
comment outany PL tones, and set CTCSSfrom to no.

Restart Asterisk. Then see if its detecting the COR line.

Jon VA3RQ

On 1/31/2016 11:14 AM, Skyler F wrote:
I am really confused right now.

I am using a URI with some kenwood TK-941 radios for a repeater. I am using De-emphasized audio.

Here is what is happening. I am using usbradio.

I set the rxctcssoverride to 1 for testing.

I turn the squelch off in the radio, and put carrier from to DSP. (Yes, I know, this is the wrong type of audio for DSP). I go to radio tune menu, set the squelch to zero, and I hear the white noise being repeated perfectly.

Now, I set the carrier from to USB. When I turn the squelch off on the radio, the red light enables, and the transmitter transmits. However ... There is no white noise being repeated, just a plain carrier. What???

I tried this on the computer as well as the raspberry pi. My audio input is on the left channel. Even when I set the input volume to 999, I still don't hear anything, just a carrier.

So I know
-Speaker Audio is coming into the computer through the URI
-When DSP is enabled, and the squelch is set to zero both on the computer and the radio, audio is repeated
-COR is set up because the transmitter will key up when the receiver gets a signal

So now I need to figure out what is preventing the audio from rebroadcast when the input is set to usbinvert.

73
Skyler KD0WHB


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