USB and USBinvert are used only when you are using hardware signals from the radio to provide cor and CTCSS decode.

If you are using DSP for Carrierfrom and CTCSSFROM in your usbradio.conf file then the usb and usbinvert are not used.


If you were to use the hardware signals from the radio then you would select either usb or usbinvert depending the logic signal the radio provides.

For example: If you are using carrierfrom=usb then the cor line on the URI would need to be connected to the cor (or CAS). If the signal goes to ground with no signal (Squelched) and goes hi (unsquelched), the URI will see the logic signal and treat it as the squelch is open.

If the radio signal goes low WITH a signal (unsquelched) and goes hi (squelched) then set the carrierfrom to usbinvert.

So the usb setting is for signals that go hi (Active hi) and USBinvert is for signals that go low (Active low).

the same perameters also apply for the CTCSSfrom seting. for this the CTCSs decode line must also be connected in the URI.

One other note:

When using these hardware signals, it is important to know that the URI hardware detection depends on the transition going to ground and not providing a voltage. It is possible some radios will provide a voltage swing with a squelch or tone decode, but not go to ground when there is no voltage.

In the Master II, if I remember, the CTCSS decode does go to ground with the correct tone but does not provide a voltage. For this connection the usbinvert would work for ctcssfrom.

But, the CAS is the opposite and provides a voltage when unsquelched but doesn go to ground when squelched.

For this reason I alsways installed a NPN transistor to invert the signal in the radio to provide me with a Active low signal for CAS.

Since you are using DSP for Carrierfrom and ctcssfrom, then you can ignore the hardware signals.

Hope this helps,

Jon VA3RQ

On 9/20/2015 11:16 AM, Robert Newberry wrote:

I've gotten a lot of good info. I've got some work to do to figure this strange noise out.

I do have one question.

Ctcssfrom=dsp is what I use. I currently use a DMKURI. I've noticed the USB and USBinvert mention using a USB fob. Can anyone elaborate on the differences of these two?

N1XBM
Apparare Scientor
Paratus Communicare
Allstar Node # 27086, 41540, 41812, 42086
    



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