T4win Waveform comparison...

[SCPD]

Clipped..hmmm. This is from my tapped PRO-2053. I forget the resistor value. RFmobile does this look any better?

It looks clipped - the corners should be slightly rounded. Are you tapping the signal before or after the radio's internal data slicer? If you're getting the signal after it's been squared by the radio, then that's fine.

Obviously the EDACS decoder doesn't mind but if you plan to pick up P25 signals, it won't work. I'm not sure what effect clipping has on MPT1327 signals ... we'll see.

-rick

 

[funkytones]

so if i was running this waveform:

on unitrunker... it wouldnt decode? can that waveform be cleaned up still? i dont have the trained eye yet when looking at waves... still getting there... i'll play with the resistors this weekend some... have to make a emergency last minute family trip so i will be without digital or trunked systems for the rest of the week... yep... heading into the boons

and just to make sure i am on the same page... "Clipping" is when the peaks and valleys are leveled off? or rounded so to speak?

 

[SCPD]

so if i was running this waveform on unitrunker... it wouldnt decode?

This one looks good.

"Clipping" is when the peaks and valleys are leveled off? or rounded so to speak?

Here's an example of clipping. Say you have an amplifier that is capable of driving a signal between +5 and -5 volts. It can't go any higher or lower because those are the limits on the +'ve and -'ve power rails. Say this same hypothetical amplifier has a voltage gain of 10. In other words, the output voltage is 10 times the signal input voltage. If you feed this amp a signal that varies between +0.5 and -0.5 volts you'll get the full output swing of +5 to -5 volts. Now imagine increasing the input signal from +/- 0.5 volts to +/- 0.6 volts. The portion of the input signal that exceeds 0.5 volts will appear clipped on the output because the amplifier's output can't exceed +5 volts.

-rick