I do understand, however because it has a commercial flat audio point does not mean it has the appropriate noise component for the software to detect .
It has, when switched to 25 KHz, but the filtering of course also narrows audo bandwidth.
The white noise we are talking about is in the audio band above 3khz.. up to maybe 6-7 khz.. you might sweep your receiver there for flat audio and watch that with a scope.. flat in band audio does not mean flat to 6khz...
6 KHz is to much fur 12.5 KHz, of course.
The way to test that is see if the same radios align suitably in wideband mode assuming they can be programmed to test... If the URI cannot find an answer there.. it is most likely just a bad spot to pick noise from...
Like Jann already had mentioned, in wide band it is just fine. There can not be very much additional filtering, as I can pass P25 and D-Star through this output. This leads to a topic that I at least dropped here for two times, but with no response. I would like to route the flat audio from DC level up to some KHz through the PC, to allow P25 and D-Star through it. No codec, no DSP processing (maybe even regenerating the digital signals in a later version), no filtering. No LP, no HP. Nothing. Is there a possibility to enable this? Maybe even to route this over the internet, to allow linking of multi mode repeaters? It would be a great feature to have all the asterisk features, all the tone decoding stuff, DSP squelch - but without touching the audio.
What I will also add is the level output is different on many radios ( especially in 12k5) and in my case I had to play with external padding as well as the 20db gain/pad switch to get levels into a range the rx tuning software and hardware could deal with... The internal resistors of the URI are designed for a certain working range and load..
AFAIR the Motorolas are around 400 or 500 mV, but I am not sure.
Doug KD8B
With best regards Ralph.