The responsive range of this
meter is 4-20 though the audio level input is can be
lower than 4 and higher than 20.
The VU meter is calibrated to a
baseline of all yellow and green bars plus one red
just flashing on the edge of illuminating while
pressing Touchtone number 5 on a MotoTRBO XPR-6500
HT keypad as it sends out roughly 1,000hz (dual)
tone. Calibration provides the dB levels vs
LED segments as measured by my
Sinadder 3 (More
To test with this resource,
always use your normal voice, normal
position, under normal conditions. Sounds easy
but it is not. Think about how other people
use cell phones, they talk louder when unaware of
the distraction they are causing. Most
people will speak softer when they are aware of the noise
they are creating or in this case when the OTA level
may be offensive. Most users will again, speak softer
when advised of their hot audio but it will creep
back up when they forget about it later. So try to
resist that temporary reaction. You could have your friends monitor your
audio at random times and report back to you later as to
where your audio falls when you are not thinking
about your audio levels. Most users tend to be
offended, even if they don't indicate it. So
try to be gentle and diplomatic. But a
temporary solution by saying that you will talk
softer or further from the mic IS NOT THE ANSWER.
You must reprogram for your voice and style or you
will fall back into that old method of speaking to
your radio and continue to violate acceptable levels
of audio as well as the clarity of your speech.
This human tendency cannot be emphasized enough!
The radio must be adjusted and likely the user will
need to modify the way they position the radio.
This is has been amazingly difficult to get users to
do. They don't need to listen to their own
audio but we do!
image on the left was what was seen when
Livestreamed back in 2013. The
target was to hit the
yellow bars without going into the red, paying
attention to the average
range of the bars.
1 red bar
occasionally is OK but no higher.
Anything else should merit your attention or
correction. This is different from a normal VU
level in other applications but was done to keep it
visually simple, just hit the
4 yellow segments on average
but never into the reds.
Greens only are too
low but better than hitting the
at left shows 4 of 5 yellows which is essentially
like, "This is K6HOT, VU Audio Test 1, 2, 3, 4, 5".
To "exercise" your audio, you might say "4" several times; long and sustained as
it provides a better view of the bars and tends to
be the hottest audio in the number string.
Turn your local audio up and listen
closely for syllables that confuse the vocoder as
well as breath puffs across the mic. These are
points that cause the most grief for the listeners
when your overall audio is too hot. Even when
audio is in the yellows, the vocoder may still have
trouble processing the sounds so listening closely
should help you determine if you should adjust your
position relative to the mic on the radio.
We hope that you will become
"Audio Active" in that you will try to generate good
audio over the PNW DMR network as well as help
others to so. If you hear poor audio, let the
user know and over to assist them with your VU
meter. You don't need to be the "Audio Police"
but you can make a difference if you make the effort
on behalf of all members of our network.
-- Mike, NO7RF, 3-29-2018