[arm-allstar] Simple USB

[Doug Crompton]

Steve,

 The problem is it would have no absolute meaning only relative to what you
had previously setup with a "real" physical meter. It would have no
calibration to anything. Most rigs have no way to set TX level other than
padding with resistors. If every rig had a set input level and impedance
than a level meter would work otherwise it would just confuse the issue and
be meaningless to the actual TX deviation.


*73 Doug*

*WA3DSP*

*http://www.crompton.com/hamradio <http://www.crompton.com/hamradio>*

On Sun, Aug 4, 2019 at 3:40 PM "Stephen Gansky via ARM-allstar" <
arm-allstar at hamvoip.org> wrote:

> Doug
>
> I completely agree with what you said but I feel that a “meter” on the TX
> side would still be helpful.
>
> Steve
>
>
> Sent from sgansky iPad
> (C) 215-990-5300
>
> > On Aug 4, 2019, at 3:12 PM, Doug Crompton via ARM-allstar <
> arm-allstar at hamvoip.org> wrote:
> >
> > Tom,
> >
> > I assume you mean that you have the bar graph for level setting on RX
> > audio but nothing on transmit. Here is the reason. On RX it is the audio
> > which is digitized into the network so it is important for the level to
> be
> > correct and also it is a known level. You want it to fill the digital
> > amplitude limit but never over that limit. Lets say 90% of the limit.
> For
> > the TX level being that it goes to an unknown local transmitter  a level
> > meter would be meaningless since the attenuation/gain and TX level
> > requirements AFTER the meter would be unknown. The only way to accurately
> > set TX level is with a deviation meter or station monitor tuned to your
> > transmit frequency. Since most would not have either of these available a
> > good way to set the TX level is to listen to a local repeaters level and
> > without changing the volume on your radio switch to your node frequency.
> > The levels should match and there should be no distortion. For a simplex
> > node this is usually more than adequate.
> >
> >
> > *73 Doug*
> >
> > *WA3DSP*
> >
> > *http://www.crompton.com/hamradio <http://www.crompton.com/hamradio>*
> >
> > On Sun, Aug 4, 2019 at 3:01 PM "Tom Eaton via ARM-allstar" <
> > arm-allstar at hamvoip.org> wrote:
> >
> >> In simple USB we can see the receive audio as a reference is there a
> way to
> >> see transmit audio in the same manner and if not could that be
> implemented.
> >>
> >> Tom, KC4CBQ
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