When you are injecting into a part of the audio chain that does not require pre-emphasis, you might still want limiting.

In that case, you set

txlimonly=yes

At one time several people reported they were getting pretty horrible-sounding clipping when the URI was driven beyond full scale.

Subsequent to that I found the real problem was that when you use composite audio the software will happily attempt to generate a number bigger than 16 bits when you use gain settings for voice and tone that total >1000.  The restriction that these two numbers not add to more than 1000 (for composite audio) *is* documented and is the real solution to that issue.

However, it’s not inconceivable that somebody might want limiting without pre-emphasis, if the limiting in the radio was inadequate.

Ken

From: app_rpt-users-bounces@ohnosec.org [mailto:app_rpt-users-bounces@ohnosec.org] On Behalf Of Jim Duuuude
Sent: Tuesday, October 09, 2012 9:17 PM
To: w7ry@centurytel.net; app_rpt mailing list
Subject: Re: [App_rpt-users] USB Radio Commands

It is one of those 'it really has no good reason to ever be used' options, and I have no idea why someone wanted it,
but it was harmless and utterly trivial to add, so I did. It, along with a few others of those were never documented
to discourage their (quite questionable) use.

Jim WB6NIL

---

From: w7ry@centurytel.net
To: app_rpt-users@ohnosec.org
Date: Tue, 9 Oct 2012 18:05:25 -0700
Subject: [App_rpt-users] USB Radio Commands

So if this setting txprelim=no   is:

TX audio processing. Options: (no,yes). Choosing yes turns on transmitter

preemphasis and peak limiting, along with a lowpass filter. The yes option

is used when driving an FM transmitter directly by injecting audio right into

the modulator. The no option provides audio which should be injected into

the microphone input of the transmitter or at some point in the transmitter'

speech amplifier before preemphasis,

and limiting.

What is the setting?

txlimonly=no

Nothing in the manual about it.

Thanks 73

Jim W7RY

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