----- Original Message -----
Sent: Friday, August 29, 2014 5:56
PM
Subject: Re: [App_rpt-users] audio
level
I wouldn't use the mic input on the M2 backplane.
Using
a URI, I run it through the op amp in the URI, and then directly to the
exciter audio input.
On the direct FM exciter (the so called PLL
exciter) I've measured the CG input is dead flat from 50 cycles or so to at
least 8KC. No pre-emphasis at all. This is where they injected the EDACS voice
data. A perfect place to inject TX audio. Just remember to set
the URI to TXPRELIM=YES. I don't think SIMPLEUSB will do that will
it? Don't you have to use USBRADIO to do that?
As to
levels......
It's generally been my habit, from my two way radio service
days, to set the exciter to hard limit everything at 5 KC. Then set the
transfer audio so that a signal on the input modulated, to 3 KC modulates the
transmitter to 4 KC. Takes advantage of the limiter to make up a bit of mod
density. With Allstar do this with the txvoice set command.
--
Sent from my Android phone with K-9 Mail.
Please excuse my brevity and
typing errors.
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