<html><head><meta http-equiv="Content-Type" content="text/html charset=windows-1252"><base href="x-msg://458/"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">That's right, there is no txprelem setting for RTCM's. Pre-emphasis is done by setting txctcss which causes chan_voter to turn on DSP pre-emphasis and setting txctcsslevel=0 forces no tone. So yeah, it's sort of a fake out. <div><br></div><div>Chan_usbradio txprelim will generate pre-emphasis when using a DMK URI or any other USB audio FOB. The preemp is none in chan_usbradio not in the USB FOB.</div><div><br></div><div>That's true, chan_voter and voter.conf is the interface to RTCM's even if not voting.</div><div><br><div><div>
<span class="Apple-style-span" style="border-collapse: separate; border-spacing: 0px; "><div>--</div><div>Tim</div><div>:wq</div></span>
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<br><div><div>On Aug 28, 2013, at 4:21 PM, KJ6KO <<a href="mailto:kj6ko@innercite.com">kj6ko@innercite.com</a>> wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div bgcolor="#ffffff" style="font-family: Helvetica; font-size: medium; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div><font size="2" face="Arial"></font> </div><div><font size="2" face="Arial"></font> </div><div><font size="2" face="Arial">AH! Besides answering another question I had about the "audio standard" on Asterisk being "line level" spkr/mic audio, you are sying the txprelim=yes is not what does it in a RTCM? Does that still need to be set?</font></div><div><font size="2" face="Arial"></font> </div><div><font size="2" face="Arial">Sounds like you are basically "fooling" it by telling it to generate a PL, which makes it think it is connected directly to a modulator, hence it will pre-emphasize the audio automatically? Setting the txctcsslevel=0 just kills the tone.</font></div><div><font size="2" face="Arial"></font> </div><div><font size="2" face="Arial">Do I have it correct now?</font></div><div><font size="2" face="Arial"></font> </div><div><font size="2" face="Arial">ALSO,</font></div><div><font size="2" face="Arial"> Since chan_simpleusb will not pre-emph, will a DMK URI do it if you use the chan_usbradio to drive it?</font></div><div><font size="2" face="Arial"></font> </div><div><font size="2" face="Arial">Lets see how many other questions I can cram in here.....</font></div><div><font size="2" face="Arial"></font> </div><div><font size="2" face="Arial"> I assume since I do not have an RTCM yet, that the chan_voter is what is used for the RTCM? Even if it is NOT being used as a voter system, just a radio interface?</font></div><div><font size="2" face="Arial"></font> </div><div><font size="2" face="Arial">Thakns for the help Tim!!</font></div><div><font size="2" face="Arial"></font> </div><div><font size="2" face="Arial">I'm learnin'</font></div><div><font size="2" face="Arial"></font> </div><div><font size="2" face="Arial">73 de Greg</font></div><blockquote style="border-left-color: rgb(0, 0, 0); border-left-width: 2px; border-left-style: solid; padding-left: 5px; padding-right: 0px; margin-left: 5px; margin-right: 0px; "><div style="font-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-family: arial; ">----- Original Message -----</div><div style="font-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-family: arial; background-color: rgb(228, 228, 228); "><b>From:</b><span class="Apple-converted-space"> </span><a title="tim.sawyer@me.com" href="mailto:tim.sawyer@me.com">Tim Sawyer</a></div><div style="font-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-family: arial; "><b>To:</b><span class="Apple-converted-space"> </span><a title="kj6ko@innercite.com" href="mailto:kj6ko@innercite.com">KJ6KO</a></div><div style="font-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-family: arial; "><b>Cc:</b><span class="Apple-converted-space"> </span><a title="App_rpt-users@ohnosec.org" href="mailto:App_rpt-users@ohnosec.org">App_rpt-users@ohnosec.org</a></div><div style="font-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-family: arial; "><b>Sent:</b><span class="Apple-converted-space"> </span>Wednesday, August 28, 2013 12:46 PM</div><div style="font-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-family: arial; "><b>Subject:</b><span class="Apple-converted-space"> </span>Re: [App_rpt-users] RTCM txprelim?</div><div><br></div>Sorry, this deserves a better expansion. Sometimes I get in a hurry.<div><br></div><div>Asterisk ships audio around (on the links, etc) as line-level audio (not pre-emphasized and needs no de-epmhasis). This works out great for telephones, computer clients, voice announcements, etc because Asterisk doesn't have to do any filtering. After all Asterisk is a telephone PBX where you would expect audio to be line-level (speaker/mic) audio. This leaves the pre/de-emphasis up to app_rpt channel drivers. Chan_usbradio and chan_voter can add pre-emphasis. Chan_simpleusb cannot pre-emphasise. <div><br></div><div>With chan_voter the DSP pre-emphasis is turned on by setting txctcss = xxx.x in voter.conf. If you want pre-emphasis but no TX P/L set txctcss = to some (any) tone and set txctcsslevel = 0.</div><div><br></div><div>Hope that helps.</div><div>--</div><div><div apple-content-edited="true"><span class="Apple-style-span" style="border-spacing: 0px; border-collapse: separate; "><span class="Apple-style-span" style="widows: 2; text-transform: none; text-indent: 0px; border-collapse: separate; font-style: normal; font-variant: normal; font-weight: normal; font-size: medium; line-height: normal; font-family: Verdana; white-space: normal; orphans: 2; letter-spacing: normal; word-spacing: 0px; border-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Tim<br>:wq</div></span></span></div><br><div><div>On Aug 28, 2013, at 10:26 AM, Tim Sawyer <<a href="mailto:tim.sawyer@me.com">tim.sawyer@me.com</a>> wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><base href="x-msg://33/"><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Absolutely, yes. That is it's normal mode. <br><div><span class="Apple-style-span" style="widows: 2; text-transform: none; text-indent: 0px; border-spacing: 0px; border-collapse: separate; font-style: normal; font-variant: normal; font-weight: normal; font-size: medium; line-height: normal; font-family: Verdana; white-space: normal; orphans: 2; letter-spacing: normal; word-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><span class="Apple-style-span" style="widows: 2; text-transform: none; text-indent: 0px; border-spacing: 0px; border-collapse: separate; font-style: normal; font-variant: normal; font-weight: normal; font-size: medium; line-height: normal; font-family: Verdana; white-space: normal; orphans: 2; letter-spacing: normal; word-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">--<br>Tim<br>:wq</div></span></span></div><br><div><div>On Aug 28, 2013, at 9:42 AM, KJ6KO <<a href="mailto:kj6ko@innercite.com">kj6ko@innercite.com</a>> wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div bgcolor="#ffffff" style="widows: 2; text-transform: none; text-indent: 0px; font-style: normal; font-variant: normal; font-weight: normal; font-size: medium; line-height: normal; font-family: Verdana; white-space: normal; orphans: 2; letter-spacing: normal; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><div><font size="2" face="Arial">I am looking into an RTCM. Does it have the capability of driving a modulator directly? May have to use it with an old Palomar controller which is set up for direct modulator input style TX audio (pre-emphasized)</font></div><div><font size="2" face="Arial"></font> </div><div><font size="2" face="Arial">txprelim=yes?</font></div><div><font size="2" face="Arial"></font> </div><div><font size="2" face="Arial">I know it has the ability to de-emphasize the DISC audio from the Palomar.</font></div><div><font size="2" face="Arial"></font> </div><div><font size="2" face="Arial">Thanks..</font></div><br><br>__________ Information from ESET NOD32 Antivirus, version of virus signature database 8738 (20130828) __________<br></div></blockquote></div></div></blockquote></div><br></div></div><br><br>__________ Information from ESET NOD32 Antivirus, version of virus signature database 8739 (20130828) __________<br><br>The message was checked by ESET NOD32 Antivirus.<br><br><a href="http://www.eset.com">http://www.eset.com</a></blockquote></div></blockquote></div><br></div></div></body></html>