<div dir="ltr"><br><div class="gmail_quote"><div>Hi Tim, </div><div dir="auto"><br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div class="gmail_default">>f you are using discriminator audio you don't have to set deemp=yes in voter.conf because 13 - COR type = 0 (normal) will switch in the RTCM's filter. With 13 - COR type = 1 >>(Ignore) the filter is not switched in.</div></div></blockquote><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div class="gmail_default"><br></div><div class="gmail_default">>You can use COR type 0 in non-voting applications if you want to use the RTCM's squelch circuit which is quite good and MICOR quality. This has 2 advantages. You'll be able to >see the RTCM's RSSI rather than just 0 and 255. Second, you can use turn the P/L on and off as the only output PIN isn't 'anded' COR and PL. In this case you likely will need to >set deemp=yes in voter.conf. </div></div></blockquote><div><br></div><div> I didn't know either of those things! Very good to know. </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div class="gmail_default"><br></div><div class="gmail_default">Transmit audio is not pre-emphasize unless you have CTCSS enabled. If you need pre-emphasis but no tone you can set a freq with 0 level. </div></div></blockquote><div><br></div><div>Yep! That's what I was eluding to in examples 1 and 4 of my original post. </div><div><br></div><div>Thanks for the 411, it's much appreciated as always. </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div class="gmail_default"><br></div></div><div class="gmail_extra"></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Jan 23, 2018 at 12:04 PM, Sam Skolfield <span><<a href="mailto:kj6qfs@gmail.com" target="_blank">kj6qfs@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div dir="auto">Hi Jessie. </div><div dir="auto">Yes, for voting and/or simulcasting, you obviously need to provide raw discriminator audio and modulator audio. </div><div dir="auto"><br></div><div dir="auto">This is will be a non-voted repeater. </div><div><div class="m_3357497326195638586m_-2544463704836133137h5"><br><div class="gmail_quote"><div>On Tue, Jan 23, 2018 at 7:41 AM Jesse Lloyd <<a href="mailto:ve7lyd@gmail.com" target="_blank">ve7lyd@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Well, if you want it to vote it'll have to be discriminator rx audio. If not, I'll use which ever squelch I deem to be superior. The motorola 2 level squelches are typically pretty good, but you have to open the lid on a GM300 to adjust it. If that's ok, then I'd use that.<br>
<br>
For pre-emph, if you want simulcast with PL you have to let the voter make the PL tone. Otherwise I prefer using the mic in as it has nice a nice audio filter response and limiter circuit. Just a note for the GM300 you should adjust the max deviation when programming them into the ham band. The UHF ones I find change quite a bit with frequency. Sometimes you'll also have to make an adjustment to the PLL reference voltage to get it to lock up for Tx.<br>
<br>
Cheers,<br>
Jesse<br>
<br>
> On Jan 23, 2018, at 3:32 AM, Sam Skolfield <<a href="mailto:kj6qfs@gmail.com" target="_blank">kj6qfs@gmail.com</a>> wrote:<br>
><br>
> Greetings,<br>
> I've been playing with RTCMs and VOTER boards for almost 5 years now, and I'm very happy with what I have in service. I've built a multi-site voted system, and more recently a non-voted hub that ties together repeater controllers at a few sites.<br>
><br>
> I'm helping a friend but together a RTCM / pair of GM300 repeater, and got to thinking about audio options. There is more than one right way!<br>
><br>
> 1. Discriminator audio to RTCM, set deemp=yes in voter.conf (causes hardware de-emphasis in RTCM circuitry)<br>
> RTCM TX audio to GM300 Flat audio input, use chan_voter software preemphasis by specifying txctcss and txctcsslevel=0 in rpt.conf<br>
><br>
> 2. 1. Discriminator audio to RTCM, set deemp=yes in voter.conf (causes hardware de-emphasis in RTCM circuitry)<br>
> RTCM TX audio to mic audio, letting radio do pre-emphasis.<br>
><br>
><br>
> 3. 1.De-emphased audio from GM300 (JU551 set to B) RTCM<br>
> RTCM TX audio to mic audio, letting radio do pre-emphasis.<br>
><br>
> 4. 1.De-emphased audio from GM300 (JU551 set to B) RTCM<br>
> RTCM TX audio to Flat audio input, use chan_voter software preemphasis by specifying txctcss and txctcsslevel=0 in rpt.conf<br>
><br>
><br>
> All four of these combinations should theoretically produce "flat" system response, but I'm sure all four yield slightly different results, given different corner frequencies in hardware/software de-emphasis / pre-emphasis and different input/output impedance combinations.<br>
><br>
> Has anyone experimented with these combinations?<br>
><br>
> 73<br>
> --<br>
> KJ6QFS<br>
> Sam Skolfield<br>
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