<div dir="ltr">The RTCM and simulcast DOES work. As mentioned before, you have to be using a transmitter that can accept a 10 mHz (or whatever) reference signal. You also need 1 PPS for your receivers and transmitter. You also need to sync the RTCM to your GPSDO (which I have not done). If you have not done all this you WILL hear some "funk" in the overlap areas. <div><br></div><div>That "funk" can go from usable to un-usable depending on how strong the transmitters are in the overlap region. </div><div><br></div><div>Pardon the "non-technical" terms. It does work but the law of physics do apply here.</div><div><br></div><div>de K0JSC</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Jun 6, 2016 at 9:54 AM, <span dir="ltr"><<a href="mailto:app_rpt-users-request@ohnosec.org" target="_blank">app_rpt-users-request@ohnosec.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Send App_rpt-users mailing list submissions to<br>
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Today's Topics:<br>
<br>
1. Re: audio for direct VCO FM (Joe Leikhim) (Steve Wright)<br>
2. Re: RTCM Simulcast question (Steve Wright)<br>
3. Re: audio for direct VCO FM: Si5351B (David McGough)<br>
4. Re: RTCM Simulcast question (Joe Moskalski)<br>
5. Re: RTCM Simulcast question (David McGough)<br>
6. Re: RTCM Simulcast question (Joe Moskalski)<br>
<br>
<br>
----------------------------------------------------------------------<br>
<br>
Message: 1<br>
Date: Mon, 6 Jun 2016 19:40:50 +1200<br>
From: Steve Wright <<a href="mailto:info@meshnetworks.co.nz">info@meshnetworks.co.nz</a>><br>
To: <a href="mailto:app_rpt-users@ohnosec.org">app_rpt-users@ohnosec.org</a><br>
Subject: Re: [App_rpt-users] audio for direct VCO FM (Joe Leikhim)<br>
Message-ID: <<a href="mailto:57552902.9070008@meshnetworks.co.nz">57552902.9070008@meshnetworks.co.nz</a>><br>
Content-Type: text/plain; charset=windows-1252; format=flowed<br>
<br>
On 04/06/16 04:00, Joe Leikhim <<a href="mailto:rhyolite@leikhim.com">rhyolite@leikhim.com</a>> wrote:<br>
> Assuming the VCO is part of a PLL, the PLL will tend to "correct" the<br>
> modulation, [....]<br>
<br>
Was planning to use the Si5351B - has VCO input.<br>
<br>
S<br>
<br>
<br>
<br>
------------------------------<br>
<br>
Message: 2<br>
Date: Mon, 6 Jun 2016 20:22:36 +1200<br>
From: Steve Wright <<a href="mailto:info@meshnetworks.co.nz">info@meshnetworks.co.nz</a>><br>
To: <a href="mailto:app_rpt-users@ohnosec.org">app_rpt-users@ohnosec.org</a><br>
Subject: Re: [App_rpt-users] RTCM Simulcast question<br>
Message-ID: <<a href="mailto:575532CC.2020304@meshnetworks.co.nz">575532CC.2020304@meshnetworks.co.nz</a>><br>
Content-Type: text/plain; charset=windows-1252; format=flowed<br>
<br>
On Sat, Jun 4, 2016 at 6:03 PM, Joe Moskalski <<a href="mailto:kc2irv@gmail.com">kc2irv@gmail.com</a>> wrote:<br>
<br>
> I will be setting up a 2 site UHF simulcast system in the coming months<br>
<br>
Huh? I was told (on this list) that simulcast TX "doesn't work".<br>
<br>
<br>
<br>
S<br>
<br>
<br>
<br>
------------------------------<br>
<br>
Message: 3<br>
Date: Mon, 6 Jun 2016 10:46:38 -0400 (EDT)<br>
From: David McGough <<a href="mailto:kb4fxc@inttek.net">kb4fxc@inttek.net</a>><br>
To: <a href="mailto:app_rpt-users@ohnosec.org">app_rpt-users@ohnosec.org</a><br>
Subject: Re: [App_rpt-users] audio for direct VCO FM: Si5351B<br>
Message-ID:<br>
<<a href="mailto:Pine.LNX.4.44.1606060946450.4196-100000@goliath.inttek.net">Pine.LNX.4.44.1606060946450.4196-100000@goliath.inttek.net</a>><br>
Content-Type: TEXT/PLAIN; charset=US-ASCII<br>
<br>
<br>
Hi Steve,<br>
<br>
We're getting way off topic for the mailing list, but, I thought I'd post<br>
this reply here if there are any other interested hams out there, perhaps<br>
who are also experimenting in this area.<br>
<br>
I haven't played with the Si5351B version of this interesting chip, yet. I<br>
wonder whether the voltage control input of this chip would be suitable<br>
for AF FM modulation? Assuming that you could modulate the VCXO at audio<br>
frequencies (the datasheet isn't completely clear to me about that), an<br>
immediate issue would be that everytime you change the fractional-N<br>
division ratio, you'll change the modulation index. This will have to be<br>
compensated for, one way or another.<br>
<br>
I've been playing with several boards with Si5351 chips. They're pretty<br>
neat. They're also pretty noisy! ...With both spurious and phase noise.<br>
The phase noise can be improved somewhat with a better external crystal<br>
oscillator, the spurs seem more challenging. Using the on-board VCXO with<br>
the 5351B, you can't use a high quality external oscillator, so phase<br>
noise and overall frequency stability could be an issue, too.<br>
<br>
Anyhow, for my applications, I'm following the Si5351 with a secondary<br>
clean-up VCO/PLL, which was already in the radios. I just needed a<br>
frequency-agile reference oscillator, so to speak. I think the Si5351 will<br>
work well for this, based on my preliminary tests! (I'd certainly like to<br>
hear the experiences from anyone who has already been down this road!)<br>
<br>
I guess you're not finding any local sources of surplus radios? Do you<br>
have any 6m power amps available?<br>
<br>
<br>
73, David KB4FXC<br>
<br>
<br>
<br>
On Mon, 6 Jun 2016, Steve Wright wrote:<br>
<br>
> On 04/06/16 04:00, Joe Leikhim <<a href="mailto:rhyolite@leikhim.com">rhyolite@leikhim.com</a>> wrote:<br>
> > Assuming the VCO is part of a PLL, the PLL will tend to "correct" the<br>
> > modulation, [....]<br>
><br>
> Was planning to use the Si5351B - has VCO input.<br>
><br>
> S<br>
><br>
<br>
<br>
<br>
------------------------------<br>
<br>
Message: 4<br>
Date: Mon, 6 Jun 2016 11:03:11 -0400<br>
From: Joe Moskalski <<a href="mailto:kc2irv@gmail.com">kc2irv@gmail.com</a>><br>
To: <a href="mailto:App_rpt-users@ohnosec.org">App_rpt-users@ohnosec.org</a><br>
Subject: Re: [App_rpt-users] RTCM Simulcast question<br>
Message-ID:<br>
<CAES28qxB06niu+nL4Y5QfUvgZFf-y8s=<a href="mailto:uZdH2afzxKnwr0HV%2Bw@mail.gmail.com">uZdH2afzxKnwr0HV+w@mail.gmail.com</a>><br>
Content-Type: text/plain; charset="utf-8"<br>
<br>
> It seems clear that in order for simulcast to work properly with the RTCM<br>
> I will need to clock the CPU to the GPSDO. Is there a device available to<br>
> give you the 9.6 mhz reference from the 10 mhz out from the GPSDO or does<br>
> anyone have a schematic available so that I can build them myself?<br>
><br>
><br>
<<a href="https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail&utm_term=icon" rel="noreferrer" target="_blank">https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail&utm_term=icon</a>><br>
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Message: 5<br>
Date: Mon, 6 Jun 2016 11:36:01 -0400 (EDT)<br>
From: David McGough <<a href="mailto:kb4fxc@inttek.net">kb4fxc@inttek.net</a>><br>
To: <a href="mailto:App_rpt-users@ohnosec.org">App_rpt-users@ohnosec.org</a><br>
Subject: Re: [App_rpt-users] RTCM Simulcast question<br>
Message-ID:<br>
<<a href="mailto:Pine.LNX.4.44.1606061122550.4196-100000@goliath.inttek.net">Pine.LNX.4.44.1606061122550.4196-100000@goliath.inttek.net</a>><br>
Content-Type: TEXT/PLAIN; charset=US-ASCII<br>
<br>
<br>
Hi Joe,<br>
<br>
While on the subject of the Si5351 chips, the application of converting<br>
one reference clock to a secondary frequency is what they were designed<br>
for. So, since you've already got a GPS reference, this -might- be an<br>
inexpensive starting point...For this application, you obviously won't<br>
need all the bells and whistles presented in this article! See:<br>
<br>
<a href="http://www.knology.net/~gmarcus/Si5351/Si5351_VFO_QEX.pdf" rel="noreferrer" target="_blank">http://www.knology.net/~gmarcus/Si5351/Si5351_VFO_QEX.pdf</a><br>
<a href="http://www.knology.net/~gmarcus" rel="noreferrer" target="_blank">http://www.knology.net/~gmarcus</a><br>
<br>
Note that I would replace the Si5351 25MHz reference with a decent TCXO<br>
(available on ebay, etc.)....Note that I haven't used the Si5351 with an<br>
RTCM, there may be simpler/better ways???<br>
<br>
<br>
73, David KB4FXC<br>
<br>
<br>
<br>
<br>
On Mon, 6 Jun 2016, Joe Moskalski wrote:<br>
<br>
> > It seems clear that in order for simulcast to work properly with the RTCM<br>
> > I will need to clock the CPU to the GPSDO. Is there a device available to<br>
> > give you the 9.6 mhz reference from the 10 mhz out from the GPSDO or does<br>
> > anyone have a schematic available so that I can build them myself?<br>
> ><br>
> ><br>
> <<a href="https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail&utm_term=icon" rel="noreferrer" target="_blank">https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail&utm_term=icon</a>><br>
> Virus-free.<br>
> <a href="http://www.avast.com" rel="noreferrer" target="_blank">www.avast.com</a><br>
> <<a href="https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail&utm_term=link" rel="noreferrer" target="_blank">https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail&utm_term=link</a>><br>
> <#DDB4FAA8-2DD7-40BB-A1B8-4E2AA1F9FDF2><br>
><br>
<br>
<br>
<br>
------------------------------<br>
<br>
Message: 6<br>
Date: Mon, 6 Jun 2016 11:54:11 -0400<br>
From: Joe Moskalski <<a href="mailto:kc2irv@gmail.com">kc2irv@gmail.com</a>><br>
To: David McGough <<a href="mailto:kb4fxc@inttek.net">kb4fxc@inttek.net</a>><br>
Cc: <a href="mailto:App_rpt-users@ohnosec.org">App_rpt-users@ohnosec.org</a><br>
Subject: Re: [App_rpt-users] RTCM Simulcast question<br>
Message-ID:<br>
<<a href="mailto:CAES28qx-G3wytTXKMRVvzMNm%2B498_c-aeNB6JrTWmZOR7A7ZcA@mail.gmail.com">CAES28qx-G3wytTXKMRVvzMNm+498_c-aeNB6JrTWmZOR7A7ZcA@mail.gmail.com</a>><br>
Content-Type: text/plain; charset="utf-8"<br>
<br>
I mentioned this to someone else, QRP Labs has a kit that creates a OCXO<br>
around the Si5351 chip. here is the link:<br>
<br>
<a href="http://www.qrp-labs.com/ocxokit.html" rel="noreferrer" target="_blank">http://www.qrp-labs.com/ocxokit.html</a><br>
<br>
If you couple this with another kit of theirs you can program it it any<br>
frequency you want. My only thought is would it be accurate/stable enough.<br>
<br>
<a href="http://www.qrp-labs.com/progrock.html" rel="noreferrer" target="_blank">http://www.qrp-labs.com/progrock.html</a><br>
<br>
<br>
<br>
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<br>
On Mon, Jun 6, 2016 at 11:36 AM, David McGough <<a href="mailto:kb4fxc@inttek.net">kb4fxc@inttek.net</a>> wrote:<br>
<br>
><br>
> Hi Joe,<br>
><br>
> While on the subject of the Si5351 chips, the application of converting<br>
> one reference clock to a secondary frequency is what they were designed<br>
> for. So, since you've already got a GPS reference, this -might- be an<br>
> inexpensive starting point...For this application, you obviously won't<br>
> need all the bells and whistles presented in this article! See:<br>
><br>
> <a href="http://www.knology.net/~gmarcus/Si5351/Si5351_VFO_QEX.pdf" rel="noreferrer" target="_blank">http://www.knology.net/~gmarcus/Si5351/Si5351_VFO_QEX.pdf</a><br>
> <a href="http://www.knology.net/~gmarcus" rel="noreferrer" target="_blank">http://www.knology.net/~gmarcus</a><br>
><br>
> Note that I would replace the Si5351 25MHz reference with a decent TCXO<br>
> (available on ebay, etc.)....Note that I haven't used the Si5351 with an<br>
> RTCM, there may be simpler/better ways???<br>
><br>
><br>
> 73, David KB4FXC<br>
><br>
><br>
><br>
><br>
> On Mon, 6 Jun 2016, Joe Moskalski wrote:<br>
><br>
> > > It seems clear that in order for simulcast to work properly with the<br>
> RTCM<br>
> > > I will need to clock the CPU to the GPSDO. Is there a device available<br>
> to<br>
> > > give you the 9.6 mhz reference from the 10 mhz out from the GPSDO or<br>
> does<br>
> > > anyone have a schematic available so that I can build them myself?<br>
> > ><br>
> > ><br>
> > <<br>
> <a href="https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail&utm_term=icon" rel="noreferrer" target="_blank">https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail&utm_term=icon</a><br>
> ><br>
> > Virus-free.<br>
> > <a href="http://www.avast.com" rel="noreferrer" target="_blank">www.avast.com</a><br>
> > <<br>
> <a href="https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail&utm_term=link" rel="noreferrer" target="_blank">https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail&utm_term=link</a><br>
> ><br>
> > <#DDB4FAA8-2DD7-40BB-A1B8-4E2AA1F9FDF2><br>
> ><br>
><br>
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</blockquote></div><br></div>