<html>
<head>
<meta content="text/html; charset=utf-8" http-equiv="Content-Type">
</head>
<body bgcolor="#FFFFFF" text="#000000">
<blockquote>
<div style="left: 440px; top: 903.733px; font-size: 16.6667px;
font-family: sans-serif; transform: scaleX(1.00986);">More on
this:<br>
<br>
Exciter <span class="highlight selected">Modulation </span>Signals
<br>
Digitized audio/data intended to be transmitted from the station
is output from the DSP circuitry to a D/A converter via the
TX/Voice Audio signal (p/o the Serial Synchronous Interface bus,
connected between the DSP and the DSP ASIC). The digitized
signal is converted to analog, level shifted and amplified, and
fed to a 0-6 kHz filter. The output of the filter is then fed to
one of the inputs of a multiplexer. The output of the
multiplexer is fed to two individual digitally controlled
potentiometers (each of which is adjusted by the Host uP via the
SPI Bus) and output to the Exciter Module as <span
class="highlight">modulation </span>signals VCO MOD AUDIO and
REF MOD AUDIO.</div>
</blockquote>
<br>
<div class="moz-cite-prefix">On 5/8/2017 5:26 PM, Joe Leikhim wrote:<br>
</div>
<blockquote
cite="mid:b085a295-9154-fce1-b58a-536d6c2832c5@leikhim.com"
type="cite">
<meta content="text/html; charset=utf-8" http-equiv="Content-Type">
<p>I think it is a bit more complicated than that. If you dither
the reference oscillator of a repeater, it will also have an
effect on the demodulated PL/DPL from the receiver. Some half
duplex transceivers indeed apply modulation compensation
directly to the reference oscillators, and others do not, but
employ alternative compensation techniques. <br>
</p>
This from a Quantar Manual<br>
<blockquote>
<div style="left: 380px; top: 344.533px; font-size: 16.6667px;
font-family: sans-serif; transform: scaleX(1.03797);" class="">Modulation
<br>
The active VCO receives an audio/data <span class="highlight
selected">modulation </span>signal from the Station
Control Module via two low-pass filters. This <span
class="highlight">modulation </span>signal modulates the
active VCO to produce a modulated low-level rf carrier signal.
<br>
<br>
Low-frequency <span class="highlight">modulation </span>signals
(below the loop filter corner) tend to be interpreted by the
PLL as VCO frequency error. A modulation compensation signal
is added to the PLL <u>control voltage</u> to cancel out this
effect and allow for low frequency modulation.</div>
</blockquote>
The trick I believe, is in the way the PL/DPL is presented to the
station and if the modulation compensation adjustment is
sufficient to track out the PLL's tendency to cancel the low
frequency tones.<br>
<br>
Joe Leikhim<br>
<br>
<br>
<div class="moz-cite-prefix">On 5/8/2017 4:33 PM, Bryan Fields
wrote:<br>
</div>
<blockquote
cite="mid:497E313D-B351-4A59-ACF7-D3485E6C38E6@bryanfields.net"
type="cite">
<meta http-equiv="content-type" content="text/html;
charset=utf-8">
<div>I've been following this with some interest. One of the
fundamental issues with the PCGM was the master clock going to
the radio was unable to be modulated. This made low frequency
signals (PL) distort, and digital PL was even worse. </div>
<div id="AppleMailSignature"><br>
</div>
<div id="AppleMailSignature">Typically most radios use two point
modulation, with modulation on the reference oscillator. When
you add an external reference you loose this.</div>
<div id="AppleMailSignature"><br>
</div>
<div id="AppleMailSignature">Some base stations are designed to
do two point modulation even on an external clock, the Quantar
for example. This station will even phase lock it's PL and
DPL generation if provided a 1 PPS in addition to a clock.</div>
<div id="AppleMailSignature"><br>
</div>
<div id="AppleMailSignature">If we could inject modulation into
the clock generator simulcast performance would vastly
improve. I'd be interested to see your design to see if this
would be a possibility.</div>
<div id="AppleMailSignature"><br>
</div>
<div id="AppleMailSignature">Thoughts?</div>
<div id="AppleMailSignature"><br>
<div style="direction: inherit;">--</div>
<div style="direction: inherit;">Bryan Fields</div>
<div style="direction: inherit;">M: +1-727-409-1194</div>
</div>
<div><br>
On May 8, 2017, at 14:15, Reid Brandon <<a
moz-do-not-send="true" href="mailto:rfpowerguy@yahoo.com">rfpowerguy@yahoo.com</a>>
wrote:<br>
<br>
</div>
<blockquote type="cite">
<div>
<div style="color:#000; background-color:#fff;
font-family:times new roman, new york, times,
serif;font-size:16px">
<div id="yui_3_16_0_ym19_1_1494266968989_5136">Hi Joe,</div>
<div id="yui_3_16_0_ym19_1_1494266968989_5135">I got a
page with a pic of a man that rotated around saying
DOWNLOAD NOT FOUND.</div>
<div id="yui_3_16_0_ym19_1_1494266968989_5184">Try again!?</div>
<div id="yui_3_16_0_ym19_1_1494266968989_5186">Tks Reid<br>
</div>
<div id="yui_3_16_0_ym19_1_1494266968989_5134"><span></span></div>
<div class="qtdSeparateBR"><br>
<br>
</div>
<div style="display: block;" class="yahoo_quoted">
<div style="font-family: times new roman, new york,
times, serif; font-size: 16px;">
<div style="font-family: HelveticaNeue, Helvetica
Neue, Helvetica, Arial, Lucida Grande, sans-serif;
font-size: 16px;">
<div dir="ltr"><font face="Arial" size="2"> On
Sunday, May 7, 2017 12:25 PM, Pierre Martel <<a
moz-do-not-send="true"
href="mailto:petem001@gmail.com">petem001@gmail.com</a>>
wrote:<br>
</font></div>
<br>
<br>
<div class="y_msg_container">
<div id="yiv9395446301">
<div>
<div dir="ltr">I am very interrested in all
this project. My email is VE2PF @ VE2MRC dot
com!
<div><br clear="none">
</div>
<div>what radio did you used for the
project? </div>
<div><br clear="none">
</div>
<div>Thanks for sharing!</div>
<div><br clear="none">
</div>
<div>Pierre</div>
<div>VE2PF</div>
<div><br clear="none">
</div>
</div>
<div class="yiv9395446301gmail_extra"><br
clear="none">
<div class="yiv9395446301yqt9077031820"
id="yiv9395446301yqtfd60759">
<div class="yiv9395446301gmail_quote">2017-05-07
12:32 GMT-04:00 Kevin Custer <span
dir="ltr"><<a
moz-do-not-send="true"
rel="nofollow" shape="rect"
ymailto="mailto:kuggie@kuggie.com"
target="_blank"
href="mailto:kuggie@kuggie.com">kuggie@kuggie.com</a>></span>:<br
clear="none">
<blockquote
class="yiv9395446301gmail_quote"
style="margin:0 0 0
.8ex;border-left:1px #ccc
solid;padding-left:1ex;">Joe,<br
clear="none">
<br clear="none">
Why not consider do it as an article
for Repeater Builder?<br clear="none">
<br clear="none">
Thanks,<br clear="none">
Kevin<span class="yiv9395446301im
yiv9395446301HOEnZb"><br
clear="none">
<br clear="none">
<br clear="none">
On 5/7/2017 3:13 AM, Joe Moskalski
wrote:<br clear="none">
</span>
<blockquote
class="yiv9395446301gmail_quote"
style="margin:0 0 0
.8ex;border-left:1px #ccc
solid;padding-left:1ex;"> I wanted
to throw this email out to the group
for all those who want to simulcast
with the RTCM. For those who don't
know, in order to make the RTCM
suitable for simulcast you must have
a more accurate 9.6 MHz clock for
the RTCM in order to ensure the
audio sounds acceptable in the
overlap areas. I did this a few
months ago using 9.6 MHz OCXO's.
This worked reasonably well. Not as
well as I would have liked but the
system was very usable, but of
course I wanted it to be better.
Since the PCGM (Programmable Clock
Generation Module) is no longer
available, I decided to roll my own
as some say.<br clear="none">
I created a PLL circuit that can
accept a 10 MHz, 1 MHz or 100 KHz
reference input and produce a phase
locked 9.6 MHz out for the RTCM. I
have been testing this over the past
few days and it has made an great
improvement in the audio quality in
the overlap. The quality of the
audio in the overlap areas sounds
very, very good, it's very similar
to what I expect to hear in
commercial simulcast systems. My
circuit is heavily based off of an
old Motorola MSF5000 HSO PLL circuit
that I was able to adapt and modify
to my needs. There are other uses
for this circuit that make it
attractive for simulcasting but I
wont get into them here. I am will
to share my schematic and bill of
materials (digikey) with anyone.
Please send me an email and I will
be willing to share all of my
information on the project.<br
clear="none">
</blockquote>
<br clear="none">
<div class="yiv9395446301HOEnZb">
<div class="yiv9395446301h5">
______________________________
_________________<br clear="none">
App_rpt-users mailing list<br
clear="none">
<a moz-do-not-send="true"
rel="nofollow" shape="rect"
ymailto="mailto:App_rpt-users@lists.allstarlink.org"
target="_blank"
href="mailto:App_rpt-users@lists.allstarlink.org">App_rpt-users@lists.allstarlin
k.org</a><br clear="none">
<a moz-do-not-send="true"
rel="nofollow" shape="rect"
target="_blank"
href="http://lists.allstarlink.org/cgi-bin/mailman/listinfo/app_rpt-users">http://lists.allstarlink.org/c
gi-bin/mailman/listinfo/app_rp
t-users</a><br clear="none">
<br clear="none">
To unsubscribe from this list
please visit <a
moz-do-not-send="true"
rel="nofollow" shape="rect"
target="_blank"
href="http://lists.allstarlink.org/cgi-bin/mailman/listinfo/app_rpt-users">http://lists.allstarlink.org/c
gi-bin/mailman/listinfo/app_rp
t-users</a> and scroll down to
the bottom of the page. Enter your
email address and press the
"Unsubscribe or edit options
button"<br clear="none">
You do not need a password to
unsubscribe, you can do it via
email confirmation. If you have
trouble unsubscribing, please send
a message to the list detailing
the problem. </div>
</div>
</blockquote>
</div>
<br clear="none">
</div>
</div>
</div>
</div>
<div class="yqt9077031820" id="yqtfd81137">_______________________________________________<br
clear="none">
App_rpt-users mailing list<br clear="none">
<a moz-do-not-send="true" shape="rect"
ymailto="mailto:App_rpt-users@lists.allstarlink.org"
href="mailto:App_rpt-users@lists.allstarlink.org">App_rpt-users@lists.allstarlink.org</a><br
clear="none">
<a moz-do-not-send="true" shape="rect"
href="http://lists.allstarlink.org/cgi-bin/mailman/listinfo/app_rpt-users"
target="_blank">http://lists.allstarlink.org/cgi-bin/mailman/listinfo/app_rpt-users</a><br
clear="none">
<br clear="none">
To unsubscribe from this list please visit <a
moz-do-not-send="true" shape="rect"
href="http://lists.allstarlink.org/cgi-bin/mailman/listinfo/app_rpt-users"
target="_blank">http://lists.allstarlink.org/cgi-bin/mailman/listinfo/app_rpt-users
</a>and scroll down to the bottom of the page.
Enter your email address and press the
"Unsubscribe or edit options button"<br
clear="none">
You do not need a password to unsubscribe, you
can do it via email confirmation. If you have
trouble unsubscribing, please send a message to
the list detailing the problem. </div>
<br>
<br>
</div>
</div>
</div>
</div>
</div>
</div>
</blockquote>
<blockquote type="cite">
<div><span>_______________________________________________</span><br>
<span>App_rpt-users mailing list</span><br>
<span><a moz-do-not-send="true"
href="mailto:App_rpt-users@lists.allstarlink.org">App_rpt-users@lists.allstarlink.org</a></span><br>
<span><a moz-do-not-send="true"
href="http://lists.allstarlink.org/cgi-bin/mailman/listinfo/app_rpt-users">http://lists.allstarlink.org/cgi-bin/mailman/listinfo/app_rpt-users</a></span><br>
<span></span><br>
<span>To unsubscribe from this list please visit <a
moz-do-not-send="true"
href="http://lists.allstarlink.org/cgi-bin/mailman/listinfo/app_rpt-users">http://lists.allstarlink.org/cgi-bin/mailman/listinfo/app_rpt-users</a>
and scroll down to the bottom of the page. Enter your
email address and press the "Unsubscribe or edit options
button"</span><br>
<span>You do not need a password to unsubscribe, you can do
it via email confirmation. If you have trouble
unsubscribing, please send a message to the list detailing
the problem. </span></div>
</blockquote>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<br>
<pre wrap="">_______________________________________________
App_rpt-users mailing list
<a moz-do-not-send="true" class="moz-txt-link-abbreviated" href="mailto:App_rpt-users@lists.allstarlink.org">App_rpt-users@lists.allstarlink.org</a>
<a moz-do-not-send="true" class="moz-txt-link-freetext" href="http://lists.allstarlink.org/cgi-bin/mailman/listinfo/app_rpt-users">http://lists.allstarlink.org/cgi-bin/mailman/listinfo/app_rpt-users</a>
To unsubscribe from this list please visit <a moz-do-not-send="true" class="moz-txt-link-freetext" href="http://lists.allstarlink.org/cgi-bin/mailman/listinfo/app_rpt-users">http://lists.allstarlink.org/cgi-bin/mailman/listinfo/app_rpt-users</a> and scroll down to the bottom of the page. Enter your email address and press the "Unsubscribe or edit options button"
You do not need a password to unsubscribe, you can do it via email confirmation. If you have trouble unsubscribing, please send a message to the list detailing the problem. </pre>
</blockquote>
<br>
<pre class="moz-signature" cols="72">--
Joe Leikhim
Leikhim and Associates
Communications Consultants
Oviedo, Florida
<a moz-do-not-send="true" class="moz-txt-link-abbreviated" href="mailto:JLeikhim@Leikhim.com">JLeikhim@Leikhim.com</a>
407-982-0446
<a moz-do-not-send="true" class="moz-txt-link-abbreviated" href="http://WWW.LEIKHIM.COM">WWW.LEIKHIM.COM</a></pre>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<br>
<pre wrap="">_______________________________________________
App_rpt-users mailing list
<a class="moz-txt-link-abbreviated" href="mailto:App_rpt-users@lists.allstarlink.org">App_rpt-users@lists.allstarlink.org</a>
<a class="moz-txt-link-freetext" href="http://lists.allstarlink.org/cgi-bin/mailman/listinfo/app_rpt-users">http://lists.allstarlink.org/cgi-bin/mailman/listinfo/app_rpt-users</a>
To unsubscribe from this list please visit <a class="moz-txt-link-freetext" href="http://lists.allstarlink.org/cgi-bin/mailman/listinfo/app_rpt-users">http://lists.allstarlink.org/cgi-bin/mailman/listinfo/app_rpt-users</a> and scroll down to the bottom of the page. Enter your email address and press the "Unsubscribe or edit options button"
You do not need a password to unsubscribe, you can do it via email confirmation. If you have trouble unsubscribing, please send a message to the list detailing the problem. </pre>
</blockquote>
<br>
<pre class="moz-signature" cols="72">--
Joe Leikhim
Leikhim and Associates
Communications Consultants
Oviedo, Florida
<a class="moz-txt-link-abbreviated" href="mailto:JLeikhim@Leikhim.com">JLeikhim@Leikhim.com</a>
407-982-0446
<a class="moz-txt-link-abbreviated" href="http://WWW.LEIKHIM.COM">WWW.LEIKHIM.COM</a></pre>
</body>
</html>