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The PCGM (Programmable Clock Generator Module) is a device used for some configurations<br>of simulcast with the RTCM. For transmitters that can "swallow" a 10 MHz external reference clock source<br>(such as the Motorola Quantar, etc), all you need is the output of the RTCM driving the direct <br>modulation of the transmitter. For radios that do not have an external reference clock source<br>(or have one, but not at 10MHz), the PCGM will take the 10Mhz reference from the GPSDO (generally<br>a Trimble Thunderbolt) and "make" whatever frequency your transmitter needs for a reference<br>(at least one of 17988 frequencies possible). Transmitters that do not have an external reference<br>clock input at all generally need to be modified to disconnect the normal internal reference oscillator<br>and make provisions to allow injection of the reference clock frequency from the PCGM. <br><br>In addition the PCGM also generates the voltages (3 of them, I believe) to run the Trimble<br>Thunderbolt, with a single (generally 12 volt) input to the PCGM.<br><br>These devices are available for sale from the Micro-Node.Com site.<br><br>There was also a question on the list about the ClockSynth project. This was merely an initial prototype<br>to prove the base design of the PCGM. There were only 2 boards of this type built. They worked and<br>demonstrated the validity of the general concept from which the PCGM was then based.<br><br>Jim WB6NIL<br><br><br><div><div id="SkyDrivePlaceholder"></div><hr id="stopSpelling">Date: Sun, 20 May 2012 20:16:34 -0700<br>From: baldwin88@yahoo.com<br>To: app_rpt-users@ohnosec.org<br>Subject: [App_rpt-users] What is a PGCM<br><br><table border="0" cellpadding="0" cellspacing="0"><tbody><tr><td style="font:inherit" valign="top"><div>Had a friend who went to Dayton and he saw the Micro Node people with a unit called a PGCM....what is it and what can it do???</div>
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<div>Frank</div></td></tr></tbody></table><br>_______________________________________________
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