[App_rpt-users] What is a PGCM

Chris Perrine (KB2FAF) kb2faf at arrl.net
Thu May 24 12:16:26 EDT 2012


Very cool.  Just what I am looking for...although it doesn't look like 
the PCGM has made it on the web site for sale yet...at least I couldn't 
fine it.

Chris

KB2FAF






On 05/24/2012 10:59 AM, Jim Duuuude wrote:
> The PCGM (Programmable Clock Generator Module) is a device used for 
> some configurations
> of simulcast with the RTCM. For transmitters that can "swallow" a 10 
> MHz external reference clock source
> (such as the Motorola Quantar, etc), all you need is the output of the 
> RTCM driving the direct
> modulation of the transmitter. For radios that do not have an external 
> reference clock source
> (or have one, but not at 10MHz), the PCGM will take the 10Mhz 
> reference from the GPSDO (generally
> a Trimble Thunderbolt) and "make" whatever frequency your transmitter 
> needs for a reference
> (at least one of 17988 frequencies possible). Transmitters that do not 
> have an external reference
> clock input at all generally need to be modified to disconnect the 
> normal internal reference oscillator
> and make provisions to allow injection of the reference clock 
> frequency from the PCGM.
>
> In addition the PCGM also generates the voltages (3 of them, I 
> believe) to run the Trimble
> Thunderbolt, with a single (generally 12 volt) input to the PCGM.
>
> These devices are available for sale from the Micro-Node.Com site.
>
> There was also a question on the list about the ClockSynth project. 
> This was merely an initial prototype
> to prove the base design of the PCGM. There were only 2 boards of this 
> type built. They worked and
> demonstrated the validity of the general concept from which the PCGM 
> was then based.
>
> Jim WB6NIL
>
>
> ------------------------------------------------------------------------
> Date: Sun, 20 May 2012 20:16:34 -0700
> From: baldwin88 at yahoo.com
> To: app_rpt-users at ohnosec.org
> Subject: [App_rpt-users] What is a PGCM
>
> 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???
> Frank
>
>
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