[App_rpt-users] RTCM Simulcast question

[David McGough]

If you GPS-discipline that OCXO, I think it would be more than adequate.
Since you've already got the 1 PPS GPS signal, all that should be needed
in addition to the OCXO/Si5351 is a little $3 Arduino board (like:
http://www.ebay.com/itm/131702108124 ) to program the desired output
frequency(s) and perform compensation.

$16 for an OCXO ---NICE! ...The whole project maybe $25!



On Mon, 6 Jun 2016, Joe Moskalski wrote:

> I mentioned this to someone else, QRP Labs has a kit that creates a OCXO
> around the Si5351 chip. here is the link:
> 
> http://www.qrp-labs.com/ocxokit.html
> 
> If you couple this with another kit of theirs you can program it it any
> frequency you want. My only thought is would it be accurate/stable enough.
> 
> http://www.qrp-labs.com/progrock.html
> 
> 
> 
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> On Mon, Jun 6, 2016 at 11:36 AM, David McGough <kb4fxc at inttek.net> wrote:
> 
> >
> > Hi Joe,
> >
> > While on the subject of the Si5351 chips, the application of converting
> > one reference clock to a secondary frequency is what they were designed
> > for. So, since you've already got a GPS reference, this -might- be an
> > inexpensive starting point...For this application, you obviously won't
> > need all the bells and whistles presented in this article! See:
> >
> > http://www.knology.net/~gmarcus/Si5351/Si5351_VFO_QEX.pdf
> > http://www.knology.net/~gmarcus
> >
> > Note that I would replace the Si5351 25MHz reference with a decent TCXO
> > (available on ebay, etc.)....Note that I haven't used the Si5351 with an
> > RTCM, there may be simpler/better ways???
> >
> >
> > 73, David KB4FXC
> >
> >
> >
> >
> > On Mon, 6 Jun 2016, Joe Moskalski wrote:
> >
> > > > It seems clear that in order for simulcast to work properly with the
> > RTCM
> > > > I will need to clock the CPU to the GPSDO. Is there a device available
> > to
> > > > give you the 9.6 mhz reference from the 10 mhz out from the GPSDO or
> > does
> > > > anyone have a schematic available so that I can build them myself?
> > > >
> > > >
> > > <
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> >
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