[time-nuts] NavSync CW12 and CW25

[Pascal Nguyen]

Hi Ed

I build a 432.424MHz and 144.424MHz beacons for radio amateur application
based on CW25-TIM modules ($150 ea july-07).
I cannot provide any further details than the spec published by Navsync, due
to lack of measurement facility, my set up is simply a Rb standard and two
RT662 HF receivers driven with 5MHz source from Rb 10MHz/2) . Audio outputs
are directed to PC soundcard and water falls are visually compared, an entry
level for amateur like myself.
I etched the PC board for 3V3 SM power supply, backup battery, RS 232
converter (3v level) and 1PPS, NCO output, NMEA output, status LED
indicators.
My first board was populated with CW25 NAV, the only module available at
that time, max freq 10MHz NCO.
My second with CW25 TIM, max freq 30 MHz NCO
Control the NCO is quite simple, via simple protocols, ie 10MHz output is
such as " $PRTHS,FRQD,10.000.000 ".
The CW25 TIM, factory default NCO output is 10 MHz, since startup and will
lock to 1pps when status fixed, the module is running warm to touch at, I
suppose an ovenised crystal is inside.
I do not have the CW12, if the module is CW25TIM, it is worthy to get the
CW12 to save the pain of etching a PCB.


Pascal Nguyen

On 8/7/08, Ed Palmer <ed_palmer at sasktel.net> wrote:

> Has anyone worked with the NavSync CW12 GPS board or the CW25 module
> that its based on?  It's been mentioned a few times on this mailing
> list, but not really evaluated or discussed to death. :-)
>
> I'm looking for a new GPS board and this one looks quite interesting.
> It's main feature is a programmable 10 Hz to 10 MHz oscillator that's
> phase-locked to the 1 PPS output.  They're both available at the same
> time (on different pins).
>
> The user manual isn't online, but I asked them via email and got a copy
> with no problem.  The datasheets and product briefs are available at:
>
> Datasheets
> http://www.navsync.com/docs/CW12-TIM_DS_V1.pdf
> http://www.navsync.com/docs/CW25-TIM_DS_Rev_1.pdf
>
> Product Briefs
> http://www.navsync.com/docs/CW12_TIM.pdf
> http://www.navsync.com/docs/CW25_TIM.pdf
>
> I see that they're not suggesting that this little module is a
> full-blown GPSDO.  This app note talks about it.
>
> http://www.navsync.com/docs/AN03_GPS_Timing.pdf
>
> The prices are CW12 - $89, CW25 - $64
>
> I have no relationship to Navsync or any reseller.  I'm just a potential
> customer.
>
> Thanks,
> Ed
>
>
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