[time-nuts] Announcement: TAPR TADD-2 PPS Divider Board Now Available

Magnus Danielson magnus at rubidium.dyndns.org
Tue Apr 21 19:35:41 UTC 2009


John Ackermann N8UR skrev:
> The TADD-2 divider is now available for purchase from TAPR.
> The TADD-2 accepts a 5 or 10 MHz input signal and generates 1 PPS 
> outputs (as well as other pulse rates).  It has six low-impedance output 
> channels, each of which can be individually configured, and has a sync 
> circuit that allows the output pulse train to be synchronized to an 
> external source such as a GPS.
> Preliminary tests show a temperature sensitivity of about 50 ps/degree 
> C, and an RMS jitter level of <20 picoseconds.
> The divider is based on a Microchip PIC device, and the code was written 
> by Tom Van Baak and Richard McCorkle.  The source code is being released 
> as Open Source Software.
> The TADD-2 is sold as a kit.  It uses through-hole components so doesn't 
> require any special tools for assembly.  The TADD-2 is the same form 
> factor as the other TADD boards, and fits in the same enclosure (also 
> available from TAPR).
> The price is $69, or $62 for TAPR members.  Shipment should start in the 
> next two weeks.
> More information about the TADD-2 is available at 
> http://www.tapr.org/kits_tadd-2.html .  The assembly/instruction manual 
> (which is still very preliminary and incomplete) is at 
> http://www.tapr.org/~n8ur/TADD-2_Manual.pdf .
> In an earlier posting, I mentioned that I was also working on a 
> miniaturized, "dongle" version of the TADD-2.  That work continues, and 
> we hope to make the TADD-2 Mini available sometime this summer.  I'll 
> post an update when the details firm up.

Looks very interesting. Good work. I especially like the fact that it 
supports both 5 and 10 MHz in the form of a jumper and also that it has 
multiple frequency outputs but re-jumpable to get multiple PPS outputs 
for instance. Should be usefull for many things and cases.


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