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

John Ackermann N8UR jra at febo.com
Tue Apr 21 13:19:30 UTC 2009

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.


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