John,
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.
Cheers,
Magnus
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