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TADD-2 PPS Divider

The TADD-2 is a divider that accepts a 5 or 10 MHz input signal and generates output frequencies in decade steps from 1 pulse-per-second ("PPS") to 10K PPS.

The pulse train can be synchronized to an external source (such as a GPS receiver).

The TADD-2 has six low-impedance outputs that deliver greater than 3.5 volts into a 50 ohm load, with rise time at the connector of less than 3ns.

The pulse rate of each output can be individually set, along with the output polarity. A wide-range input circuit accepts signal levels as low as -10 dBm. The input can be terminated in 50 ohms or a high impedance load.

The 12 volt power input is fused and protected against reverse polarity. Current drain depends on the number of loads and ranges from 70 to 250ma.

The TADD-2 uses a PIC chip as the divider. The PIC runs code written by Tom Van Baak and modified by Richard McCorkle. The TADD-2 comes with a programmed PIC, and the source code is available as Open Source Software for those who would like to experiment with it.

Source code is here.

Ordering Information

The price for the TADD-2 is:

  • $ 71 US for members of TAPR

  • $ 79 US for non-members

    + shipping/handling if applicable.
(Place Web Order)

A note regarding email addresses: When checking out please use an email address other than @earthlink.net, @hotmail.com, @live.com, @msn.com, @outlook.com. For some reason these domains reject email from tapr.org

Shipping and Handling

Shipping and Handling within the US will be by USPS Priority Mail.

International shipping costs are calculated as closely as possible. If the actual cost exceeds the estimate by more than $10.00, TAPR will contact you to get approval for the additional funds. TAPR uses insured Priority Mail International, unless the purchaser requires something else.

Assembly and Operations Manual

The assembly and operations manual can be found online at http://www.tapr.org/~n8ur/TADD-2_Manual.pdf.


TAPR kits can be complex depending on the kitting experience of each builder. We don't think you will have trouble with the kit, but it does require some knowledge and experience to successfully go from a kit to a finished, usable unit, depending on the mode of operations.


The TAPR TADD-2 Kit was made possible by the efforts of:

John Ackermann, N8UR – Designer and Project Manager
Tom Van Baak – Software Author
Richard McCorkle – Software Author
Joe Borovetz, WA5VMS – Parts Liaison

Beta Testers:
Tom Van Baak
Richard McCorkle
Mike Suhar, W8RKO

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