TASS System Multi-board RF Performance

The TASS switch system made a design compromise that means its RF performance has some variation depending on which combination of ports is selected. When using a port that’s not at the far end of the board from the common, there is a transmission line stub of varying length that affects VHF performance. A single TASS board works well through 150 MHz. The question has been what happens when you build a multi-board system? Now that I have the TASS […]

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TASS System enclosure

Several of the design projects I’ve done for TAPR were part of a larger concept I’ve been working on for several years: a measurement system that will allow me to compare the pulse-per-second (PPS) outputs from a bunch of test devices against one of several reference clocks over long time periods (sometimes a year or more). A key part of that system is a “multiplexer” or switch matrix that allows selecting one of several devices under test (DUT) and reference […]

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An interface from Hermes/ANAN to the TASS relay board

I didn’t even think of it when I was designing the TASS-R relay switch system, but the relay board can be used with an HPSDR Hermes, ANAN-10, or ANAN-100/200 radio without requiring use of an Arduino or other controller.  These radios provide 7 open collector outputs that can be programmed from within the PowerSDR software.  A simple interface board allows the TASS-R to be controlled by these outputs. The idea is that two of the outputs can be used as […]

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TASS Switching System announced, and fun with enclosures

Today TAPR announced availability of a project I’ve been working on for a while, a computer-controlled switch system called the TASS.  It consists of an 8-port relay bank that handles from DC to 150 MHz, a shield for an Arduino, and open source software for the Arduino. You can order the boards from http://tapr.org/kits_tass.html. I also designed an enclosure for a TASS board plus touchscreen controller, and had that built by Front Panel Express.  Here are some pictures of the […]

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