![]() ARRL Lab Impedance and SWR measurements with AA-30.ZERO and AntScope Software Load Freq. Dimensions (height, width, depth): inches (board only, not including Arduino) weight: 3 oz. Power requirements: USB powered, 5 V dc at 150 ma maximum. Communication interface: Serial TTL at 38,400 bauds. Harmonic and spurious suppression: Not specifi ed. Reference impedance for SWR measurement: As specified. RigExpert has a tutorial on their website show- Table 2 RigExpert AA-30.ZERO Manufacturer s Specifications Measured in the ARRL Lab Frequency range: MHz. The serial module provides both power to the board and the serial transmit/receive signals needed to operate the AA-30.ZERO. I bought a TTL UART serial converter module on ebay for about $5. The other option is to stack it directly onto an Arduino microcontroller using pins on the PC board. One is to connect it to a TTL serial USB interface, which can then be plugged into a PC. 48 AugustĢ There are two options for using the AA-30.ZERO. In my case, I chose to use stackable headers so that additional boards can be stacked on top of it (see Figure 4). The AA-30.ZERO board arrives assembled and tested in a sealed anti-static bag along with a set of pins suitable for interfacing with an Arduino UNO or MEGA 2560 microcontroller. It can be used with a percan be used in a number of ways by the ham radio experimenter. The user must supply a case and user interface of some sort. The device is basically a RigExpert AA-30 analyzer, but without the enclosure, display, and keypad. The RigExpert AA-30.ZERO is a fully functional vector impedance analyzer for 0.6 to 30 MHz on a compact printed circuit board. ZERO is very affordably priced and Bottom Line The AA-30.ZERO board offers experimenters a way to build and customize an accurate and useful antenna analyzer for the HF bands. 1 RigExpert AA-30.ZERO Antenna Analyzer Board Reviewed by Dave Cook, WAØTTN sonal computer or can be piggybacked directly onto an Arduino microcontroller board.
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