How complicated is the kit; does it require special tools or test equipment to build or align and how long does it take to construct?
I’ve designed the Z90 and Z91 to be simple to build and not to require test equipment beyond a digital voltmeter and ohmmeter. Based on the time it has taken me to assemble prototype boards, and Dario’s experience as an independent prototype board assembler (see N5QVF Build page for his experience) I believe than an experienced kit builder should be able to assemble a Z91 in about 8 to 9 hours, and a Z90 in about 9 to 10 hours. This time is from opening the box until checkout completion. These estimates are likely on the generous side, as the board Dario assembled was not silk screened and solder masked, and he had an extra module to assemble that not required in the release version, as the DDS Daughter board will be provided as a wired and tested module. This removes an hour or so assembly time, as well as simplifying the construction. The Z90/91 have about 25 surface mount components and the rest through-hole parts. All the passive (resistors and capacitors) surface mount components
