I managed to find time to build Hans G0UPL’s latest kit yesterday morning and am happy with the results of today’s initial testing.
Assembly time of the main kit plus one low pass filter (for 30m) took a bit over 2-1/2 hours. The parts assembly aspect of the kit consists of two small boards – the main circuit board and the filter for band of choice. After these are completed, two other boards (DDS VFO and digital display), both of which are pre-assembled, plug into the main board.
Hans cautions against using a power supply greater than 5 volts so I searched high and low for a 5V wall wart without success. I ended up using 4 NiMH AA batteries at 5.2 volts. Alkaline AA’s in this configuration would probably be too high but the lower per-cell voltage of the NiMH’s is perfect.
This little gadget is very versatile in terms of the many modes it offers. My initial tests were in plain vanilla CW and just scrolling through the menu items to configure mode, frequency and other parameters. All went well as I monitored my transmitted signal on the K3.
In addition to the basic kit, I also have another low pass filter (for 40m) to build and have to attach the GPS receiver (also ordered) to the Ultimate III.
For WSPR operation, maidenhead grid is derived from the GPS receiver’s coordinates. Additionally, the GPS signal serves to calibrate the frequency of the kit and does away with the need to perform a manual calibration.