It has a relatively large PCB ground plane that gives it excellent sensitivity! It is designed specifically for the QRP Labs kits. It's such a nice luxury, and for such a low price we really recommend it! The QLG1 kit is powered by 5V, includes proper logic level conversion to the 5V logic used in the U3S, and has onboard LEDs for visual status indication. But the GPS receiver sets the time and maintains precise timekeeping, sets location (and Maidenhead locator), calibrates the output frequency, and corrects temperature-induced frequency drift. The relay-switched LPF kit may be used to automatically switch between up to 6 different bands.Ī GPS receiver module such as the QLG1 kit can be used with the U3S kit. Changing bands is a matter of plugging in the appropriate low pass filter kit to attenuate unwanted harmonic output. Power output on 2m is lower than HF - 17mW was measured (with 5V PA and single BS170). The kit can transmit on any frequency from the amateur 2200m (137kHz) to 2m (145MHz) bands and even the 222MHz band. The Ultimate3S QRSS/WSPR transmitter kit includes an Si5351A synthesiser module kit and plug-in low pass filter modules which are also available separately for bands from 2200m to 6m. Much of the information in these earlier pages is still relevant and informative. Please also see the original version Ultimate QRSS kit and Ultimate2 QRSS kit pages, and the earlier U3 kit page to appreciate the heritage. The Si5351A frequency synthesiser kit was developed to ensure continued low cost of the Ultimate QRSS/WSPR kit series. The AD9850 DDS kit prices are rising and they are becoming less easily available.
The U3S uses an Si5351A frequency synthesiser kit rather than the pre-built AD9850 DDS kit used in the earlier U3 kit. It is the new edition of the earlier U3 kit produced from November 2013 to December 2014. The U3S kit was launched in January 2015. Plug-in LPF filters are available for all 16 HF/MF/LF/VHF bands from 2200m to 222MHz. It can produce QRSS, Hell, WSPR, Opera and PI4 slow-signal modes anywhere from 2200m to 2m and even 222MHz bands. The Ultimate3S QRSS/WSPR Transmitter Kit is the new edition of the third version in the "Ultimate" QRSS/WSPR kit trilogy.
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