This relay-switched LPF board kit can have up to five additional LPF's plugged in, permitting the Ultimate3 and Ultimate3S QRSS/WSPR kits to sequence between 6 bands (including the LPF on the main U3/U3S board). The board size is 80 x 37mm, the same as the U3, so the boards stack together using four 25mm hex spacers. The plug-in LPF modules are available separately, click here.
The kit can also be used with your homebrew radio projects!
CLICK HERE to download the assembly instruction manual for PCB Revision 2 (the PCB has a "Rev 2" label printed on the right hand side).
CLICK HERE to download the assembly instruction manual for kits shipped from 07-Feb-2014 onwards.
CLICK HERE to download the assembly instruction manual for kits shipped prior to 07-Feb-2014.
The photos show the relay-switched LPF board plugged into the back of the U3 kit. Note that my photos below show NO additional LPF's plugged in (as I only had one built LPF at the time of those photos).