Here is another pretty clean LPF board .....I just sent the Gerber off, boards in a week.
- Uses 60mil RF lines over a full Ground plane for some level of impedance control.
- Uses 6 sets of the same 12V relays as used on the uBITX
- All relays have bifurcated and redundant contacts and switch both ends of the LPFs, normally grounded
- SMA Coax connector options on either end of the board.
- Board measures 99mm x 83mm
- Control is via switching 1 of 6 lines to ground with a remotely located rotary switch, can use a micro controlled mux later on
- LPF sockets are set up for Hans' "QRP Labs" LPFs, or make your own, or use the parts off the uBITX to build your own.
- Symmetrical LPFs can be mounted right side up or upside down, just watch the orientation (Grounds).
- If you are using T37 toroids, upside down LPFs should be about as tall as the?relays and make a thin "sandwich".
- Gaps in the "top" wiring are continued as "jumpers" on the back of the board.
73 Kees K5BCQ
