KK1L 2x6 Antenna Switch
Relay Unit & Control/Band Decoder Unit
2 Radios to 6 Antennas
"I gotta build me one of them!"
Material on this page © Ronald D. Rossi, KK1L

Relay Unit Information
New High Isolation Relay Board Schematic (PDF) 22-DEC-2008 Click image above to view 12V activated relays with 50Ohm termination for unused antennas to reduce reradiation and unwanted internal coupling.	New High Isolation Relay PC Board Layout (PDF) 22-DEC-2008 Click image above to view High quality FR4 double sided 2oz copper, masked, and silk screened both sides. Available for purchase. Email for availability. Basic construction information Chassis Drill Template - mirrored Chassis Drill Template - standard

Control / Band Decoder Unit Information
Controller / Dual Band Decoder Schematic (PDF) Latest version (4.7)! Click image above to view Provides antenna lockout to prevent putting both radios on the same antenna (a bad thing!) Dual band decoders (one for each radio) may be used to drive antenna selection or some other purpose. Includes hot switch protection and optoisolated band data & PTT inputs.	Control / Dual Band Decoder PC Board Layout (PDF) Latest version (4.7)! Click image above to view High quality FR4 double sided 1oz copper, masked, and silk screened both sides. Designed in sections so all sections do not need to be populated. If you have no need for the band decoders then you can just populate the relay driver and antenna lockout section. An AC to DC regulator section is included in case you don't have a 12V DC source. If you have a decent junk box and are creative, then you can build this pretty cheaply. Available for purchase. Email for availability. Construction Notes (and other info!) Auto Band Decode Modification Instructions

Other Information
	Detailed Bill of Materials in XLS format with Mouser partnumbers Click image above to view
Switch Writeup and Measurments (PDF) Click image above to view All the details you need...I hope.	Mouser Project Files: Controller/Band Decoder Parts Relay Board Parts Other Parts Sources: Source for relays (AZ755-1C-12DE) Source for Relay Board CHASSIS (7112C) Source for Control Board CHASSIS (TG-28)

Orginal Control Board / Dual Band Decoder Errata & Addendum (PDF) Click image above to view Highlights changes to original controller board. NEW BOARDS HAVE BEEN FABRICATED!	Gallery! Click image above to view A few dozen folks have built this project. I only have pictures of a few. Here is their FINE work!

Original Relay Board Schematic (PDF)	Original Relay Board Layout (PDF)

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