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
Both PC boards now available for purchase.Email me at callsign@arrl.net
| Relay Unit Information | |
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New High Isolation Relay Board Schematic (PDF) 22-DEC-2008 Click image above to view12V activated relays with 50Ohm termination for unused antennas to reduce reradiation and unwanted internal coupling. NEW: I measured port to port isolation to be -61.2dB worst case! This is a whopping 24dB improvement over the previous version while keeping the same features and size with a lower parts count! |
New High Isolation Relay PC Board Layout (PDF) 22-DEC-2008Click 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 informationChassis Drill Template - mirroredChassis Drill Template - standardMouser Project File: Please note: All electronic parts are included in the project files. Any unneeded part can easily be removed from the Mouser order. Chassis or enclosure need to be ordered separately. Relay Board Parts (includes substitute relay available at Mouser) |
| Control / Band Decoder Unit Information | |
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| Controller / Dual Band Decoder Schematic (PDF) Latest version (4.8)!Click image above to view Includes two fully independent band decoders and the logic to control the 2x6 switch relays. The configuration is highly flexible. Use the decoders to drive the relays or something else if you wish. Provides antenna lockout to prevent putting both radios on the same antenna (a bad thing!). Includes hot switch protection and optoisolated band data & PTT inputs. Band data can be wired on 25 LPT connectors (defacto standard) or BCD inputs on header pins. Version 4.8 includes the feature to make it easy to combine both the auto band decoding and manual antenna switching! |
Control / Dual Band Decoder PC Board Layout (PDF) Latest version (4.8)!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 for previous versions 4.7 and
4.3Mouser Project File: Please note: All electronic parts are included in the project files. Any unneeded part can easily be removed from the Mouser order. Chassis or enclosure need to be ordered separately. Controller/Band Decoder Parts |
| Other Information | |
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 Detailed Bill of Materials in XLS format with Mouser part numbers Click image above to view |
| Switch Write-up and Measurements (PDF)Click image above to view All the details you need...I hope. |
Mouser Project Files: Please note: All electronic parts are included in the project files. Any unneeded part can easily be removed from the Mouser order. Chassis or enclosure need to be ordered separately. Controller/Band Decoder PartsRelay Board Parts (includes substitute relay available at Mouser)Other Parts Sources: Source for relays (AZ755-1C-12DE)Alternate source for relays (AZ755-1C-12DE)Source for Relay Board CHASSIS (7112C)Source for Control Board CHASSIS (TG-28) |
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| Original Control Board / Dual Band Decoder Errata & Addendum (PDF) Click image above to viewHighlights 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! |
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| Original Relay Board Schematic (PDF) | Original Relay Board Layout (PDF) |
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