Line
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@comcast.net


KK1L station configuration - How I use these boards.
Relay Unit
(In Stock)
Control / Band Decoder Unit
(Out of Stock)
Icom Band Decoder Daughter Board
(Out of Stock)
Frame Frame
High Isolation Relay Board
Click image above to view

High quality FR4 double sided 2oz copper, masked, and silk screened both sides.
Dimensions: 10.1875" x 6.5".

12V activated relays with 50Ohm termination on unused antennas to reduce reradiation and unwanted internal coupling.

Impossible for one radio to transmit directly into another.

Worst case port to port isolation
61.2dB!

Jeff, AC0C, has done a thorough analysis of the switch and posted the results on his web site. Read the charts carefully. The "both antennas selected" cases are the typical use. There are several other interesting configurations as well. GREAT STUFF!

Bare PCB available for purchase.
Email for availability.
Control / Dual Band Decoder
Click image above to view

High quality FR4 double sided 1oz copper, masked, and silk screened both sides. Dimensions: 6.125" x 4.0".

Includes two fully independent band decoders and the logic to control the 2x6 switch relays. Band data can be wired on DB25 LPT connectors (classic defacto standard) or BCD inputs (Yaesu, K3, or custom cable from other 4 bit band data devices).

Bare PCB available for purchase.
Email for availability.
Icom Band Decode Daughter Card
Click image above to view

High quality FR4 double sided 1oz copper, masked, and silk screened both sides. Dimensions: 1.8" x 1.3".

A fully opto-isolated interface between an Icom radios analog voltage band data output and the Antenna Switch Controller. The board is designed as a "daughter card" which plugs into the CD4028 socket of one or the other port of the controller. This board takes the place of all the components of one of the two decoders. It can be used as a stand-alone decoder as well!

Bare PCB available for purchase.
Email for availability.
Frame Frame
High Isolation Relay Board Schematic (PDF)
Click image above to view
Controller / Dual Band Decoder Schematic (PDF)
Click image above to view
Controller / Dual Band Decoder Schematic (PDF)
Click image above to view

Unsolicited Customer Comments!

  • W1UJ: Hi Ron, the newly constructed switch worked wonderfully this past weekend for ss cw. There was improved isolation ..or.. decreased coupling between all of the wires when using your switchbox. No scientific studies, just hammering 1000 ss cw qso's through it on all bands qro for 24 hours. I really consider this a huge asset to the shack. Thanks Ron!
  • I2TZK: Thanks a lot Ron, the unit did an excellent job during the contest.
  • K1KD: Here are a few pics of the finished product. I use it every day!
  • EA2AYD:I already finished the project and all equipment is working perfect! I attach you some photos of the construction. I already used everything on some contests, I even heard you working us on some of them, when we where using the equipment on the Multi Single station. I was not operating at this moment, so I was not able to let you know...The "Sixpack" is working very well with more than 1 KW and the switching box is working well also
  • WA3UTC: The project went well and the second controller will be completed this weekend and the SOR2 controller prototype in about a week. I will send you the controller's SOR2 schematic when I have the little guy up and running. This was an easy build and the build allowed a vast amount of freedom in the process. Power up went as it should with a simple resistance check, then a power up without the chips installed and then with the chips installed. I did follow F4EJO's idea of the aluminum spacers and that worked out very well. The labels are something we all played with when we put models together when we were kids...... Water Slide decals!
Top IconReturn to home page

Line
website hit counters
Provided by www.website-hit-counters.com .