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Timewave ANC-4 Adding A Foot Switch Via Relay

Discussion in 'Homebrew and Kit Projects' started by N7BB, Jul 27, 2021.

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  1. N7BB

    N7BB XML Subscriber QRZ Page


    It's been quite a few years since I passed my Extra Class test. Admittedly, I have lots of antenna making skills and experience, but I'm quite rusty on simple circuits.

    I've never actually wired a relay before. It seems simple enough, but at the risk of damaging equipment I can't afford to replace right now, I'm reaching out to the collective knowledge base!

    I want to add a foot switch in line with my ANC-4 DC power cord. I want to do this because oftentimes the relays inside the ANC-4 click on/off during transmit because my Noise Sense antenna is too close to my transmit antenna. I cannot re-locate the noise sense antenna. Oftentimes I just switch the ANC-4 off during transmit, but this is a pain.

    I think I need a Normally Closed relay. It seems simple enough, but I'm confused about the grounding.

    From my DC power strip, I should apply Positive and Negative wires to the corresponding terminals on a relay. Another terminal will power my ANC-4 "normally closed". Another set of terminals will be wired to my foot switch. I can open the circuit when the foot switch is pressed, which will (or should) momentarily cut the power from the ANC-4 while I'm transmitting.

    Most diagrams I see only have one positive wire to the "device". This is where I need wiring help.

    I want to make sure I purchase the right type of relay for this application! I see many automotive relays on Amazon which are relatively inexpensive. Suggestions are appreciated.

    Sure, I could probably just wire a SPST switch inline with the DC power cord to the ANC-4. The relay seems like a cool project & also it's practice for me. I have future plans of making a remote ladder line antenna switch using relays.

    Thanks for reading, and thanks in advance for your help!
  2. N7BB

    N7BB XML Subscriber QRZ Page

    Image.png This may be overkill, but Pos/Neg to Power supply, two terminals to DC plug on the ANC-4, the other two to the foot switch?
  3. N7BB

    N7BB XML Subscriber QRZ Page

    I suppose I'm in the wrong forum. I'll re-post elsewhere.
  4. AH6GT

    AH6GT Ham Member QRZ Page

    Hope you have gotten your ANC-4 foot switch working. I found your post here because my ANC-4 also clicks when I am transmitting.
    I am thinking that some heavy ferrite on all the wires and cables coming into the box might help, but have not done so yet.
    Anyway, 73 and Aloha.
    Konabob AH6GT

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