Like a lot of hams, [Stuart] wanted an “on the air” sign. These signs often connect to a PTT switch or maybe an output from the transmitter that also does things like switches antennas or switches in an amplifier. [Stuart’s] version, though, simply senses the radio frequency emissions from the transmitter and lights up that way. You can see two videos about the sign, below.

Honestly, we are a little worried that he might have too much RF at his operating position. Presumably, the device is pretty sensitive, especially if there’s any actual antenna on the sign. A comparator and a pot let you set the sensitivity so it doesn’t light up when your garage door opens.

The sign itself looks great thanks to a laser cutter. LEDs light up the entire sign in either red for on the air or another color for receiving operations. The acrylic sign is edge-lit which gives it a very nice effect.

We always enjoy edge-lit projects. Reasonably simple to do, and the effect looks great. If you have a laser cutter, you can get some very professional-looking results. If you are interested in the FT8 communication mode, we’ve talked about it before.

I just got one of these for $20 from my local electronics store

https://www.zavvi.com.au/gift-home-office/on-air-light/13030328.html?affil=thggpsad&switchcurrency=AUD&shippingcountry=AU&&thg_ppc_campaign=71700000068296872&gclid=EAIaIQobChMIoOO-z_TX8wIVSiQrCh304AJYEAQYAiABEgKGEfD_BwE&gclsrc=aw.ds

Maybe I can change the switch to a relay to trigger it.

Oooooh! I hadn’t thought of putting acrylic in my NEJE laser etcher! If it works, it could make some neat Christmas Tree (tannenbaum -Elliot B^) ornaments!

Please be kind and respectful to help make the comments section excellent. (Comment Policy)

This site uses Akismet to reduce spam. Learn how your comment data is processed.

By using our website and services, you expressly agree to the placement of our performance, functionality and advertising cookies. Learn more