July 7th 2025 #259 - Slot antennas, lightning protection, and ham travel ops | W3GMS Workbench
Manage episode 493376723 series 3669859
Host: Wayne, KC3SQI
Topic Focus: Slot antennas, lightning protection, and ham travel ops
Location: W3GMS 146.985 MHz Repeater – Parkesburg, PA (PL 100.0 Hz TX / 94.8 Hz RX)
🧵 General Highlights
- Warm welcome to new and returning stations like Phil (KA1PXZ) and visitors from Vermont and Massachusetts.
- Field Day leftovers: Many ops are still packing up, sorting gear, and requesting photos for compilation.
- 13 Colonies Contest: Several participants shared their clean sweeps, and a few worked the bonus stations.
- Slot Antennas 101: A spontaneous deep dive sparked curiosity, explanations, and offers of hands-on help.
- Lightning safety practices discussed, including the limits of grounding switches and the effectiveness of storing coax ends in glass jars.
- Antenna modeling and compatibility in EasyNEC touched on stacking, vertical and beam interactions.
- Traveling with ham gear: Helpful tips for scanning, repeater book use, RT Systems programming, and managing expectations on repeater activity when away from home.
❓ Workbench Questions
🛠️ What is a Slot Antenna?
- Bill (KC3OOK) asked for a plain-language explanation.
- Contributions from Ron (WA3VEE), Chuck (NA3CW), Harvey (3NZT), and others clarified that:
- Slot antennas radiate perpendicularly to the slot.
- Used frequently in radar and stealth installations.
- Designs can be compact, mobile, and stealthy.
- John Portune (W6NBC) is a go-to source with QST designs and build guides.
⚡ Lightning Protection & Coax Handling
- Several operators offered insights:
- Disconnecting antennas outside is best.
- Grounded coax switches help with static but won't prevent damage from a direct strike.
- Putting coax ends in a mason jar might contain sparking—but not useful for a direct hit and may be dangerous.
- BlitzBugs, polyphasers, and physical disconnection are the gold standard.
📡 Modeling an X-300 Vertical on Top of a Hex Beam
- Wayne (KC3SQI) asked about modeling in EasyNEC and whether stacking the X-300 above a hex beam would interfere.
- John (WA3KFT) noted he’s had directional beams and verticals near each other without noticeable interaction.
🚗 Ham Radio While Traveling
- Chris (KD3EMS) asked how others handle ham radio on the road.
- Suggestions included:
- Use of RepeaterBook mobile app.
- RT Systems or CHIRP for programming based on trip routes.
- PL tone scan to identify unknown repeaters in real time.
- Accept that most repeaters are quiet, but local nets can be an inroad to friendly chatter.
🎤 Notable Mentions
- Phil (KA1PXZ) heading to Sussex and maybe activating some POTA sites in Shenandoah NP.
- Ron (WA3VEE) completed another 13 Colonies clean sweep and invited members to share Field Day photos.
- Chuck (NA3CW) refurbished a classic tuner with new paint and bearings.
- Harvey (3NZT) offered Bill a custom-built slot antenna to experiment with.
- Chris (KD3EMS) excitedly shared success hitting the ISS and SO-50 satellites—impressed at how approachable satellite ops can be.
6 episodes