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What is SWR in Ham Radio?
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@fm71450 is wondering how to make a good connection to his antenna farm without too much loss. What is a good system for this? Will coax or ladder line be better?
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Videographed and Edited by Teagan Kulbeth, KF0UTR
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In this video I make a version of M0PZT’s Cobra antenna that is a bit more portable. This is a 80m Linear-Loaded Doublet that is only 40′ long.
I need to do more testing and get the antenna higher to see if it improves the efficiency. Below I will list parts needed for the build.
M0PZT-https://www.m0pzt.com/80m-cobra-doublet/
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#hoa , #antenna , #hamradios
After weeks of planning and fabrication, I finally fitted a 12 V winch to my ham radio antenna mast — and it works beautifully.
This video shows the full process of building a self-lowering tower using a falling-derrick system. From drilling and painting the custom angle-iron bracket to wiring the remote-controlled Winchmax unit, every stage leads up to that magical moment when the 14 m mast lowers itself effortlessly.
🔹 Tower height: 14 metres
🔹 Winch: Winchmax 12 V (1200 kg)
🔹 System: Falling Derrick with shock-absorbing mooring rope
The end result? A tower that can be safely raised and lowered at the touch of a button — no sweat, no strain, just solid engineering.
Stick around for the drone footage — it’s one of the most satisfying builds I’ve ever filmed.
73,
Callum (M0MCX)
—
🎥 Next video: Taming the 4-Square!
0:00 The Plan – Building a Self-Lowering Mast
0:34 Preparing the Winch Mount
2:00 Drilling & Fitting the Angle Iron
4:10 My Vintage Pillar Drill (Ajax)
6:05 Cutting & Painting the Bracket
10:22 Stainless Bolts & Final Assembly
12:00 Wiring the Winch & Remote Control
16:38 Day Two – Setting Up the Falling Derrick
18:46 Checking Guy Ropes & Safety Lines
19:48 Mooring Rope Trick for Shock Absorption
22:27 The Big Moment – First Power-Down Test
25:30 Raising the Tower Again
26:46 Drone Footage – Smooth Lowering in Action
30:13 Fixing the Rotator & Camera Mount
30:55 The Big Lift
33:37 Lessons Learned & Improvements
35:11 Tired vs. Exhausted – A Quick Reflection
36:06 What’s Next – Taming the 4-Square
#hamradio #dxcommander #antennamast #engineering #winch #hamradiotower #diyproject #radioengineering
It’s crunch time for the 40 metre 4-Square! Today I’m on a mission to tame the "Beast" – tightening connectors, colour-coding the feed lines, and fitting what feels like a mountain of ferrites (about 40 of them… nearly £300 worth!) to choke every last piece of unwanted current.
There’s plenty of laughter, plenty of solder, and a fair bit of head-scratching as I prepare for the final "X = 0" tune-up. We’ll talk coax, choking strategy, dump-load measurements, and how to keep a 4-Square behaving before that all-important tuning day.
Grab a brew – this is the big push before perfection.
📡 Ferrite mix: Type 31
SPENT TODAY:
💷 £297 on ferrites
💷 £110 on the 33m of Aircell 7
🧰 Next episode: "X = 0 – Final Tune!"
0:00 Intro & today’s mission
0:20 Ferrites everywhere
1:00 Cabinet & connectors
2:00 Colour-coding feed lines
3:15 Clip-on vs wound chokes
4:45 Cabinet tidy-up
6:10 Ferrites on each radiator
8:40 Type 31 mix
10:10 Heat-shrink & Ox-Guard
13:50 Connection fixes
14:50 Dump-power check
15:30 Choking the tower
17:00 Coax recovery
18:30 Storm & dead-man anchor
20:00 Old coax reels
21:10 New patch lead
23:00 Cable-wrangling tricks
25:20 Cable-tie chaos
27:30 Power-meter setup
28:15 First readings
28:50 X=0 tease & wrap-up
The CQV SWR-508’s battery operation can affect its SWR. Internal power below a certain voltage might influence measurements. This device measures power, SWR, max power, reflected power, antenna wattage, and efficiency.
👉 Full video: https://youtu.be/syzo8-0kwgg
Devices Under Test:
👉 CQV Meter: https://geni.us/OSEK2jg
👉 Nissei Meter: https://geni.us/ZKuIme
👉 Celwave Dummy Load: https://geni.us/YlnRyc
👉 100w Round Dummy Load: https://geni.us/eTZ18Uh
👉 10w SMA Dummy Load: https://geni.us/U733N
👉 Screwdriver Set: https://geni.us/OilK
👉 ABR Coax: https://geni.us/AnDVyG
#CQVSWR508 #hamradio #SWR #antennawattage
How to mount the Sky Hook to a Tri Pod, The Pod From The Ham Stop
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Sterling and I build the very easy and cheap Meshtastic solar node.
Instructions here : https://meshtastic.org/docs/community/enclosures/rak/harbor-breeze-solar-hack/
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Intro music provided by one of these;
Silent Partner – Fortunate Note
Noir Et Blanc Vie – Brighton Lights
John Deley & the 41 Players – Heat Wave
Doug Maxwell – Psychedelicacy
Big Blues by Audionautix is licensed under a Creative Commons Attribution 4.0 license. https://creativecommons.org/licenses/by/4.0/
The Icom IC-7300MK2 is here! Join Dan VK4DNO from Icom Australia and myself as we dive into the menus, look at it’s new features and some Q&A in the chat.
📨 Ham Radio in 30 Days: From Zero to Hero
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Antenna Location Matters
