Stealth Attic Antennas - Bill/W6OAV & John/W6NBC
Ғылым және технология
Do you live in a covenant controlled area and wish to put up a stealth compact, but efficient, HF attic antenna? Or, you just don’t have room in your yard for a full sized HF antenna? If so, plan to attend the DRC May 19th Google Meet session.
Bill, W6OAV, will discuss his successful experiences with various compact HF attic antennas. Then a video titled “Jumbo Loading Coil for Concealed Attic Dipoles”, produced by John, W6NBC, will follow.
John describes a very effective and unique compact HF attic antenna built around a “Super Coil”. His discussion will also include a bit of antenna theory relative to shortened antennas.
0:00 Intro
0:53 About Bill
1:28 HOA Goals
2:19 Agenda
3:27 8JK Antenna
5:58 Compact Dipoles & Beams
7:04 Why bend a dipole?
13:15 Attic Dipole
15:07 Why a bent dipole?
15:51 Modified 8JK Beam
18:16 Commercial Antennas with Bent Elements
21:51 Magnetic Transmitting Loop
25:32 Vertical Loop Radiation Patterns
26:16 Horizontal Loop Radiation Patterns
26:52 Stealth Antenna Farm
30:38 References
33:45 Loading Coil for Concealed Dipoles
35:57 HF Attic Dipoles
36:34 The Solution?
36:51 HF Loading Coils
46:00 Why a large coil?
46:22 Antenna Circuit
54:33 Coil size comparison
56:29 Tune & Match
59:35 Tuning Options
1:01:03 Tuning Principles
Пікірлер: 10
I can't believe that I have stumbled upon your exciting video, we have recently moved back to our home state of Idaho in retirement to an hoa neighborhood after living on 2 plus acres for 30 years, and now I am facing this Exact issue myself. Exact, and we too live in a tri plex with my Shack in the basement. Wow this will be so helpful over the next few months. My immediate issue is finding a path for coax and or ladder line from the attic down to the basement, as no room is directly over another lol, Thanks so much for taking the time to make this video,, !!! Merry Christmas and blessings to you from Idaho!
All my antenna's have been and still are 'stealth antenna's,' and I have worked the world using 60 watts J3E, 10 watts A1A.
I enjoy these talks thanks for uploading
There’s some useful information here. Hard to believe no one told that second guy to fix his audio.
That's a big attic. 5 dipoles, 20m to 10m bent into my attic. 20m and 17m coiled at the ends round the roof beams to form large coils. I used a mag. loop in the bedroom shack to null out noise on receive from one direction. They work well considering their small size. For other h.f. bands I made a copy of a Joystick, if anybody remembers them, in the front bedroom. I have 26' of wire to it and an MFJ16010 tuner which I was given as not working, the system tunes 160m to 10m. The tuner had an intermittent fault easily solved by re-soldering a wire inside. For 2m I have a 2 element collinear in the shack. All aerials h/b. Many years ago I put a pallet wood walkway below the roof apex so I could walk around safely. G4GHB.
Ok, I have a question. I am also in an HOA and am antenna challenged as a result. I have finally been allowed to have a G5RV Junior as long as I keep it low as an NVIS antenna in an inverted V at 14 feet at the center, they also allow me to have a “Fat Spectrum” vertical antenna. I have been interested in a bent dipole hidden under my roof, but I do not have an attic, I have vaulted ceilings instead. I am not sure if I attach a bent dipole to my ceiling rafters directly above my station will work or not
@Volcano-Man
7 ай бұрын
Well amateur radio is also about experimenting. With that in mind, measure you available space - length, width and height. Then calculate what antenna you can fit in that space and draw it all out to scale. Then you'll know. I had a full size G5RV in a roof space,lots of twists and turns, and I worked VK from GM using 60 watts J3E on 20 metres.
Audio drops at 1 hour into the presentation. Can it be fixed?
I really wanted to learn from this, but the audio is so bad for me it makes it unreadable. 45 minutes in and i'm giving up and searching elsewhere .
KO4ZCJ MEMPHIS TH