Is there any way to get 80, 60, and 40 on an EFHW? (Maybe with loading coil(s) or traps?) *73 de AF6AS in **_“DM13”_** land*

Is there any reason that _linear loading_ wouldn’t work (well) on a shortened EFHW? What affect does linear loading have on the harmonics? *73 de AF6AS in **_“DM13”_** land*

Using an Ampro 10m stick attached to my Greenhouse up the garden with a short wire and crocodile clips to connect greenhouse frame to coax braid (outside of plug but not able to lower swr below 2 despite adjusting wire whip up and down over some 12 inches down to end of whip up an inch at a time. What am I doing wrong as a meter reading gives continuity between greenhouse frame and coax braid and also whip to centre plug pin. Greenhouse is aluminium frame 10' X 8'. Also attached 2 1/4 wave wire radials to base of antenna with no improvement. Using my trusty G90 for tuning and TX. Top of antenna some 15' above ground level. Replaced whip grub screws with bolts to make screwdriver adjustments as allen key easlly lost. Help!

Look at the hitch hiker's guide to the off centre fed dipole . . .

Excellent! - thanks, Tim.

love Shaun The Sheep on the right

I use 2 elevated 1/4 radials radials about 10 feet/3 meters above ground as a balanced counterpoise against my inverted 1/4 wave L's at my QTH. I do this for one antenna cut for 160 meters and a seperate antenna for 80 meters. Is a very successful DX antenna on 80 meters. Use a simple Toroid Match from the Coax feed to the antenna. Very solid simple and easy to maintain antenna. Maybe hear you guys in the 80 meter DX window some time..

You can actually make them yourself, Marty has (or had) videos where he walks through how to construct the mad dog using materials readily available in Bunnings (Aussie hardware store like Home Base), and no complicated machining necessary . I feel I should buy them though as he's put so much work into this and other products...

Interesting that 84’ is one of the _”optimal”_ lengths of a _random wire_ antenna … *73 de AF6AS in **_“DM13”_** land*

Thanks for the video, definitely helped my thought process. Interesting how perceptions change with progress. I was given a radio from a silver key once considered a portable. FT-101, it even has a carry handle. The only snag is it weighs about 15kg! Which makes me wonder if a larger shack rig could later be used to try field operation. Just a thought :-)

Great video Tim, my qth suffers with s7-9 most of the day, and I was at a point of giving up,and after watching your video, I took the plunge,dug out my tent! And headed out to a campsite, an hours drive away, using a tri mag mounted on car, and Ampro 20 meter antennae, tranny in tent, I discovered just what I had been missing, it was an awakening! First copy was to Iceland,and then dozens of contacts around Europe, and following morning Australia. As you said, if you suffer from noise on the bands, get yourself out n about. So good, iv even booked up my next camping trip in a few weeks time! Cheers Tim

Look into old antenna books. Been around for many decades. Fiirst antenna i used the early 90's. On 80...yeah. cloudburner. Above. The radiation angle comes down and is a very good antenna on higher bands

Great info packed into one video Tim! :)

vu2pll.blogspot.com/2015/11/vu2pll-hf-hombrew-mobile-portable.html?m=1

What a _”Co-Inky_Dink”!_ Chameleon just introduced a 25 foot / 7.6 meter telescoping whip … Hmmm … *73 de AF6AS in **_“DM13”_** land*

So many things in life seem to follow that _”2 out of 3”_ rule. In an engineering project it’s: quality, budget, and schedule. Pick two … Also, regarding coil *resistance* -- is that the same as *DC* resistance, or does _skin effect_ raise the resistance at RF since less of a (solid) conductor actually carries the current? Would, (hypothetically) silver plating a thin-walled copper tube lower the resistance? *73 de AF6AS in **_“DM13”_** land*

very interesting - thank you Please correct me if I am wrong - is adding the capacitor across coil - lowers the q There is a formula for calculation of C for capacitor to correct the Q of the coil X_L = 2 * π * f * L X_C = X_L * (1 / QDesired - 1 / QCurrent) Capacitance (C) = 1 / (2 * π * f * X_C) where: - X_L = Inductive Reactance - X_C = Capacitive Reactance - QDesired = Desired Q Factor - QCurrent = Current Q Factor Am I correct ? (I am not trying to correct anybody - just to verify if I am wrong) I have created a soft for myself to calculate parameters for the coil to shorten the 1/4w vertical - for 2m vertical for 7.1 Mhz - with a coil in the middle it is 57uH and Q for the coil was 420 - adding capacitor of 470pF gets it close to Q 50 which makes the antenna wide band Soft is over 200 lines long so I can not show it here - it is in PowerShell so it runs on any Windows PC or Mac with Powershell installed. I am learning so I might be wrong.

Another helpful video. I cannibalised exactly this antenna just last weekend. I had built it as a shortened EFHW for SOTA and holiday locations where space is limited. I deployed it as an inverted V and found it very sensitive to the height of the loading coil and unpredictable in different settings so I abandoned the idea. All that I needed to do was to watch your video. Setting it up as a vertical gives a predictable height for the loading coil and repeatable antenna! Good work. Thanks MW0KXN

I love the frequency on the 2nd VFO

Please can you help me I want to job 1:31

Please can you help me I want to job 1:31

Please can you help me I want to job 1:31

Please can you help me I want to job

Hello

Sounds like the Inverted V is ideal for NVIS. Not too much of a hustle to set up for 40m, since all you need is a tree and a couple of guy rods. Thank you for the detailed explanation!

@Tim: would be awesome when you pin a comment to the top, that the graph at 2:57 is not correct. That is the feed point resistance and not the radiation resistance. 1200 Ohms is wrong for Rr auf a half wave antenna, as its 73,1 Ohms.

Tim, hello. Do you have HOA’s in England? Here in the States we consider them to be evil!

Did you find any directionality being on the slight slope? It all sounded solid mate. From Alien in Asia FOO😊

Excellent..well explained..hf is a wonderful thing and it's up to us to keep it going

I worked in the 2008 CQWW from Belize. It was great fun - and we were the only station active from Belize, so we were a rare 'un. We earned a BIG certificate for the wall.

Great ideas. At 10 min 20 sec you said 1:1 balun. Wouldn't it need a different ratio to match 50 ohm coax to 400 ohm ladder line ? I am still low on the learning curve and really enjoying your channel!

Thanks Tim. Finished a homemade 1:1 balun with 140-43 core and 1mm copperwire and build a 1/4 vertikal today for 20 meters, got it tuned with the help of a VNA. Hopefully I can do some live testing later this week. Used 20 3.5 meters radials made of old network cabel and the ariel is 0.75mm electrik cabel. Mounted on a 5 meter fiberglas fhishing rod and its sitting on my garden fence ground mounted. Nice to see this video on your build. Hope to hear you on 20 meters. 73 and many thanks

What you're describing is common mode rf that's coming down the feed line into the shack. Problem would be rectified by using a choke of some sort. Has nothing to do with "radiating element"

I wouldn’t worry too much about _”compromise antennas”_ - if you want the _”optimum”_ contact, you might run coax all the way to the other ham’s shack and *bypass* the antennae altogether. 😀 I’m *guessing* that the insertion loss of a few thousand kilometers/miles of coax would still be less than the path loss transmitting a signal that same distance, including a _”side trip”_ to the *ionosphere (at least* once). *73 de AF6AS*

I’d have to fire up _4NEC_ to find out, but I wonder about a couple of things: 1.) Putting in a full circle of radials, then remotely switching a number of sectors in or out to increase gain in a certain direction (directionality), and; 2.) Somehow _”tilting”_ (just a *few* degrees) the vertical in a certain direction to improve directionality a bit. *73 de AF6AS*

Hi Tim, avid viewer and reader of your work. Do you have a complete citation for the ARRL work yiu used here? I scanned the latest Antenna Handbook and did not see what looked to be your source material. 73 de K4FMH

Brilliant video - decided to order a few extra collars!!

I have a multiband glass fibre Moonraker vertical mounted on a pole above my garage. It is connected to a Xiegu g90 and I have been into Italy, Russia and most of Europe no issues.

Looking for a solution for the RV so stumbled onto timely. Would be remote tuner. Really considering remote tuner in a dipole configuration.

Great video Tim, not sure if it's an ATAS killer as obviously its quicker and more convenient to tune the ATAS. I have both antennas and both are very capable, the Slidewinder is also cheaper of course making it a better option for those on a budget. And obviously better for anyone who doesn't run a Yaseu. 73 Mike M0VOZ

So, just out of curiosity, what frequency did you cut for? And what length did you make the radials? Where they the same length as your antenna? Thank you in advance

I would try a 9/1 unun

I have the super antenna. I love it. You can get the swr perfect on it adjusting the coil.

I've been trying to resurrect an old Cushcraft MA5V vertical (20, 18, 15, 12, 10 meters) elevated to about 25 feet on a pole but it lacks effectiveness. However, it is pretty noisy most of the time. I saw another video using this design and it seems pretty quiet noise wise. Will try this design. Thanks for the idea Tim.

Your analysis seems to ignore I²R at any given point along the antenna. Too bad.

Not bad at all! I wish I had the enthusiasm to get up and out that early! ;-)

My favorite HF multiband antenna. Works great on MW broadcast band as well. Aloha es Russ (KH6JRM).