Ham Radio 40/80 Meter Inverted V Dipole Antenna

Used this to add 80m to the 40m portion of my fan dipole, worked well. Thanks.

What's a good antenna for 80, 40, 20, and 10 meters?

that is a great video. I will be building one of these soon. I do a bunch of wood work..... spar urethane will probably last longer or some marine urethane. The polyurethane is an interior product... but will probably last a long time in this situation. this will be a fun project. I hope mine is as neat as the one you did.

would be nice if we could hear how it works instead of moving around the wires(makes noise) connected to a radio,compared to each other. I stopped reading at8 minutes into the video.

Great video, Dave! Thanks so much for taking the time, this may be my next project. 73, Howard W1HBO

Excellent coil making instruction. It gave me the confidence and interest to try this.

Hi Dave, another excellent video. I am assuming that once the coil is polyurethaned then it will be structurally stable and wires should no longer move, is that correct?

I always use a dip oscillator

Would plastic dip for weather proofing work to coat the wires? Thanks for making your videos. I subscribed

Hi Dave, thank you for the awesome video. I am a newbie and I am trying to build this antenna. I noticed I wound the coils clockwise or opposite to the direction in the video. Does this affect the antenna?

Please help. I am just good cb operator. I am getting intentional qrm from illegal c.b. operations.

Thank you for good videos.

thanks for the video !

Dave, so if I want to talk on 3.830 MHz, I would remove a few turns on the coil?

Great video ! Well done. Can you be so kind to confirm the size of the PVC pipe, you said it was and 1 1/2 Dia then you say it was 48mm dia. 48mm is approx 2". Im assuming you mean 2". Thanks again.
Mike

Bravo muy bueno GRACIAS

Finally got mine built after about a year and a half just piddling with it. I should swing it in the air tomorrow evening!

From what you see in the grid of the notebook the diameter of the PVC would be 2"

Thanks for the video. I'm wondering though, when winding the wire, does each 'turn' need to be in direct contact with the other turns? I mean, will it not work properly if there is a gap between turns? I saw a photo on eHam in which the person used caterpillar grommet to help keep a consistent 'gap' between each turn. So, this is why I'm not sure whether or not the wires need to be touching for it to work properly.

New to this whole antenna building but my question is , the wire wrapped around your coil seems to me that it might be the added length needed to make the 80 meter antenna the length it should be if no coil was installed. Am I wrong in my thinking?

did I calculate wire length correct? 50mm(1.9685") x 78 = 153.543 inches or 12.79525 feet

Perhaps you will help me, I have asked others and get,"oh there are loads of diagrams on the internet, or there are a list of measurements on line.. look this is not helpful for me I just want to know at twenty five feet of height how long and how far away from the centre is each leg going to be? Thanks Owen in Ireland!

I have built this type of antenna several times. The diameter of the coils has varied depending on the material available. The only important thing is that the impedance is around 100µH. In my construction proposal the author says that these are traps which due to the design of the antenna the coil have 5pF parallel capacitance. That gives a resonance around 7.1 MHz.
73 Bernd

Hello and thanks for the video. Question do you recommend a 1.1 balun for this antenna

hello, thanks for sharing, very good job, hello from france

Thank you for taking the time to do this video and to show exactly what you are doing. I has been an immense help to me.

Dave, do you know the inductive value of your coil (milli or micro Henrys)? .. as I have hundreds of feet of 22 gauge .. since this antenna is end loaded, I’d think the current is not expected to exceed what 22 g can handle ...

This antenna really works! Here's a coil for us in Europe: 40mm diameter PVC former, 1.6mm diameter enamelled copper wire, 176 turns closewound. Works a treat. I got myself an ultra-cheap NanoVNA, which made tuning it a piece of cake. Many thanks to Dave, also to IK1ZOY and I2CN for sharing this great antenna. SV1UI.

Going by your descriptions, I figured your trap to be about 125 uH; Would it be fair to say that if 125uH could be achieved with a different size wire, like insulated 12 or 14 AWG, that constructing a trap with the same L would be about right...all other things being equal?

50mm is TWO inches(2”) not 1.5”! One and a half inches(1.5”) is about 39mm! I am building this antenna & need to know where is the error is? It is with IT2VOY or is the error here? Please clear this up or at least give uH values so I can test it with a dip meter.

Dave. Can I use the same measurements and coils on the 40,80, and 160 meter antenna using an end fed setup instead of an inverted V? My coax feed is about 15 feet from my shack, so I would prefer to use it this way. Can't wait to get started. Love your videos. KI7MLM.

On 80m, my antenna would drift about 100kHz down when the coils were wet with rain. The problem was solved by putting a larger plastic tube over each coil, supported by plastic struts so it does not touch the coil. Snow is a different story: When snow-covered, the antenna doesn't work at all on 80m, though it remains perfectly useable on 40m. Thankfully, we don't get that much snow here in Greece!

Nice job Dave, Thanks again. My Grill rotisserie made this job ALOT easier.

How about using clear "FLEX SEAL" on the coil to keep the elements off it?

Dave your class

Thorough as usual Dave! All Your projects shine with Your thoroughness!! ENJOY IT TO THE FULL! What contacts you may get! Good Sport!
Well done!

Dave your videos are super helpful thanks kM6MjC 73s

Book by Gover on calculating inductance.

Would these coils be resonant as built on and EFHW antenna?

What about adhesive shrink wrap to seal it?

Anyone tell me, what gauge wire did he use whether it is stranded or solid? Thanks i just watched the video and did not hear what gauge wire to use. not for the coils. W5TGS

Is there a difference between a coil loaded dipole and a trap dipole?

Brilliant lesson / tutorial on coil construction and winding Dave, thank you. I'm just finishing my morning coffee, have got my tape measure, and am going to see if in my small garden I've got enough room to have a go at a loaded dipole version of this for 40/80 meters. But even if I don't have enough room for the antenna, what I've learned about coil winding will be a big help with other antenna designs. Regards to you and your family Dave, David (M0XQZ).

another outstanding video ...thanks dave ...73

Thanks for the video i enjoy watching this i made the coils the same day i had a little bigger size coils so the inductance is now around 150uh

where you been Dave? haven’t seen any new stuff in a long while.

OUTSTANDING tutorial!! The entire set-up worked GREAT! Thank you.👍 Instead of urethane, I used a couple of layers of UV-proof electrical tape.

Olá Davi é o site que vc tinha com os projetos de antenas tentei o link do vídeo mais não está no ar! Vc tem pág no face Book com aqueles projetos? 73 Brasil 👍

You said the formula for the coil is in the manuals. I learned that many years ago (in college), but ... is the permeability of the coil the same as for an air core or does that PVC change it?

73 de AF6AS

So got a resonant 40m inverted v 7.100 flat swr with 49 ohm as soon as I add the coils it sends the 40m section swr through the roof , what am I doing wrong 😢