Hello Everybody, Frank here.
Okay, let's review. By the title you can tell that this is going to be a review of an end fed antenna. Now, the review part. A wise man once said, write what you know about, and me being an advocate of advanced humor, I'm going to try to combine a little bit of knowledge with a little bit of humor.
A disclaimer. Anywhere on this site, whether it is radio or chickens or pigs, we make no profit off of anything. There has been no gratuity awarded for any product endorsement. For those that do profit off of what they write, great! It is just not our forte.
It's been 3 years since I posted any type of article. A lot happens in three years. I have tried some antennas, some radios, I decided to try out heart surgery. I've now got one of those zippers from stem to stern. Not literally of course. And not being a person of nautical persuasion, I do not know the difference between stem and stern. But for those of you that are interested, I will share information about the bypass at a later date.
At a radio meeting one night, I heard a guy talking about his new antenna, and he was raving about it. Now all this guy does is CW, or morse code, he doesn't even have a microphone attached to his radio. Let me back up here a little. This article is not being written at an entry level knowledge base. I'm sorry. So, if we're speaking of CW and end fed, then you know I'm talking about HF radio. And yes, I know there is some CW on VHF, but that is not what we're talking about here.
So, continuing. I listened to this guy, and he is a senior operator. So I listened for a while, and this guy learned CW from the United States military. And this guy talks CW all over the world. I'll get back to this part of the story later.
Okay. The antenna I'm going to review today is made by MyAntennas.com Yes, that is the name of the company. I will start off by saying I am highly impressed with this product. Are they pricey? Yes. Could you build your own? Probably. And if you would like to do that they will sell you the parts to do so. I bought the EFHW-8010.
It is 130 feet long, resonant on 80/40/30/20/17/15/12/10M. It is rated at 1kW maximum. These are the specifications. If you're not familiar with an end fed, which at the time, I was not, it is basically half of a full wave dipole, in this case, for 80 meters. Because if you remember, the number 468, that is your magic number that you use to figure the length of a half wave dipole. A small example, 468 divided by 3.5 equals 134. 3.5 is the lower end of 80M. So, 468 divided by 3.5 is 134 feet. If you were building an 80 meter dipole, it's full length would be 134 feet, which would be 67 feet on each leg of the dipole.
Now follow me here. Through the miracle of using a balun, using the end fed half wave length antenna, then you can tune all of the afore mentioned frequencies. Or that's how it works in theory anyway. Now I'm going to tell you how it works for me in reality.
Equipment used. My power supply is solar. The radio is an IC-718. I have approximately 100 feet of RG-8X from the radio to the end fed antenna. The feed end of the antenna is at 30 feet in the air, it runs approximately 50 feet to an apex of 40 feet and then continues whats left to a 30 foot height. This works okay for me. Your mileage may vary. I have a power transformer from the electric company about 50 feet away, and the apex of the antenna passes over a metal roof that is about 16 feet from ground level. These are the parameters that I have.
Now. This antenna will not transmit on 160M, but it will receive. I did not check for SWR on 30, 15, or 12 meters because I don't use those. It did work great on 40M, so 15M should also be good. Here's what I got.
All the following readings are SWR.
80M - lower end 1:1.1
80M/75M - right at the higher end 1:2.5
40M - entire band 1:1.1
20M - entire band 1:1.1
10M - lower end 1:1.8
10M - middle and upper part 1:1.4
60M - the 5 channels 1:2.5
11M/CB - 1:2
As you can see, these are all easily tunable without a tuner. But with a tuner, your radio is happier. So, example. If you have a radio with a built in tuner, it would easily tune these numbers. If you have an external tuner like I do, then for most bands I don't even use a tuner, and if I do, it just makes my radio a little bit happier.
Because this is a review of an antenna, I'm not going to discuss the theory of SWR. It's one thing if you're running 100 watts power, and another if you're running a 1000 watts. But if you're looking at this antenna, then you already know the difference.
This company, MyAntenna.com, also provides higher power antennas, just look around. They also sell baluns, RF isolators and other assorted goodies and toys.
Here is a link to eHam.net. I think you will find the reviews impressive.
If you have the space, or the desire, I would highly recommend this antenna. For me, it works. You can also configure it like you would any other dipole. Yes, it is a little pricey and it takes up 130 feet. What do I use it for? I do not contest, nor do I use CW, therefore there is no review of 30 meter. I have made contacts on 80/40/20M, and mostly on 40M. I seldom DX. And I seldom talk, but the reports I receive back are all 5/9, or easily intelligible.
Again, I have no other end fed experience, I have never used a directional antenna, yes I know these are directional, but you know what I mean. For 10 & 11 meters I primarily use a vertical A99.
I would appreciate your feedback, how your antennas are configured and what type of results you get. We're all in this ballgame together, and if we can help out a fellow man, let's please do so. If you have found mistakes in my writings or calculations, please let me know. This is just my experience. I look forward to hearing from you.
My XYL just reminded me that I need to let you know why I do this. First off, I listen. I want to know what's coming down the road. As mentioned earlier, I operate from solar, not my whole house, but all of my radios, and that's what it's for. The system I use is simple. For me simple works better. The man I mentioned earlier that I learned about this antenna from operates all over the world when conditions permit.
In a future article I will tell you about my IC-7300 experience and why I went back to an IC-718. Thanks for being there.
We'll talk more later. 73, Frank