Keeping Your Dipole Well Fed (
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- Опубліковано 15 вер 2024
- Oggie Don Gardner, KC3RDV, has questions about feeding a dipole. He doesn't want the coax hanging down in the middle of the yard and is looking for options. We look at center-fed dipoles, off-center-fed dipoles, and end-fed dipoles.
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hi dev nice to see you.
well done Picasso. Keep the great videos coming
Dave, The 49:1 auto-transformer is not a Balun -- it's an Unun... Ken WA8FCI
Good catch!
Not when you're searching ebay for one it isn't. ;)
Where the lmr 400 cable rpsma fixed connector screws on to the back of the transmitter
Always use both feet when walking
Building vertical dipoles. Two segments of one element be same diameter and length?
Clears up a misconception I've had for years...thanks.
A 49:1 balun on ebay is about $30 and will work fine, or you can make one for $15.
Thanks for another great show . Your answers were plain and eazy to understand. KD9HWH said that.
What’s the “3 feet from house” for? Lightning? Can it be 4 or more feet? My inverted dipole ends about 5-6 feet from my house.
I couldn't get myantnana to match. It ended on the ground and I don't know where to start .
Does electrical installation tape effect the signal being received and sent at the transmitter if you put tape at the connection. Please can you let me know buddy I would appreciate it
Thx Dave - looking forward to the Isotron!!
I heard somewhere else that end fed horizontal antennas can cause more of a shock hazard inside of the shack than non end fed antennas. Is that true? If so, what should one do to avoid that? Thank you.
How does the antenna perform when the feed point changes? I always put mine in the center because I imagine that would be the best spot because it’s the shape of the radio wave.
I use a myantennas 4010 EFHW run horizontally from the corner of an elevated deck to a tree. No counterpoise. Very stealthy in my HOA and it works GREAT! 73 de KC3NFV
If MyAntennas advises to put a pole up in the middle of Their end-fed antenna, You can just as well use a normal dipole and feed it in the middle, using a balun also. Just use a piece of low stretch wire. This will be much cheaper than the 9/1 or EFHW 49/1 transformer on a end-fed antenna.
Dave, why does that dude walk across your screen in your videos? 😆Thanks for keeping me company with your brilliance.. safe flying my friend!!
I've had my end fed up for about a little over a year now and I have been very happy with it.
That being the case you better believe I still checked against this description! LOL
Thanks as always Dave and 73 de N2NLQ
It may be true that it doesn't matter where you feed it if you match it to get all the power to the antenna. But for someone like me that is new and living on Social Security, matching it to get all the power to the antenna is not easy. Saving for over a year or more to get HF radio, then Saving longer to get what it takes to get the things needed to match the impedance and what ever needed to get the maximum power to the antenna is a bit much! A center feed fan is easy to make and put up. Yes you need to be smart enough to not cut the coax when cutting the grass. But if you can pass the tests to get your license you should be able to know not to cut your cable when cutting the grass. Each person has what is needed. I need the lowest price! I have some wire and a way the antenna up high. I may have an antenna up before I can get a radio to put on it.
Congratulations on taking the DIY route. I can't believe people pay such ridiculous prices for a commercial wire antenna, the price of lazyness.
@@RobB_VK6ES I don't have the money! If I can't do it on the cheap I can't do it! Besides it is good learning!
How much power is lost in the balun?
If the transformer is WELL designed for purpose losses will be small.
At qrp levels a lot cause you don’t have a lot but at 100 watts it ain’t much at all.
@@forgetyourlife Can't get much more QRP than a receiver and designers have little aversion to including coils and toroids into them. It is all proportional, a given dB loss is the same % loss at uV or MW when no resistive losses occur and the core is not magnetically saturated. In fact theses two factors play an increasing counter productive role as power is increased. You might also include the wide spread adoption of the EFHW by QRP portable operators as a counter argument to your assertion.
@@RobB_VK6ES the wide spread adoption of efhw by the portable crowd is mainly ease of use. But these debates can go on forever either way. There’s always someone who hits a guy with a tribander 80ft in the air 10 states away and thinks their 26 gauge random wire is “gettin out”
Hi Dave,
Very good...
Speaking of antennas, did you get your mfj loop back on the air? Hopefully working well.
Also, what happened to you Stepp-ir? You said it was out of commission a few vids back, but didn't elaborate.
Will the end fed dipole with 49:1 balun radiate as efficiently as a center fed dipole?
Yes
49 to one Balun is a whole bunch. Can many be added like resistors, or inductors in series which I suspect, or are they like capacitors in series? 73 AG7MW
It makes little sense to connect a number of units up. To effect different transformation ratios simply change the turns ratio of a single transformer ( Dave mistakenly calls it a balun here, the EFHW is not a balanced load. The core is not a balun, the core and windings serve as a transformer an auto-transformer to be exact) It's sole purpose is to transform the 50 ohm impedance of the feedline to whatever feedpoint impedance the antenna is presenting in order to minimise SWR. Remember the impedance transformation is proportional to the turns ratio^2 so a 1:1 ratio gives a transformation of 1x, 2:1 gives 4x 3:1 gives 9x 4:1 gives 16x etc.
As always, an interesting vid & thanx! 73 de .--/.-/....-/./.-../.-- in TN dit dit 😃