Ape 🦧, you did an exceptional great job with this video. Back in the early 1970’s end fed antennas a very bad reputation of emitting extreme large amount of specious interference especially in close proximity instillation. Living on a farm in rural centerline Texas I didn’t have any problems with them and experimented with many different variations with fantastic results when coupled with a good Unum. I experimented with every type of matching device you could think of, lot of FUN❗️❗️👍✅
@@TheSmokinApe Exactly my predicament now retired and on a small lot on the lake, after I saw you video on the ARRL 1/2 wave dispose I ordered and it will be here on Wednesday and my yard boy said he would string it up for me so I will be back on the air soon. 73. KV5P
Nice video Ape, great audio and dialog! I test using the same method using 2 resistors in series to get about 2,500 Ohms. I sweep the Z value to see how close it stays to 50 ohms on the bands I want. Thanks for the video - great job!
Great explanation. The real point I find that helps people understand what’s going is this. It’s only an end fed “half wave” once. If you cut your wire length for 40mtrs it’s a 40mtr end fed half wave. Past that your working on some “other” multiple of a half wave or “high impedance” that’s close to the 49:1 ratio. These things are awesome especially for quick deployments.
Wow! The "Great" Ape earns another big bundle of bananas in appreciation for another clear and unique approach to illustrating the math behind and application of test gear to impedance matching verification. Just need to know where to send the bananas????
Simple is good -- just built one and will test it with the NanoVNA. Haven't seen anything about testing a bare EFHW without the UNUN - thought of doing that first to determine impedance at height, then making the UNUN to specific match. But decided to just built it as 59:1 - since a little higher than most (30+ one end, 60+ at the other end) -- so seemed better to move toward the 64:1 direction. We'll see how it does.
Just being a Short Wave Listener I set up a Long wire (End Fed) Approx. 60 feet (Max I can run) at first I did not have any balun. I was able to hear the WWVB (60KHz) atomic clock time signal.. So I tried a 9:1 Balun improved things but lost below 500 KHz .. I then Tried a 49:1 (Did not use any Capacitor) as you describe (Big Improvement) 500 KHz to 20 Meters (But still nothing) below 500 KHz is there any way I could get decent coverage from 30 KHz to 30 MHz (Using a Balun) or am I asking for too much.. (I guess a Longer wire) but Can't.. Thanks for this video helping me Understand.
Regarding Impedance: 1 - What is the Resistance "R" value and what is the Capacitive (XC) or Inductive (XL) Reactance of the End Fed Half Wave antenna? 2 - What is the Resistive and Reactive impedance values looking into the 50 ohm port when the 49:1 UnUn is connected to the antenna? i.e. does the UnUn transform both the Resistive and Reactive components of the impedance? Thanks.
I have shown this test with the NanoVNA as part of build videos, I used the RE here because I have done a few videos with it and just thought I would share 👍
When you say the cap is a bypass do you mean it's to bring in those freqs you mentioned better or to make it so they are not possible to be used? Why? If you wanted to build a balun/unun for say a OCF dipole that you wanted to try for 80M -- 10M would you use one? How do you determine the cap size?
I tried the same test with my nanovna. I used a 2400 ohm load. I soldered 16 one percent 150 ohm resistors together. I swept from 6.5Mhz to 30Mhz. My min VSWR was 331! Can the nanovna be used for the same test?
I have just tested my UNUN from HF-kits ( 100 W ) with a 2,4k resistor. The UNUN is expected to be used with a shorty-40 ( 20m and 40m ) later on. At 40m: flat curve 1:45 SWR and at 20m flat curve 1:47 SWR. No capacitor. Test setup, nanoVNA: 20m = 13-15MHz, 40m = 6-8MHz. Would you guys consider it ok?
Good job! Just built one...this simple test jig is a good illustration for testing. I used my Rig Expert AA-55 BT. Now, if RE would only get the BT to work as they promised...Did you get the Unun end off the ground much? Did you ground it or use a pig-tail on it? Not being critical here...just knowing how the ham world differs on doing this. Steve Ellington suggests a ground. But, you know, this same test jig to follow-up this video with the grounding/counterpoise tests would make a great follow-up. 73 de K4FMH
Hey Frank, thanks for checking out the video. It seems like RE is only going to use the BT feature in the sticks moving forward, I do like their products. Typically I use a 17' counterpoise on end feds and tune from there, when it cools off I am thinking about installing a ground rod for this antenna. I did a video on endfed's with and without counterpoises here: ua-cam.com/video/Y7vaXcaeVgM/v-deo.html
@@BarefootBeekeeper I totally get what you are saying, I’m just telling you what they are called. You will find odd / weird naming in all aspects of ham radio, you will also see where a device has multiple names.
Ape 🦧, you did an exceptional great job with this video. Back in the early 1970’s end fed antennas a very bad reputation of emitting extreme large amount of specious interference especially in close proximity instillation. Living on a farm in rural centerline Texas I didn’t have any problems with them and experimented with many different variations with fantastic results when coupled with a good Unum. I experimented with every type of matching device you could think of, lot of FUN❗️❗️👍✅
Thanks Mike! I pretty much am an end fed guy due to the dreaded HOA 👍
@@TheSmokinApe Exactly my predicament now retired and on a small lot on the lake, after I saw you video on the ARRL 1/2 wave dispose I ordered and it will be here on Wednesday and my yard boy said he would string it up for me so I will be back on the air soon. 73. KV5P
@@mikemiles3068 Awesome, keep us updated on the progress 👍
The art skills of a man with power point chops. Great explanation and a question I know I have asked in the past. Thanks Ape.
It’s those questions that drive the channel, thank for all the support Don 👍
Thanks Ape. Easy to follow without a lot of stuff thrown in to complicate the subject. Great to see you put the new analyzer to use.
Thanks for watching Keith, I just try to keep it simple and fun. I’m loving the new analyzer too!
I appreciate your organization, you get the info out without too many digressions. Nice job Mr Ape.
Haha, thanks LC glad you liked it 👍
Ape, that was very well done and I liked the artwork too.
Haha, thanks for checking it out Jose 👍
This is awesome ♡♡♡
I'm one of those people who needs to see the numbers to really understand :) appreciate your showing us this!
🤜👍🤛
Glad it was helpful Aname 👍
Great video Ape, simple and easy to understand. Your lab quality test gear is good too 👍
Haha, thanks for checking it out Hayden 👍
Another great job Ape!
Thanks Chuck 👍
Nice video Ape, great audio and dialog! I test using the same method using 2 resistors in series to get about 2,500 Ohms. I sweep the Z value to see how close it stays to 50 ohms on the bands I want. Thanks for the video - great job!
Hey Steven, thanks for the info and for checking out the video 👍
Great video man, very informative!
Thanks for learning me somethin'
Glad you like it No Code 👍
Great explanation.
The real point I find that helps people understand what’s going is this.
It’s only an end fed “half wave” once.
If you cut your wire length for 40mtrs it’s a 40mtr end fed half wave. Past that your working on some “other” multiple of a half wave or “high impedance” that’s close to the 49:1 ratio.
These things are awesome especially for quick deployments.
Great points, totally agree.
Wow! The "Great" Ape earns another big bundle of bananas in appreciation for another clear and unique approach to illustrating the math behind and application of test gear to impedance matching verification. Just need to know where to send the bananas????
Haha, thanks for checking out the video N3JW 👍
Thanks for that a very clear explanation.
Thanks for watching bretep 👍
Short, clear and SWEET! tnx, KF6IF
Thanks Phil, glad you liked it 👍
Great video
Thanks Thump!
Another awesome video 73
Thanks for watching VE6JTW 👍
Great video.. I thought I was the only other person to own an AA-30 zero!! Not a lot out there for or about it!
Glad you liked it Steve. We’ve been playing with the AA-30 Zero for a few weeks now, it’s a cool project 👍
Simple is good -- just built one and will test it with the NanoVNA.
Haven't seen anything about testing a bare EFHW without the UNUN - thought of doing that first to determine impedance at height, then making the UNUN to specific match.
But decided to just built it as 59:1 - since a little higher than most (30+ one end, 60+ at the other end) -- so seemed better to move toward the 64:1 direction.
We'll see how it does.
That's interesting. Thanks for checking out the video and good luck with the project.
@@TheSmokinApe Thankyou. Down to the last parts before connecting the antenna and extending the mast.
Just being a Short Wave Listener I set up a Long wire (End Fed) Approx. 60 feet (Max I can run) at first I did not have any balun. I was able to hear the WWVB (60KHz) atomic clock time signal.. So I tried a 9:1 Balun improved things but lost below 500 KHz .. I then Tried a 49:1 (Did not use any Capacitor) as you describe (Big Improvement) 500 KHz to 20 Meters (But still nothing) below 500 KHz is there any way I could get decent coverage from 30 KHz to 30 MHz (Using a Balun) or am I asking for too much.. (I guess a Longer wire) but Can't.. Thanks for this video helping me Understand.
Regarding Impedance: 1 - What is the Resistance "R" value and what is the Capacitive (XC) or Inductive (XL) Reactance of the End Fed Half Wave antenna? 2 - What is the Resistive and Reactive impedance values looking into the 50 ohm port when the 49:1 UnUn is connected to the antenna? i.e. does the UnUn transform both the Resistive and Reactive components of the impedance? Thanks.
Well done !
Any reason why you didn't just test with your nanovna, rather than the more expensive and less popular AA device ?
I have shown this test with the NanoVNA as part of build videos, I used the RE here because I have done a few videos with it and just thought I would share 👍
@@TheSmokinApe OK, tnx.
Again, well done.
Thanks AL 👍
When you say the cap is a bypass do you mean it's to bring in those freqs you mentioned better or to make it so they are not possible to be used? Why? If you wanted to build a balun/unun for say a OCF dipole that you wanted to try for 80M -- 10M would you use one? How do you determine the cap size?
Hey Neal, the cap lowers the SWR on the higher bands. For an OCFD you use a 4:1 transformer which doesn’t use a cap 👍
I tried the same test with my nanovna. I used a 2400 ohm load. I soldered 16 one percent 150 ohm resistors together. I swept from 6.5Mhz to 30Mhz. My min VSWR was 331! Can the nanovna be used for the same test?
Yes, that's how I do the test with the PC software.
I have just tested my UNUN from HF-kits ( 100 W ) with a 2,4k resistor. The UNUN is expected to be used with a shorty-40 ( 20m and 40m ) later on. At 40m: flat curve 1:45 SWR and at 20m flat curve 1:47 SWR. No capacitor. Test setup, nanoVNA: 20m = 13-15MHz, 40m = 6-8MHz. Would you guys consider it ok?
I would. But I am curious, why no cap?
Good job! Just built one...this simple test jig is a good illustration for testing. I used my Rig Expert AA-55 BT. Now, if RE would only get the BT to work as they promised...Did you get the Unun end off the ground much? Did you ground it or use a pig-tail on it? Not being critical here...just knowing how the ham world differs on doing this. Steve Ellington suggests a ground. But, you know, this same test jig to follow-up this video with the grounding/counterpoise tests would make a great follow-up. 73 de K4FMH
Hey Frank, thanks for checking out the video. It seems like RE is only going to use the BT feature in the sticks moving forward, I do like their products. Typically I use a 17' counterpoise on end feds and tune from there, when it cools off I am thinking about installing a ground rod for this antenna. I did a video on endfed's with and without counterpoises here: ua-cam.com/video/Y7vaXcaeVgM/v-deo.html
RR...sorry I had missed that!
No worries, thanks for checking out the channel 👍
Great job Ape. What box are you using for your rigexpert?
Thanks Joseph, www.thingiverse.com/thing:4921777 👍
@@TheSmokinApe what code did you use for the uno?
@@krazyjojo1 ua-cam.com/video/RgokZGJLuE8/v-deo.html I cover it here
Very good Video and good or Unserstand for me because i'm from Germany
Thanks IGF, glad you liked it mein brudder. Mein deutsch ist nicht ser gut...
How do we test if there is only a positive terminal, no ground?
You could connect to the coax shield.
"End fed half wave dipole"?
Surprisingly enough that’s the correct name for it. Thanks for checking out the video 👍
@@TheSmokinApe but the "di" part of "dipole" means it has two parts, whereas an end fed antenna only has one...
@@BarefootBeekeeper I totally get what you are saying, I’m just telling you what they are called. You will find odd / weird naming in all aspects of ham radio, you will also see where a device has multiple names.
How much power loss in the transformer?
I didn’t measure this one for power loss but have measure many other on the channel 👍
👍👍👍...
Thanks for checking in DK5ONV 👍
Your unun is showing
I hate when that happens!
That subscribe button popped up. I clicked it. Now I'm un-subscribed and can't watch any of your videos again. Please help.