e07a sounding like batman today

Thanks, friend. That fixed my problem.

there is no such list of alternative devices, only the PortAudio checkbox which does not work...

Might be easier to connect the cable first by inserting it into the bottom of the pipe, then out to one side.

I made exactly this, but for some reason, battery gets discharged after a couple months even if I take the battery off after charging it to 100%

👏👏👏👏👏👏👏

STOPPED WATCHING , ATUPID MUSIC… 1 DISLIKE, NEVER SHOW AGAIN

I love the weird and wonderfuls like this.. Fantastic

That fake stubby diamond with SWR 2.66 on 420mhz, will it damage the radio itself?

Salut, Merci pour ces test comparifs. ✌️ Il faudrait au préalable, mesurer la bonne longueur de câble coaxial permettant de reproduire la même impédance d'un bout à l'autre du coax. ( calculer pour une seule fréquence donnée) N'est-ce pas un multiple impaire de demie longueur d'onde pour la mise au point d'une antenne ? Ça permet d'avoir impédance à peu près exacte au bas de l'antenne sans trop la perturber. Vous me direz ce que vous en pensez ? Merci Après, qd l'antenne est collée au pocket, il y a certainement le petit plan de masse à prendre en compte ? Mais tout ça peut déjà donner une idée de comparaison de ttes ces antennes. 😉 Merci, en l'attente de votre, ou d'une réponse. Salutations 😉

Thank you!!!❤

Е07

Interesting test and you spend much effort. Some results are astonishing though, esp. for the Nagoyas which are known to perform quite well normally. Did you calibrate your NanoVNA properly directly before the measurement? Also the ground plane seems to be too large for real life comparison - most antennas are optimized for handheld function without such a groundplane so this might bring in some bias. Also as other mentioned the adapter you use will bias the performance. Some SWR are 3..5 or even higher! And characteristic impedance varies from 30...150 Ohm which is far off the typical 50 ohm. I think this test needs an update with optimized conditions and a final result summary with some comments 🙂

Excellent video

helpful video, thank you.

The addition of the adapter to go from BNC to SMA on the first antenna adds other factors to the equation. One, the adapter lengthens the antenna by 3/4 inch, thereby changing the antenna's resonant length. Two, the adapter introduces loss into the RF path. You have to take these factors into consideration when making precise measurements.

Verbatim instructions from the dead link in the description for "Zed Zed's workshop: a simple 2 m / 70 cm vertical dipole antenna": A Simple 2 m/70 cm Vertical Dipole Antenna: This easy to build dual band VHF/UHF antenna makes a great project for the new ham that is ready to get on the 2 meter and 70 centimeter amateur radio bands. It can be mounted on a roof top for use as a fixed antenna and it also folds conveniently for travel making it an excellent backpack antenna. The design is simple and so is construction. Construction: The antenna elements are made of 1/8" diameter stainless steel rod. Each rod is bent into a tight "U" shape and fastened to the acrylic plexiglass boom with stainless steel hardware. Flat washers large enough to fit across the gap in each element are used to hold the elements in place. A piece of 1/4" thick cast acrylic plexiglass, 18" long and 2-1/2" wide, is used for the boom. Drill the holes in the boom as shown in the diagram. The position and hole size for the mast mounting clamp is determined by the size and width of the clamp or U-bolt that you use. I used a TV antenna mast clamp that fits a 1-1/4" mast. Probably the hardest part in making this antenna is bending the stainless steel rod. But the rod can be bent without heating it first with a torch. I was able to bend the rod by placing it in a bench vise. The tricky part is to bend two pieces of rod that come out looking similar is shape. Use two pieces of stainless steel rod that are longer than needed then trim them to correct lengths after the rod has been folded into a U shape. Make each element section as shown in the next diagram. The hardware for mounting the antenna elements to the boom is also used to connect the feed line to the antenna. The coaxial cable center and shield are separated and the leads kept as short as possible. Crimp-on ring connectors, with the plastic insulation removed, are soldered to the ends of the cable. The coaxial cable center lead is connected to the top section and the shield is connected to the bottom section of the antenna. This antenna was fed with RG-8X (Mini 8) 50 ohm coaxial cable. The feed line used was a random length and was not cut to any specific length. I used mostly all #6 stainless steel hardware to attach the antenna elements to the boom. Start by placing an external tooth lock washer on a machine screw then insert it into the hole drilled in the boom. Next install a flat washer, then the antenna element, then another flat washer. The ring connectors with the coaxial cable attached go on next then finally fasten with a split lock washer and a wing nut. Repeat for the opposite side. Tuning the Antenna: To tune the antenna for minimum SWR simply loosen the wing nuts and slide the antenna elements in or out as needed. Keep in mind that changes made to one band will affect the other band. For example if you shorten the 2 meter length then you also shorten the 70 cm length. Some fine tuning by again trimming either the 2 meter or 70 cm sections may be done if desired but this should not be needed. All stainless steel element mounting hardware. Use larger size hardware if flat washers do not extend across both sides of the antenna element. Part list: 2 each 1/8" Stainless steel rod, 3' (.9 m) long. Acrylic Plexiglass, 18" x 2-1/2" x 1/4" (45.7 cm x 6.4 cm x 7 mm). 2 each #6 x 32 x 1" (25 mm) Machine screws. 2 each #6 x 32 Wing nuts. 4 each #6 Large flat washers. 2 each #6 Split lock washers. 2 each #6 External tooth lock washers. 2 each #6 Crimp-on ring connectors. Mast mount clamp. Plastic cable tie or small U-bolt. (I could not include the picture diagrams as KZbin does not allow links. One photo shows the measurements for the rod. The steel rod should be exactly 18 5/8 inches in (47.3cm) length. You need to bend the rod so there is exactly 6 ¼ inches (15.9cm) for the short end. The bend should be 3/8 of an inch (10mm) in width.)

Thank You!

Fake Diamond 805 . Fake Nagoya 771, ... ”Probably”clones? I have real ones from a professional store. There are visible differences next to the swr data.

Good content, very very helpful. I'm doing all three methods. Thanks again.

Super helpful. Thanks

Great video! Timestamps: 01:51 Nagoya NA-773 04:21 Nagoya NA-771 06:20 Sainsonic INF-641 (Baofeng GT-3 Radio) 08:10 TYT MD-390 Radio antenna 09:14 TYT MD-390 Radio additional antenna 10:36 Anytone AT-D878UV Radio antenna 12:42 Diamond RH901S 15:05 Diamond SRH805S 18:02 MMDVM Hotspot antenna 21:02 OPPXUN TX-PHD669C-F 24:30 Yaesu VX-2 antenna

You don't know how to test ht antennas, you just think you do. Wasted my time watching👎

What centimeters of the antenna?

Hi how long must uhf elements be ...

Good idea

Thank you ! Great support!

This E06. It just sound weird beacuse of cars or others technics being too loud or low signal

Can you please show us how to make component cables on ps2

Very nice 👍

Do you have a table with summary?

Nice circles and lines... but could we have a results recap with top list ?? I still don't know which ones are better cause I didn't know I need to write on paper the numbers !!! Also, you may cut the screen with multiple tests at the same time to shorter the video ; my beer is hold now !!

Why use a fake Nagoya 771?

those are fake nagoya antennas btw the ones with blue writing

ماذا كان افضلها لم افهم شي الرجاء الافادة

How did the police know soo quickly he made a home antenna? 🤔

What do you mean by hot wire ? Is it the innermost copper wire in a coaxial cable or the outer conductive mesh ?

What are the measurements of the PVC tube that is attached to the mast? Thank you

That was twenty-one seconds of usable information, eight minutes of watching you fiddle with an antenna analyzer, which, I suppose, wouldn't have been so bad if I could understand what you were saying.

The Nagoya is a knockoff. 😆

英國版“The Pip”

陰間電台

THANK YOU! THANK YOU SO GOD DAMN MUCH! AAAAHHHHH IVE BEEN TRYING TO DO THIS ALL DAY AND ITS BEEN SO ANNOYING, BUT YOU JUST TOLD ME HOW! THANK YOU!

just did it in 5 minutes, and I've used cardboard instead of the 3d printable model. Thanks!

Any recommendation on the type of battery to use? I see you use a much A than the original one, what are the implications? (Also where to get these replacement internal batteries - looks like RC type)

Nice setup with good counterpose/earth plane you have there. However, for the smaller antennas the counterpose may be too large, compared to a handheld radio (where they are supposed to be used, with the dipole-principle in mind). I wonder how the small Diamond 805 would measure if you connected it directly to the VNA, w/o the counterpose rig. Just my 50 cents. Thank you for the effort measuring these antennas :)

WOW

E07 But badly tuned and crappy signal

Hello, good morning. Sir, I bought a Tektronix 2465 300 MHz oscilloscope. It turns out that when turning on it takes a while for the flash or the image to appear, it is an analog oscilloscope, could you help me to know if the fault is serious or if it is due to lack of maintenance, The equipment turns on but the screen is displayed after a long time, help me to know if it is something serious please

Thank you so much for this video man.