you have by far made the most informative video I have seen all week sir,Thank you for that effort I was happy to subscribe to your channel. cheers from JCinAuz
Milan thanks for sharing, great channel! Please what is the formula to obtain 12mm? I calculated 1/4 lambda of 5.8GHz and obtained 12,9mm. Did you applied velocity factor and rounded the number? What have you considered? I want to make a 5GHz antenna with 0.78mm conductor. Thank you!
Thanks. I did not say that I don't like this VTX, but I am waiting to arrive. Probably I am again too tired to make statements and think coherently - whole night messing with something. :D Thank you in advance for reporting results. If you have panel antenna, start from 3 km and beyond. :D Enjoy!
Use panel antenna. If not sold out, I recommend "AOE" panel antenna from myrcmart: www.myrcmart.com/advanced_search_result.php?search_in_description=1&keywords=panel+5.8&x=0&y=0 RP-SMA is long time ago sold out, so SMA + some adapter is much better than other antennas. Next good antenna is DalRC, and the worst (read: garbage, don't buty!) is RCX08. All linear polarization. For long range flight, put on some tripod or as I did on my helmet FPV gear. For close proximity, it has sufficiently spread side lobes for good reception without need to moving antenna. Please take look at this video: ua-cam.com/video/7hGs4RaWLBk/v-deo.html Notice that when flying vehicle approaches me, I do not move at all. Just now and then move my position. Also, this flight is 13 minutes with single battery. I should to build another one if I get some time. This one ended on the bottom of the Bosut river... eh...
Please be quick. This antenna is so good... and I am afraid that price will rise, take look: www.ebay.com/itm/AOE-5-8GHz-15dBi-High-gain-Panel-Antenna-For-FPV-5-8Ghz-High-Range-SMA-/252062085833?rmvSB=true $23.40 US instead of just $4.99 US on myrcmart!!! Someone bough whole bunch and now re-selling.
And! DO NOT buy Aomway panel antenna at any cost! www.hobbywow.com/en-aomway-5-8ghz-14dbi-high-gain-flat-fpv-receiver-antenna-p240002.htm This is so bad antenna, that I can't imagine why people buy it at all. Probably because of name, but this Aomway is more like NoWay to get signal antenna. :D
Love it. What 2.4 transmitter do you use for H8 mini boards? I want a cheap alternative (other than the devo) that i can modify. I have built and use your antenna's very light and work fantastic. Thank you
Bayangtoys X8, because it has the same "Bayang" protocol. It also has better mechanical properties (more precise stearing), and more ergonomic properties. The output power is the same (1 mW or less), since it uses the same RF module - which has chip which is pin compatible, but different set of registers (can't be used nRF24L01 directly). So, Bayangtoys transmitter can run Eachine H8 and small Eachine H8 transmitter can run Bayangtoys quad. Unfortunatelly, it is out of stock at the moment at www.gearbest.com/rc-quadcopter-parts/pp_299986.html?wid=21 Maybe somewhere it is possible to buy it separately, without need ot buy BT X8 + TX, but at the moment, I am not aware of such store. Also, this BT X8 transmitter has bigger housing, thus easier to open and manipulate. On my video about BT X8, you can see how to make really good antenna, where with converting both: quad and remote, you can go over 1 km with FPV setup on BT X8 (not possible with Eachine H8, simply because can't lift that much weight, even with small, 4 grams VTX on it). Also, enjoy in my video of test range of modified BT X8 - my personal record with this particular set is 1.1 km.: ua-cam.com/video/STMtrUg1QYo/v-deo.htmlm38s
Is th syma x5 the same thing branded differently? www.ebay.com/itm/Syma-X5SC-X5SW-X5C-X5C-1-RC-Quadcopter-Spare-Part-2-4G-RC-Transmitter-/252381529486?hash=item3ac31c858e:g:iR0AAOSwYmZXLbSN
Because I soldered thin wire so that it is fixed to channel 5, which is found by experiment to be cleanest possible (avoiding remote interferences). At this moment of making this video, had no micro-switches (dip), but now I have.
Accroding to table, you sellect your channel. But! There is counterintuitive thing - connecting to ground means 0 (zero), not one (1). It has pull up resistors, so what you need to do is solder ... for example, channel 5 is soldering CH1 and CH2 to the ground. Then CH3 remains high, or 1. It confuses many people. www.banggood.com/FPV-5_8G-10mW-Wireless-Audio-Video-Transmitter-Module-TX5813-p-84761.html?p=EH10221611330201505Q Scroll down, there is a table with channels.
This is what I got so far, I have soldered the channel ports to the ground of the antenna. postimg.org/image/xjsgafrxf/ and postimg.org/image/l51emlhtl/
That looks good. Just be sure that you have video signal, otherwise transmitter will not start. On your picture, there is yellow wire from the cable, but not ground wire to the camera.
Are you using the ERP charts from the actual antennas you built? How did you measure SWR? or are you simply going by actual range tests using your Monitor to measure (static, interference) loss of signal at X distance?
No real ERP chart, just speculative. And, I have no way to measure SWR at 5.8 GHz. Yes, I do testing of antennas by range testings. So far, one video ua-cam.com/video/PlKE6jmA72k/v-deo.html is just 3 km with 25 mW VTX and panel antenna, but other day got better results with changing position of the VTX on the roof, so that tree line is not in between. Got last traces of video at about 5 km. Also, shared design with other local people who confirmed that this antenna is really good. If you do exactly as is on video, I can garanty you good video quality with vertical linear polarization. What can I do else to convince you and other people to make such simple, yet effective antennas for VTX, but also other antennas for 2.4 GHz for remote? Thanks.
You don't need to convince me at all. I am quite aware of how antennas work and have made my own, and real range tests on copter are sometimes better than charts and measured with RF equipment, so If you say you are getting better range I believe you, just by watching and listening to you. I have made some antennas of my own by observing and applying Antenna Design Theory carefully but by also tweaking the shape of the antenna to get max range gain. I was just wondering what your reference material was because to do a proper antenna you do have to understand how waves propagate and how to properly calculate wavelength for a given frequency. Understanding materials and how inductive and capacitive elements work as well as impedance matching in AC circuits is key in making a proper antenna. Most of the antennas that come with the toy grade quad-copters are never the same for the same given product, and by checking and re-measuring for the given wavelength at that frequency, you can fine tune it better, but understanding how to make your own is even better.
The main issue people getting wrong with antenna design is in direct math calculating 1/4 lambda, ignoring or not knowint that any conductor has its own "velocity factor" or as I call it "shortening factor". Now, I have no proper mathematic expression for calculating this facor, but rather old book on croatian (similar like ARRL book), where is many tables for calculating relationships between thickness of the radiating element vs. wavelength. Also, velocity factor is important for doing proper cable length, as is odd multiplication of 1/4 lambda (1*1/4, 3*1/4, 5*1/4...), because this trick ensure impedance matching in the case that antenna or device are impedance miss-matched. 1/4 lambda, signal which has high SWR, just goes back out of phase (now 1/2 lambda when back), thus "cancelling out" unwanted SWR. For short cables it is easy to measure, not for long cables. Also, many people does not see the importance of sleeve part. Instead me repeating all of this (or I should make video about that at some point), here is why: en.wikipedia.org/wiki/Dipole_antenna Please scroll down to almost end of the page. BUT!!! Also, people are NOT aware that this sleeve element is bad dipole element - there MUST be another 1/4 lambda wire, even if it is so close to this sleeve. In DC or low frequency domain, this does not make any sense, but at resonant frequency it is very important. I did test with just 1/4 lambda piece of radiator and just sleeve - not as good as with added 1/4 lambda wire very close to this "inverted shield" part of the coax. Many receiver (even expensive ones) come with just radiating part and brass sleeve, without anythign attached. Or, even worst - it comes with just piece of random length coax and central wire of 1/4 lambda (such is FrSky receivers, cheaper versions). Someone asked my why with 60 mW transmitter he loses range aftrer 300 meters for ZMR250... and after convincing him ti make "proper" antennas, he never again lost range no matter what, even in dense forest.
There is a lot of good information that is hidden in books in the old countries. Many people just rely on everything that is placed on the internet. One must be prudent with the information on the internet, especially that which is placed in sites that are owned and controlled by companies that hold monopolies on audiences' attention.
do i spy a cb or ham boy here? i bet a swr meter for 5.8ghz is £££! among a variety of cb antennas ive made, ive made a ground plane antenna like in this video for 446mhz and it works very well, made the main element and the radials slightly too long as you should in initilal building and got my swr down to 1.1 with careful trimming. i dont know the range of it as its only been pushed to 10 miles so far but was crystal clear with no static what so ever using 5w at both ends and one end on a rubber duck! no signal meter as both of us were using a HT. range is considerably further than 10 miles based on the quality when we tested it.
Very interesting :) What kind of polarization is it? For answering your question at the end, the video is not too long lol I stopped using two separated batteries on my quads and i simply use LC Power Filter now for reducing the noise, i am pretty sure that will be for sure a pretty piece of cake for you to buid some lol
It is vertical polarization. I hate circular, had many problems with cloverleaf antennas, somewhat good experience with helical, but overall feeling is that - I just fall in love with vertical polarization. Horizontal has difficulties in the case that quadcopter turns 90 degrees, and second thing is that ground reflects slightly better horizontal polarization, which can make "multi-pathing" even worst (constructive or destructive interference). Yes, filter is okay, but if I need to use big capacitors and ferrite choke, then it gains weight. So instead, small battery for VTX and camera... I don't know. I will try it at some point. Thank you for reminder.
***** Yes you are right but honestly the weight compare to an extra LIPO is not the same, most of my LC Filters with big capacitor don't weight more than 14g so for me the choice was pretty clear at the end lol Keep it up the great work and thanks for sharing your passion with us :)
Very useful videos on antenna! Can you explain more why you don't like cicrular polarized video signal? Also, in the other video on the 2.4ghz antenna mod, I see you made a dipole antenna with balun. But on rcgroup, seems that people say they get best range with just the whip monopole with the balun. Very interested in hearing your comment on this.
I was about to make my own antenna's. I think I understand correctly that you achieved over a 1000 meters with jst 25mW vtx ? That is quite awsome. This antenna is even better ? I am really curius about the result. Very good video. Glad you made it ! Thanks!
Yes, but consider that at other end is 4 x patch antenna panel, directed antenna. With this combination (and yes, just 25 mW VTX), later got signal at 3 km, and at another not documented case 4.5 km. ua-cam.com/video/PlKE6jmA72k/v-deo.html
Thank you very much! I made this antenna for my AIO FPV cam from Eachine QX90C, replaced original clover. With original clover range was around 40-50 meters (25mW) , with this antenna I flew more then 100 meters away and signal was good and image was OK. Will make same for my Eachine TX03 AIO camera probably.
Please take look at my web page, scroll little bit down, there is math: wildlab.org/index.php/2016/03/02/tutorial-how-to-increase-range-of-your-quadcopter/
And if you think about camera I am recording video, this is smartphone, Samsung Galaxy A5. Good camera, but has problem with auto focus. Audio is in most situations also good, but if it is set to something like auto-filter option, which do great job in filtering stray audio noises for phone puprose, the same filter make recording on camera less good option, since it constantly change some parameters.
This book I have is from Božo Metzger, "Radio priručnik za amatere i tehničare", published 1983 in Beograd. He translated and included many articles from ARRL Handbooks, maybe something still exist here: www.arrl.org/handbook
Nice, its good but i don't know croatian... :-) check about this... www.apparentlyapparel.com/uploads/5/3/5/6/5356442/_____practical_antenna_handbook_fourth_edition_carr.pdf
Has anyone tried to make a antenna like this with coaxial cable found in laptops,tablets and phones? I guess the cable found in laptops is better from a rigidity point of view. Anyway I would be grateful for some input. Thanks in advance.
you have by far made the most informative video I have seen all week sir,Thank you for that effort I was happy to subscribe to your channel.
cheers from JCinAuz
Thanks. Subbed to your channel too.
Diameter size cable coaxial brother ?🙏
could i just use a crossfire rx ufl antenna as my vtx ufl antenna?
Milan thanks for sharing, great channel! Please what is the formula to obtain 12mm? I calculated 1/4 lambda of 5.8GHz and obtained 12,9mm. Did you applied velocity factor and rounded the number? What have you considered? I want to make a 5GHz antenna with 0.78mm conductor. Thank you!
To get lower value, you should include some geometry,... some equivalent of velocity factor.
More math at: wildlab.org/index.php/2016/03/02/tutorial-how-to-increase-range-of-your-quadcopter/
Thank you!
Wow. Used it on my tiny whoop and now I can fly upstairs fine
Thanks.
Before, I would fly upstairs and immediately loose signal. But now I have good connection. Before I had 79-80 rssi but now I have 87-91 rssi at max
Amazing, I will do this for my 200mw FX758 tx. Is this the one you don't like ?
I'll report back results.
Thanks a lot !
Thanks. I did not say that I don't like this VTX, but I am waiting to arrive. Probably I am again too tired to make statements and think coherently - whole night messing with something. :D
Thank you in advance for reporting results. If you have panel antenna, start from 3 km and beyond. :D Enjoy!
What shall I use on the receiver with this antenna ? make the same antenna for the receiver ?
Use panel antenna. If not sold out, I recommend "AOE" panel antenna from myrcmart: www.myrcmart.com/advanced_search_result.php?search_in_description=1&keywords=panel+5.8&x=0&y=0
RP-SMA is long time ago sold out, so SMA + some adapter is much better than other antennas. Next good antenna is DalRC, and the worst (read: garbage, don't buty!) is RCX08. All linear polarization. For long range flight, put on some tripod or as I did on my helmet FPV gear. For close proximity, it has sufficiently spread side lobes for good reception without need to moving antenna. Please take look at this video: ua-cam.com/video/7hGs4RaWLBk/v-deo.html
Notice that when flying vehicle approaches me, I do not move at all. Just now and then move my position. Also, this flight is 13 minutes with single battery. I should to build another one if I get some time. This one ended on the bottom of the Bosut river... eh...
Please be quick. This antenna is so good... and I am afraid that price will rise, take look: www.ebay.com/itm/AOE-5-8GHz-15dBi-High-gain-Panel-Antenna-For-FPV-5-8Ghz-High-Range-SMA-/252062085833?rmvSB=true
$23.40 US instead of just $4.99 US on myrcmart!!! Someone bough whole bunch and now re-selling.
And! DO NOT buy Aomway panel antenna at any cost! www.hobbywow.com/en-aomway-5-8ghz-14dbi-high-gain-flat-fpv-receiver-antenna-p240002.htm
This is so bad antenna, that I can't imagine why people buy it at all. Probably because of name, but this Aomway is more like NoWay to get signal antenna. :D
Love it. What 2.4 transmitter do you use for H8 mini boards? I want a cheap alternative (other than the devo) that i can modify. I have built and use your antenna's very light and work fantastic. Thank you
Bayangtoys X8, because it has the same "Bayang" protocol. It also has better mechanical properties (more precise stearing), and more ergonomic properties. The output power is the same (1 mW or less), since it uses the same RF module - which has chip which is pin compatible, but different set of registers (can't be used nRF24L01 directly). So, Bayangtoys transmitter can run Eachine H8 and small Eachine H8 transmitter can run Bayangtoys quad. Unfortunatelly, it is out of stock at the moment at www.gearbest.com/rc-quadcopter-parts/pp_299986.html?wid=21
Maybe somewhere it is possible to buy it separately, without need ot buy BT X8 + TX, but at the moment, I am not aware of such store. Also, this BT X8 transmitter has bigger housing, thus easier to open and manipulate. On my video about BT X8, you can see how to make really good antenna, where with converting both: quad and remote, you can go over 1 km with FPV setup on BT X8 (not possible with Eachine H8, simply because can't lift that much weight, even with small, 4 grams VTX on it). Also, enjoy in my video of test range of modified BT X8 - my personal record with this particular set is 1.1 km.: ua-cam.com/video/STMtrUg1QYo/v-deo.htmlm38s
Thanks for the information!
Is th syma x5 the same thing branded differently? www.ebay.com/itm/Syma-X5SC-X5SW-X5C-X5C-1-RC-Quadcopter-Spare-Part-2-4G-RC-Transmitter-/252381529486?hash=item3ac31c858e:g:iR0AAOSwYmZXLbSN
You are welcome.
Syma X5 has completely different protocol, if you asked. It can't be used with BT X8.
HI, CONGRATS! do you know what were the different dimensions to match a 2.4 ghz stuff>?
?
wildlab.org/index.php/2016/03/05/the-ultimate-wifi-antenna-at-2-4-ghz/
wildlab.org/index.php/2016/03/02/tutorial-how-to-increase-range-of-your-quadcopter/
Hi, I didn't see anything attached to your channel ports, no DIP switch or anything? How are you able to receive signal from video receiver?
Because I soldered thin wire so that it is fixed to channel 5, which is found by experiment to be cleanest possible (avoiding remote interferences). At this moment of making this video, had no micro-switches (dip), but now I have.
So to get channel 5 you just plugged in port 3? I have trouble seeing, but where do you solder the ports 1,2,3 into?
Accroding to table, you sellect your channel. But! There is counterintuitive thing - connecting to ground means 0 (zero), not one (1). It has pull up resistors, so what you need to do is solder ... for example, channel 5 is soldering CH1 and CH2 to the ground. Then CH3 remains high, or 1. It confuses many people. www.banggood.com/FPV-5_8G-10mW-Wireless-Audio-Video-Transmitter-Module-TX5813-p-84761.html?p=EH10221611330201505Q
Scroll down, there is a table with channels.
This is what I got so far, I have soldered the channel ports to the ground of the antenna.
postimg.org/image/xjsgafrxf/ and
postimg.org/image/l51emlhtl/
That looks good. Just be sure that you have video signal, otherwise transmitter will not start. On your picture, there is yellow wire from the cable, but not ground wire to the camera.
Are you using the ERP charts from the actual antennas you built? How did you measure SWR? or are you simply going by actual range tests using your Monitor to measure (static, interference) loss of signal at X distance?
No real ERP chart, just speculative. And, I have no way to measure SWR at 5.8 GHz. Yes, I do testing of antennas by range testings. So far, one video ua-cam.com/video/PlKE6jmA72k/v-deo.html is just 3 km with 25 mW VTX and panel antenna, but other day got better results with changing position of the VTX on the roof, so that tree line is not in between. Got last traces of video at about 5 km. Also, shared design with other local people who confirmed that this antenna is really good. If you do exactly as is on video, I can garanty you good video quality with vertical linear polarization. What can I do else to convince you and other people to make such simple, yet effective antennas for VTX, but also other antennas for 2.4 GHz for remote? Thanks.
You don't need to convince me at all. I am quite aware of how antennas work and have made my own, and real range tests on copter are sometimes better than charts and measured with RF equipment, so If you say you are getting better range I believe you, just by watching and listening to you. I have made some antennas of my own by observing and applying Antenna Design Theory carefully but by also tweaking the shape of the antenna to get max range gain. I was just wondering what your reference material was because to do a proper antenna you do have to understand how waves propagate and how to properly calculate wavelength for a given frequency. Understanding materials and how inductive and capacitive elements work as well as impedance matching in AC circuits is key in making a proper antenna. Most of the antennas that come with the toy grade quad-copters are never the same for the same given product, and by checking and re-measuring for the given wavelength at that frequency, you can fine tune it better, but understanding how to make your own is even better.
The main issue people getting wrong with antenna design is in direct math calculating 1/4 lambda, ignoring or not knowint that any conductor has its own "velocity factor" or as I call it "shortening factor". Now, I have no proper mathematic expression for calculating this facor, but rather old book on croatian (similar like ARRL book), where is many tables for calculating relationships between thickness of the radiating element vs. wavelength. Also, velocity factor is important for doing proper cable length, as is odd multiplication of 1/4 lambda (1*1/4, 3*1/4, 5*1/4...), because this trick ensure impedance matching in the case that antenna or device are impedance miss-matched. 1/4 lambda, signal which has high SWR, just goes back out of phase (now 1/2 lambda when back), thus "cancelling out" unwanted SWR. For short cables it is easy to measure, not for long cables. Also, many people does not see the importance of sleeve part. Instead me repeating all of this (or I should make video about that at some point), here is why: en.wikipedia.org/wiki/Dipole_antenna
Please scroll down to almost end of the page. BUT!!! Also, people are NOT aware that this sleeve element is bad dipole element - there MUST be another 1/4 lambda wire, even if it is so close to this sleeve. In DC or low frequency domain, this does not make any sense, but at resonant frequency it is very important. I did test with just 1/4 lambda piece of radiator and just sleeve - not as good as with added 1/4 lambda wire very close to this "inverted shield" part of the coax. Many receiver (even expensive ones) come with just radiating part and brass sleeve, without anythign attached. Or, even worst - it comes with just piece of random length coax and central wire of 1/4 lambda (such is FrSky receivers, cheaper versions). Someone asked my why with 60 mW transmitter he loses range aftrer 300 meters for ZMR250... and after convincing him ti make "proper" antennas, he never again lost range no matter what, even in dense forest.
There is a lot of good information that is hidden in books in the old countries. Many people just rely on everything that is placed on the internet. One must be prudent with the information on the internet, especially that which is placed in sites that are owned and controlled by companies that hold monopolies on audiences' attention.
do i spy a cb or ham boy here? i bet a swr meter for 5.8ghz is £££!
among a variety of cb antennas ive made, ive made a ground plane antenna like in this video for 446mhz and it works very well, made the main element and the radials slightly too long as you should in initilal building and got my swr down to 1.1 with careful trimming.
i dont know the range of it as its only been pushed to 10 miles so far but was crystal clear with no static what so ever using 5w at both ends and one end on a rubber duck! no signal meter as both of us were using a HT.
range is considerably further than 10 miles based on the quality when we tested it.
Very interesting :)
What kind of polarization is it?
For answering your question at the end, the video is not too long lol
I stopped using two separated batteries on my quads and i simply use LC Power Filter now for reducing the noise, i am pretty sure that will be for sure a pretty piece of cake for you to buid some lol
It is vertical polarization. I hate circular, had many problems with cloverleaf antennas, somewhat good experience with helical, but overall feeling is that - I just fall in love with vertical polarization. Horizontal has difficulties in the case that quadcopter turns 90 degrees, and second thing is that ground reflects slightly better horizontal polarization, which can make "multi-pathing" even worst (constructive or destructive interference). Yes, filter is okay, but if I need to use big capacitors and ferrite choke, then it gains weight. So instead, small battery for VTX and camera... I don't know. I will try it at some point. Thank you for reminder.
***** Yes you are right but honestly the weight compare to an extra LIPO is not the same, most of my LC Filters with big capacitor don't weight more than 14g so for me the choice was pretty clear at the end lol
Keep it up the great work and thanks for sharing your passion with us :)
Woah, 14 grams, uh... I think 180 mAh battery is about 5 grams. Only issue is with charging two batteries instead single, but that is sport too. :D
Very useful videos on antenna! Can you explain more why you don't like cicrular polarized video signal? Also, in the other video on the 2.4ghz antenna mod, I see you made a dipole antenna with balun. But on rcgroup, seems that people say they get best range with just the whip monopole with the balun. Very interested in hearing your comment on this.
I was about to make my own antenna's. I think I understand correctly that you achieved over a 1000 meters with jst 25mW vtx ? That is quite awsome. This antenna is even better ? I am really curius about the result. Very good video. Glad you made it ! Thanks!
Yes, but consider that at other end is 4 x patch antenna panel, directed antenna. With this combination (and yes, just 25 mW VTX), later got signal at 3 km, and at another not documented case 4.5 km. ua-cam.com/video/PlKE6jmA72k/v-deo.html
That is fantastic. I will surely make your antenna. Thank you for the measurements and your study and hard work! Best video since ages!
Thanks.
Thank you very much!
I made this antenna for my AIO FPV cam from Eachine QX90C, replaced original clover. With original clover range was around 40-50 meters (25mW) , with this antenna I flew more then 100 meters away and signal was good and image was OK.
Will make same for my Eachine TX03 AIO camera probably.
Just make sure that on both ends is vertical polarization of the antennas.
What kind of antenna you would advise to use on video receiver?
Also very curious about your Mobius FPV setup?
Is is OK in terms of latency?
Mobius is okay for slow flight as a camera for FPV. AOE is the name of the antenna, and I tested at 3 km: ua-cam.com/video/PlKE6jmA72k/v-deo.html
How do you know how long the lower, shielded cable has to be ?
Please take look at my web page, scroll little bit down, there is math: wildlab.org/index.php/2016/03/02/tutorial-how-to-increase-range-of-your-quadcopter/
Thanks for sharing this with us
You are welcome.
Hvala brate!
I like your Mobius fpv setup. I think I'm going to make one
Thanks. You will not regret - it is excellent stuff.
Hi, what is the name of that camera that you are using? Thank you!
Mobius action camera: www.banggood.com/Mobius-Full-HD-Sports-Camera-1080P-30FPS-720P-60FPS-For-Multirotor-p-90648.html?p=EH10221611330201505Q
And if you think about camera I am recording video, this is smartphone, Samsung Galaxy A5. Good camera, but has problem with auto focus. Audio is in most situations also good, but if it is set to something like auto-filter option, which do great job in filtering stray audio noises for phone puprose, the same filter make recording on camera less good option, since it constantly change some parameters.
Hey thank you very much for your kind answers! Have a good day!
You are welcome.
3dbi ... So around a Half DB real world gain figures compared to a dipole ( Dbd ) .
Dipole should be 3 DBi. This one is 0 DBd.
Very nice keep it up
Thanks.
Hi there, can u tell us what's the book name? thank you from Italy ;-)
This book I have is from Božo Metzger, "Radio priručnik za amatere i tehničare", published 1983 in Beograd. He translated and included many articles from ARRL Handbooks, maybe something still exist here: www.arrl.org/handbook
WOAH!!! I found whole book in PDF file: www.qsl.net/yu1bbv/ra_medija/ra_knjige/Radio_Prirucnik_Bozo_Metzger.pdf
Nice!! thank you!
Nice, its good but i don't know croatian... :-) check about this...
www.apparentlyapparel.com/uploads/5/3/5/6/5356442/_____practical_antenna_handbook_fourth_edition_carr.pdf
Has anyone tried to make a antenna like this with coaxial cable found in laptops,tablets and phones? I guess the cable found in laptops is better from a rigidity point of view. Anyway I would be grateful for some input.
Thanks in advance.
Very interesting awesome work thank you for watching it 👍✌ツ
Thank you too for nice comment.
Very useful. Thanks.
Thank you too for nice comment.
this, this, this... which is "it" !?