Maarten Baert's website

Game Maker / C++ projects

Home Model Creator ExtremePhysics Game Maker DLLs SimpleScreenRecorder Quadcopters   Recent comments Search

Recent comments

Showing last 30 comments, most recent first.


In Quadcopters / Pagoda antenna:

Maarten Baert

Administrator

Comment #1: Wed, 22 Mar 2017, 2:58 (GMT+1, DST)

Quote


Quote: Goose

Maarten,

Two questions as this is the first time I have toyed around with PCB antennas.

1. I am trying to have the PCB's done by a friend of mine here in the US and he is stating that the drill file is not included in the Gerber files. Do you know what he is talking about? If so how would I go about getting those from you? Email?

2. The FR4 needing to be 1mm is only the FR4 correct or is it the overall thickness including the Screenprint? I know the issues with dielectric speed, but you don't provide a total thickness of the board and screenprinting.

Thanks.

1. Tell him that the .txt file is the drill file. He probably wants to rename it to some other extension like ".drl". Sadly there's no universal standard for these extensions, some manufacters want ".txt.", others want ".drl" (short for Drill) and yet others want ".xln" (short for Excellon).

2. The 1.0 mm thickness is the base FR-4 material. But realistically it doesn't matter if it's off by a tiny amount, the properties of FR-4 tends to vary between manufacturers anyway. Solder mask is only ~20 µm so I just ignore it, it has no meaningful impact.

Last modified: Wed, 22 Mar 2017, 3:00 (GMT+1, DST)

In Quadcopters / Pagoda antenna:

Goose

Comment #2: Tue, 21 Mar 2017, 16:47 (GMT+1, DST)

Quote


Maarten,

Two questions as this is the first time I have toyed around with PCB antennas.

1. I am trying to have the PCB's done by a friend of mine here in the US and he is stating that the drill file is not included in the Gerber files. Do you know what he is talking about? If so how would I go about getting those from you? Email?

2. The FR4 needing to be 1mm is only the FR4 correct or is it the overall thickness including the Screenprint? I know the issues with dielectric speed, but you don't provide a total thickness of the board and screenprinting.

Thanks.

In SimpleScreenRecorder / Live streaming:

Maarten Baert

Administrator

Comment #3: Sun, 19 Mar 2017, 16:44 (GMT+1, DST)

Quote


Quote: Opssyq

HI Maarten,

Im using the SSR for the a week now and its working great with our WOWZA streaming server via RTMP stream. however when i enable the RTMP authentication on WOWZA i couldn't manage to push the stream from SSR, i cant find a way yet on how/what will be right RTMP parameters that should includes the username and password.

Do you have any advise?

Thank you.

SSR relies on the RTMP support in FFmpeg. If FFmpeg doesn't support the authentication system you want to use, then there's not much I can do. I have no plans to add native RTMP support to SSR for now considering how much work this will be.

In Quadcopters / Antennas:

Maarten Baert

Administrator

Comment #4: Sun, 19 Mar 2017, 16:43 (GMT+1, DST)

Quote


Quote: Kenadias

Hey Maarten thanks for your awsome work on the pagoda antenna.
I was wondering if there are any patch antennas that will work with the pagoda for diversity recievers.

Any decent circularly polarized patch will work with the Pagoda. I actually have a new patch design coming out in 1-2 months probably, but if you don't want to wait that long, take a look at the patches from SpiroNet or MenaceRC. Or use a helical antenna, those are fine too.

In ExtremePhysics / Reference:

Maarten Baert

Administrator

Comment #5: Sun, 19 Mar 2017, 16:28 (GMT+1, DST)

Quote


Quote: Lukayson

Hello, Is there a way to detect if body is sliding on another? I want for example metal part making sparks when sliding on concrete. Thank you

Read this article. Combine this with ep_body_get_xvel_local_point and ep_body_get_yvel_local_point to detect whether the bodies are sliding. Example:

var s, c, b, object;
for(s = ep_body_first_shape(global.world, body); s!=0; s = ep_shape_next(global.world, body, s)) {
    for(c = ep_shape_get_first_contact(global.world, body, s); c!=0; c = ep_shape_get_next_contact(global.world, body, s, c)) {
        b = ep_contact_get_body1(global.world, c);
        if b=body {
            b = ep_contact_get_body2(global.world, c);
        }
        object = ep_body_get_user_var(global.world, b, 0);
        if object.object_index=obj_block {
            // this instance is touching a block
            
            b1 = ep_contact_get_body1(global.world, c);
            gx1 = ep_contact_get_point1_x(global.world, c);
            gy1 = ep_contact_get_point1_y(global.world, c);
            lx1 = ep_body_coord_world_to_local_x(global.world, b1, gx1, gy1);
            ly1 = ep_body_coord_world_to_local_y(global.world, b1, gx1, gy1);
            vx1 = ep_body_get_xvel_local_point(world_id, b1, lx1, ly1);
            vy1 = ep_body_get_yvel_local_point(world_id, b1, lx1, ly1);
            
            b2 = ep_contact_get_body2(global.world, c);
            gx2 = ep_contact_get_point2_x(global.world, c);
            gy2 = ep_contact_get_point2_y(global.world, c);
            lx2 = ep_body_coord_world_to_local_x(global.world, b2, gx2, gy2);
            ly2 = ep_body_coord_world_to_local_y(global.world, b2, gx2, gy2);
            vx2 = ep_body_get_xvel_local_point(world_id, b2, lx2, ly2);
            vy2 = ep_body_get_yvel_local_point(world_id, b2, lx2, ly2);
            
            nx = ep_contact_get_normal_x(global.world, c);
            ny = ep_contact_get_normal_y(global.world, c);
            vel = abs(nx * (vy1 - vy2) - ny * (vx1 - vx2));
            if(vel > 0.1) {
                // generate sparks here
            }
            
        }
    }
}

Not tested.

Last modified: Sun, 19 Mar 2017, 16:38 (GMT+1, DST)

In Quadcopters / Pagoda antenna:

Maarten Baert

Administrator

Comment #6: Sun, 19 Mar 2017, 16:22 (GMT+1, DST)

Quote


Quote: Gadgetfpv

Now my PCB supplier is asking whether the PCB is Single or Double Sided? Would you be kind enough to let me know...

Double sided, otherwise you will miss some pads on the bottom side and you won't get through-hole metallization.

Quote: Tok

Are there any plans for a 1280Mhz version of the pagoda ?

No, it would be too big to be practical.

Quote: Matan

I built the antennas, and I'm having some performance problems.
I' using the same cable and connector you give links to, made the PCB's at elecrow, and assembles using your jig and following your video.

I think it's because of a minor mistake on the gap between the PCBs, they are about 0.1-0.2mm closer then what you specified.
Could that be the reason? if not, what else?

I intend to design a new jig that will make the assembly more convenient, as well as more accurate. (and will that will be 3d printed and not laser cut, which is where my inaccuracy come from)

So, do you think its possible to cut a notch in the two big PCBs so they will be at a fixed position in the jig? (instead of the silkscreen lines, cut three tiny notches on the outer part of the PCB and have a dimple in the jig that will sit in the notch so they will be at fixed position to one another)

Will it have an impact on the performance?
If it's OK, how can I alter the design? with what program?

If you place the notches far enough away from the copper elements, it should be fine. You can change the PCBs by modifying the Python scripts that I use to generate them. They are included in the design files.

Quote: Ivan

Thanks for your antenna design Maarten.
I tryd to isolate traceroute the antenna after exporting the gerbers to have it isolated traced for my cnc.
Unfortunately i must have done it badly, i am sure the measure is off after i tryd to export them.
My SWR is way too high and only its about 1:3 at the highest frequency to get best SWR... lol
Allmost sure the arms are too short after converting.
Is it possible to have some dxf files so i can try it again? Converting gerbers to anything usable is failing here.
Got my hands on a few FR4 pcb 1mm now so i dont have to thinning the 1.6mm pcb.
Hope you can help me out.
Thanks in advance.

ps. got 2 pagoda antennas in meantime to play with from Menace. SWR seems better without the protection cover.
Tested some Depron foam between the 2 top plates has giving me a good result, hardly affect the SWR

DXF files are now included in the design files. Getting DXF files from Gerbers is really annoying, I generated them from SVGs instead.

Quote: Willem

Hi Maarten, where can I buy these antenna kit(s) in Belgium please?
Best regards.

I'm not aware of any sellers in Belgium specifically, but I'm pretty sure that you can get the international sellers to ship it to Belgium.

Quote: Rotordog

I was wonder what makes the difference in a RHCP and LHCP with the Pagoda? Are the templates in the disc simply going in the opposite direction to change the polarization> Like a cloverleaf.

I also thought I understood from previous post that in fact the cable length creates no no issues so long as the disc do not contact anything potentially conductive.

Thanks!

Yes, the LHCP and RHCP version are just mirror images of each other. Just mirror the two top PCBs and you will get the opposite polarization.

Quote: Rotordog

One last question. Would it cause any issue with performance if you dipped the PCB antenna disc and at least part of the coax in a protective liquid vinyl?

Yes, unless it's an extremely thin layer (less than 0.1 mm). You can probably get much better results with Styrofoam, which doesn't affect the performance significantly.

Quote: Efeksk

Hello maarten
My name is Halim KARAPINAR
I have been manufacturing antennas for FPV systems for about 3 years. I am very successful in this regard in Turkey. And I produced the antennas you designed for the first time in Turkey. I produced 45 pairs of antennas for the 1st race of the Turkish Dron Competition League which will take place in Istanbul city on March 19, 2017 and delivered it to the competitors. These antennas are excellent.

I need help on a topic.
I want to make changes to the prints on the PCB antennas.
For that you can tell me the raw files of the antennas and what program I can open. I use DipTrace. But if I have to open it with a different program, I can also download that program.

I also want to make a small donation for you.
Thank you very much for sharing your help and design.
The producer of SkyRod Antennas is Halim KARAPINAR.

The Gerber files are generated by Python scripts which are also included in the design files. I did not use traditional PCB software to design these PCBs.

In Game Maker DLLs / Buffers:

Jmscreator

Comment #7: Sun, 19 Mar 2017, 5:41 (GMT+1, DST)

Quote


Quote: Maarten Baert
Quote: Jmscreator

When reading from a buffer, if you read more than what is in the buffer, zero is returned(this isn't the issue I'm referring to). Now I do my best to write clean code, and I make it nearly impossible for this to happen, but with sockets, and data that can sometimes glitch once in a great while, there is still the possibility for a buffer read to read outside of the buffer size.

As far as I can tell there is no bug here, you just misunderstand how buffers work. If your buffer has one byte remaining, and you try to read a type that is two bytes large, nothing is read, the error flag is set, and the function just returns a default value (0). The position does not change. So no matter how many times you call buffer_read_uint16, you will never read that last byte.

What you should do instead is call buffer_get_error after reading a message to verify that nothing went wrong. Situations like this will set the error flag, and it won't be cleared until you call buffer_clear_error or buffer_clear.

Also, as long as the error flag is set, all read functions will return zero (or empty strings in some cases).

Thank you for informing me about this! I just saw this reply today.

In Quadcopters / Pagoda antenna:

Efeksk

Comment #8: Mon, 13 Mar 2017, 14:34 (GMT+1, DST)

Quote


Hello maarten
My name is Halim KARAPINAR
I have been manufacturing antennas for FPV systems for about 3 years. I am very successful in this regard in Turkey. And I produced the antennas you designed for the first time in Turkey. I produced 45 pairs of antennas for the 1st race of the Turkish Dron Competition League which will take place in Istanbul city on March 19, 2017 and delivered it to the competitors. These antennas are excellent.

I need help on a topic.
I want to make changes to the prints on the PCB antennas.
For that you can tell me the raw files of the antennas and what program I can open. I use DipTrace. But if I have to open it with a different program, I can also download that program.

I also want to make a small donation for you.
Thank you very much for sharing your help and design.
The producer of SkyRod Antennas is Halim KARAPINAR.

[img]http://i.hizliresim.com/ZZ7WYo.jpg[/img]
[img]http://i.hizliresim.com/9Q2Rgo.jpg[/img]
[img]http://i.hizliresim.com/JanXqW.jpg[/img]
[img]http://i.hizliresim.com/nRLkR5.jpg[/img]
[img]http://i.hizliresim.com/M0LX0k.jpg[/img]

In Quadcopters / Pagoda antenna:

Rotordog

Comment #9: Sun, 12 Mar 2017, 21:54 (GMT+1, DST)

Quote


One last question. Would it cause any issue with performance if you dipped the PCB antenna disc and at least part of the coax in a protective liquid vinyl?

In Quadcopters / Pagoda antenna:

Rotordog

Comment #10: Sun, 12 Mar 2017, 21:23 (GMT+1, DST)

Quote


I was wonder what makes the difference in a RHCP and LHCP with the Pagoda? Are the templates in the disc simply going in the opposite direction to change the polarization> Like a cloverleaf.

I also thought I understood from previous post that in fact the cable length creates no no issues so long as the disc do not contact anything potentially conductive.

Thanks!

In ExtremePhysics / Reference:

Lukayson

Comment #11: Tue, 7 Mar 2017, 14:57 (GMT+1, DST)

Quote


Hello, Is there a way to detect if body is sliding on another? I want for example metal part making sparks when sliding on concrete. Thank you

In Quadcopters / Antennas:

Kenadias

Comment #12: Sun, 5 Mar 2017, 0:55 (GMT+1, DST)

Quote


Hey Maarten thanks for your awsome work on the pagoda antenna.
I was wondering if there are any patch antennas that will work with the pagoda for diversity recievers.

In Quadcopters / Pagoda antenna:

Willem

Comment #13: Wed, 1 Mar 2017, 15:47 (GMT+1, DST)

Quote


Hi Maarten, where can I buy these antenna kit(s) in Belgium please?
Best regards.
w.

In Quadcopters / Pagoda antenna:

Ivan

Comment #14: Sun, 26 Feb 2017, 15:10 (GMT+1, DST)

Quote


Thanks for your antenna design Maarten.
I tryd to isolate traceroute the antenna after exporting the gerbers to have it isolated traced for my cnc.
Unfortunately i must have done it badly, i am sure the measure is off after i tryd to export them.
My SWR is way too high and only its about 1:3 at the highest frequency to get best SWR... lol
Allmost sure the arms are too short after converting.
Is it possible to have some dxf files so i can try it again? Converting gerbers to anything usable is failing here.
Got my hands on a few FR4 pcb 1mm now so i dont have to thinning the 1.6mm pcb.
Hope you can help me out.
Thanks in advance.

ps. got 2 pagoda antennas in meantime to play with from Menace. SWR seems better without the protection cover.
Tested some Depron foam between the 2 top plates has giving me a good result, hardly affect the SWR

Last modified: Sun, 26 Feb 2017, 19:17 (GMT+1, DST)

In Quadcopters / Pagoda antenna:

Matan

Comment #15: Fri, 24 Feb 2017, 10:35 (GMT+1, DST)

Quote


Hi.
I built the antennas, and I'm having some performance problems.
I' using the same cable and connector you give links to, made the PCB's at elecrow, and assembles using your jig and following your video.

I think it's because of a minor mistake on the gap between the PCBs, they are about 0.1-0.2mm closer then what you specified.
Could that be the reason? if not, what else?

I intend to design a new jig that will make the assembly more convenient, as well as more accurate. (and will that will be 3d printed and not laser cut, which is where my inaccuracy come from)

So, do you think its possible to cut a notch in the two big PCBs so they will be at a fixed position in the jig? (instead of the silkscreen lines, cut three tiny notches on the outer part of the PCB and have a dimple in the jig that will sit in the notch so they will be at fixed position to one another)

Will it have an impact on the performance?
If it's OK, how can I alter the design? with what program?

Thanks,
Matan.

In Quadcopters / Pagoda antenna:

Tok

Comment #16: Thu, 23 Feb 2017, 20:46 (GMT+1, DST)

Quote


Hi Marteen

Are there any plans for a 1280Mhz version of the pagoda ?

Br
Thor Magne
Norway

In Quadcopters / Pagoda antenna:

Willem

Comment #17: Thu, 23 Feb 2017, 14:52 (GMT+1, DST)

Quote


Dag Maarten, waar kan ik de kits voor deze antennes kopen in België aub?
Mvg.

In SimpleScreenRecorder / Live streaming:

Opssyq

Comment #18: Wed, 22 Feb 2017, 10:37 (GMT+1, DST)

Quote


HI Maarten,

Im using the SSR for the a week now and its working great with our WOWZA streaming server via RTMP stream. however when i enable the RTMP authentication on WOWZA i couldn't manage to push the stream from SSR, i cant find a way yet on how/what will be right RTMP parameters that should includes the username and password.

Do you have any advise?

Thank you.

In Quadcopters / Pagoda antenna:

Gadgetfpv

Comment #19: Tue, 21 Feb 2017, 10:31 (GMT+1, DST)

Quote


Dear Maarten,

Thank you so much for responding to my last post...

Now my PCB supplier is asking whether the PCB is Single or Double Sided? Would you be kind enough to let me know...

Last modified: Tue, 21 Feb 2017, 10:42 (GMT+1, DST)

In Quadcopters / Pagoda antenna:

Maarten Baert

Administrator

Comment #20: Tue, 21 Feb 2017, 1:40 (GMT+1, DST)

Quote


Quote: Peter62233460

Hi Marteen! Thanks for designing this awesome antenna.

I would like to build the antenna and I was wondering whether I could use other coaxes instead of the RG402 you recommend. I bought some RG316 cables years ago and I am wondering whether this would be okay to use. As for the construction jig, I can modify the design to accept the narrower cable and laser cut it.

Thanks,

Peter.

The design is made for RG402 and won't perform properly with cables that have a different diameter. It requires re-optimization of the design. I don't have time to do that now though. Also, RG316 is likely too flexible for this antenna.

Quote: Pauloxzr

Hello Maarten Baert! Greetings from Brazil! My name is Paul! First of all I want to congratulate you for your brilliant work! I've always wanted to make my own antennas and with your project I see that I have the opportunity to make my first antenna correctly and accurately. I have spent a lot of money buying antennas that are not efficient and resistant, and I found in your project what I need. In the city and country where I live I do not have many resources, like a company that makes PCBs. I have only people who have machines that do the cutting and drawing of PCBs, but these machines only receive source files made in pcad, orcad, proteus, eagle. Is there any way to convert Gerber files to be interpreted on these machines and programs? I am very interested in your project! I do not want to make antennas for resale or make money, I just want it for personal use in my racing drone. I have an intermediate experience in electronics, and I can build the antennas precisely as described in the videos I saw on your site. The only detail is that I do not have the machine to cut the PCBs. Thank you very much for what you can do for me. Thank you very much.

I sent you DXF files by email, try to use those. Gerber files are still the recommended format though, it's the industry standard for PCB design. I've never heard of any manufacturer that can't accept Gerber files.

Quote: Gadgetfpv

Hi..

Thank you for sharing this design... can't wait to try... one quick question... the smaller disc in the assembly has copper in it, correct...

Sorry if this a simple question, quite new to all of this PCB design stuff...

Gadget

Yes, the bottom side of the small disk is almost entirely covered with copper.

Quote: Luno

Hi!

I've got a Beerotor Honeydrop antenna which is using your Pagoda design. The cable shielding is missing between the top and the middle PCBs. I wonder if this antenna performs bad because of that.

http://forum.rcdesign.ru/attachment.php?attachmentid=1298680&d=1487348602

I have seem many people complain about build quality issues with that antenna. Problems with the SMA connector, bad PCB alignment, cases that fall apart, bad soldering and so on. I don't recommend it.

Quote: Nhillerby

Hello Maarten, could this sma cord included in the pagoda 2 kit be cut down to a shorter length? It's a bit lengthy for fpv. Thank you for your genious invention.

You can shorten it, but this will bring the antenna closer to the quadcopter frame which will result in a larger 'dead zone' where the frame is blocking the signal. Just be aware of that.

In Quadcopters / Pagoda antenna:

Nhillerby

Comment #21: Mon, 20 Feb 2017, 2:23 (GMT+1, DST)

Quote


Hello Maarten, could this sma cord included in the pagoda 2 kit be cut down to a shorter length? It's a bit lengthy for fpv. Thank you for your genious invention.

In Quadcopters / Pagoda antenna:

Luno

Comment #22: Fri, 17 Feb 2017, 22:19 (GMT+1, DST)

Quote


Hi!

I've got a Beerotor Honeydrop antenna which is using your Pagoda design. The cable shielding is missing between the top and the middle PCBs. I wonder if this antenna performs bad because of that.

http://forum.rcdesign.ru/attachment.php?attachmentid=1298680&d=1487348602

In Quadcopters / Pagoda antenna:

Gadgetfpv

Comment #23: Fri, 17 Feb 2017, 16:04 (GMT+1, DST)

Quote


Hi..

Thank you for sharing this design... can't wait to try... one quick question... the smaller disc in the assembly has copper in it, correct...

Sorry if this a simple question, quite new to all of this PCB design stuff...

Gadget

In Quadcopters / Pagoda antenna:

Pauloxzr

Comment #24: Thu, 16 Feb 2017, 7:08 (GMT+1, DST)

Quote


Hello Maarten Baert! Greetings from Brazil! My name is Paul! First of all I want to congratulate you for your brilliant work! I've always wanted to make my own antennas and with your project I see that I have the opportunity to make my first antenna correctly and accurately. I have spent a lot of money buying antennas that are not efficient and resistant, and I found in your project what I need. In the city and country where I live I do not have many resources, like a company that makes PCBs. I have only people who have machines that do the cutting and drawing of PCBs, but these machines only receive source files made in pcad, orcad, proteus, eagle. Is there any way to convert Gerber files to be interpreted on these machines and programs? I am very interested in your project! I do not want to make antennas for resale or make money, I just want it for personal use in my racing drone. I have an intermediate experience in electronics, and I can build the antennas precisely as described in the videos I saw on your site. The only detail is that I do not have the machine to cut the PCBs. Thank you very much for what you can do for me. Thank you very much.

In Quadcopters / Pagoda antenna:

Peter62233460

Comment #25: Sun, 5 Feb 2017, 20:47 (GMT+1, DST)

Quote


Hi Marteen! Thanks for designing this awesome antenna.

I would like to build the antenna and I was wondering whether I could use other coaxes instead of the RG402 you recommend. I bought some RG316 cables years ago and I am wondering whether this would be okay to use. As for the construction jig, I can modify the design to accept the narrower cable and laser cut it.

Thanks,

Peter.

In Quadcopters / Pagoda antenna:

Maarten Baert

Administrator

Comment #26: Sat, 4 Feb 2017, 21:22 (GMT+1, DST)

Quote


Quote: Serop72

Hello!in figure assembly distance between the layers of 3.65mm and 10.45mm
in the assembly jig 3.85mm and 10.65mm (I measure up to the laser cutting file)

It is right?

Thank you for your work! very interesting design, I'm going to do the antenna

The correct numbers are 3.65mm and 10.45mm. The laser cutting drawing was adjusted to compensate for the line width of the laser, which is roughly 0.2mm (at least for the model that I'm using). If the slots are too narrow, you can easily widen them with some fine sandpaper or a small file. If they are too wide, they don't hold the PCB in place very well which is annoying. They also widen automatically as you use them because the jig wears out over time.

Quote: Stinkyjohn

Hi to all,
thanks Maarten for design. Made 18 antennas for my and my friends.
One of them has spectrum analyser at lab, so we checked them. They has good vswr - 1.23 to 1.35
But to bet true they are very very sensitive to assembly process.
Dimension tolerances should be very tight and even after that resonation point can flow about +-150Mhz (few of them was away at 180Mhz).
I've designed to that new assembly jig with 4 support points of pcb's. Cut it on CNC and it's from G10 and has very tight fit.
I'm not talking that design is bad, but you should know how tight tolerances are for 5.8Ghz. We done many cloverleafs to our racing drones (don't know why, but they don't have long live :) ) so I know how at 5.8Ghz precise you should be when making antennas for 5.8Ghz to archive good repeatability (within 100Mhz), and even after that some of antennas are off 300Mhz ;)

This is strange, I can get much better repeatability myself and I'm also using manual assembly. The 'VNA measurement' graph above shows three units which I assembled manually, I was seeing only about 50 MHz variation.

I have found that the solder joints matter a lot. Make sure that you are using the right amount of solder and heating the joints long enough to ensure they reflow properly (like I do in my assembly video).

Quote: Stinkyjohn

I've also noted that connector type and manufacture of cable will also have impact on antenna.
After my findings i've found discussion on RCG about differences in Chinese SMA and RP-SMA connectors and cables. As I remember Martin7182 or markus123456 confirmed that theory. Alex also often talks about quality of cables.

Yes, I have noticed that too. The length of the cable also has some impact because it affects the phase shift between the SMA connector and the antenna. If the connector was perfect, this would not matter, but the fact that I can measure a difference indicates that the SMA connector I'm using isn't perfect.

Quote: Stinkyjohn

And one more thing, beware printed cases for Pagodas. I've printed them from PLA, PLA+, TPU, ABS, PETG and TITANX.
They all shifts antenna and a lot. Shift strictly depends on filament, how many (how thick) you use. I've tried ready designs and my own - with minimal amount of filament - all off them shifts antenna. So we will use Pagodas without cases.

I know - if you want a case, you should consider scaling the antenna down to compensate for the frequency shift. But if the case is thin enough, the shift is quite small, so the antenna will still work quite well. I have done measurements of the MenaceRC model with case, and it was only shifted down by about 100 MHz.

In SimpleScreenRecorder / Recording for YouTube:

Maarten Baert

Administrator

Comment #27: Sat, 4 Feb 2017, 20:53 (GMT+1, DST)

Quote


Quote: Harishpathangay

hi,
how to make sure that i am recording from external mic and not internal mic?

thanks,
harish pathangay

That depends completely on your hardware. Try running 'alsamixer' in a terminal, there is probably a switch you can toggle.

In Quadcopters / Pagoda antenna:

Stinkyjohn

Comment #28: Fri, 3 Feb 2017, 10:03 (GMT+1, DST)

Quote


Hi to all,
thanks Maarten for design. Made 18 antennas for my and my friends.
One of them has spectrum analyser at lab, so we checked them. They has good vswr - 1.23 to 1.35
But to bet true they are very very sensitive to assembly process.
Dimension tolerances should be very tight and even after that resonation point can flow about +-150Mhz (few of them was away at 180Mhz).
I've designed to that new assembly jig with 4 support points of pcb's. Cut it on CNC and it's from G10 and has very tight fit.
I'm not talking that design is bad, but you should know how tight tolerances are for 5.8Ghz. We done many cloverleafs to our racing drones (don't know why, but they don't have long live :) ) so I know how at 5.8Ghz precise you should be when making antennas for 5.8Ghz to archive good repeatability (within 100Mhz), and even after that some of antennas are off 300Mhz ;)
I've also noted that connector type and manufacture of cable will also have impact on antenna.
After my findings i've found discussion on RCG about differences in Chinese SMA and RP-SMA connectors and cables. As I remember Martin7182 or markus123456 confirmed that theory. Alex also often talks about quality of cables.

And one more thing, beware printed cases for Pagodas. I've printed them from PLA, PLA+, TPU, ABS, PETG and TITANX.
They all shifts antenna and a lot. Shift strictly depends on filament, how many (how thick) you use. I've tried ready designs and my own - with minimal amount of filament - all off them shifts antenna. So we will use Pagodas without cases.

Anyway, great design. When weather will allow, we will test them on our racing field.

In Quadcopters / Pagoda antenna:

Serop72

Comment #29: Sun, 29 Jan 2017, 21:08 (GMT+1, DST)

Quote


Hello!in figure assembly distance between the layers of 3.65mm and 10.45mm
in the assembly jig 3.85mm and 10.65mm (I measure up to the laser cutting file)

It is right?

Thank you for your work! very interesting design, I'm going to do the antenna

In SimpleScreenRecorder / Recording for YouTube:

Harishpathangay

Comment #30: Fri, 27 Jan 2017, 18:00 (GMT+1, DST)

Quote


hi,
how to make sure that i am recording from external mic and not internal mic?

thanks,
harish pathangay