Maarten Baert's website

Game Maker / C++ projects

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

Recent comments

Showing last 30 comments, most recent first.


In Quadcopters / Pagoda antenna:

Maarten Baert

Administrator

Comment #1: Sat, 16 Jun 2018, 16:58 (GMT+1, DST)

Quote


Quote: Hotmultimedia

Was the antenna designed with that 3D printed plastic cover? How does it affect it's operation?

I don't have anechoic chamber measurements of the antenna with cover, but you can see some VNA measurements here.

In Quadcopters / Antennas:

Maarten Baert

Administrator

Comment #2: Sat, 16 Jun 2018, 16:56 (GMT+1, DST)

Quote


Quote: Hotmultimedia

Hi. Can you recommend an antenna simulation software?

I'm wondering if it would be possible to design an atleast somewhat operating 5.8GHz antenna that would be embedded within a wooden block.

I use HFSS. CST is also good. Both are too expensive for hobbyists though, I can use it through my university.

You can't really embed a 5.8GHz antenna in a wooden block, the absorption of the wood is way too high.

In Quadcopters / Pagoda antenna:

Hotmultimedia

Comment #3: Fri, 15 Jun 2018, 9:26 (GMT+1, DST)

Quote


Was the antenna designed with that 3D printed plastic cover? How does it affect it's operation?

In Quadcopters / Antennas:

Hotmultimedia

Comment #4: Wed, 13 Jun 2018, 22:29 (GMT+1, DST)

Quote


Hi. Can you recommend an antenna simulation software?

I'm wondering if it would be possible to design an atleast somewhat operating 5.8GHz antenna that would be embedded within a wooden block.

In Quadcopters / Triple Feed Patch antenna:

Maarten Baert

Administrator

Comment #5: Fri, 1 Jun 2018, 1:43 (GMT+1, DST)

Quote


Quote: Prouser27

Hello Maarten!

On the vertical cross-section image it looks like as the LHCP is more "stronger" as the RHCP polarization? The LHCP polarization looks like an big signal bubble in on direction and the RHCP much smaller.

Or are the two polarizations equally strong?

The images show the radiation pattern when a signal is applied to the LHCP port and the RHCP port has only a 50 ohm terminator connected to it. It's not supposed to transmit any RHCP radiation. If you swap the signal to the other port, LHCP and RHCP will be swapped as well. So LHCP and RHCP are equally strong, at least when using the right port.

In ExtremePhysics / Collision filtering:

Maarten Baert

Administrator

Comment #6: Fri, 1 Jun 2018, 1:41 (GMT+1, DST)

Quote


Quote: 7upnamk

Hi maarten. I never work with bitwise operation before so that i've been confused so much with your destructible terrain example. In the terrainblock_init script, i cant understand this:

mask = (1<<(size+1))|1;

why do you add

|1

into this? I've tried to comment like this

mask = (1<<(size+1))//|1;

and it still worked.
Sorry about my bad english
Thanks so much for your effecient extension!

If I recall correctly I did that because I use the least significant bit for collisions with regular objects. However ExtremePhysics is set up in such a way that if at least one of the two objects has a collision mask bit in common with the other, a collision will happen, so removing that bit does nothing in this case. However if you removed it as well for the regular objects, they would no longer collide with the terrain.

The (1<<(size+1)) part is used to quickly find all terrain boxes of a certain size.

In Quadcopters / Triple Feed Patch antenna:

Prouser27

Comment #7: Wed, 30 May 2018, 14:48 (GMT+1, DST)

Quote


Hello Maarten!

On the vertical cross-section image it looks like as the LHCP is more "stronger" as the RHCP polarization? The LHCP polarization looks like an big signal bubble in on direction and the RHCP much smaller.

Or are the two polarizations equally strong?

Last modified: Wed, 30 May 2018, 14:50 (GMT+1, DST)

In ExtremePhysics / Collision filtering:

7upnamk

Comment #8: Wed, 30 May 2018, 6:09 (GMT+1, DST)

Quote


Hi maarten. I never work with bitwise operation before so that i've been confused so much with your destructible terrain example. In the terrainblock_init script, i cant understand this:

mask = (1<<(size+1))|1;

why do you add

|1

into this? I've tried to comment like this

mask = (1<<(size+1))//|1;

and it still worked.
Sorry about my bad english
Thanks so much for your effecient extension!

In SimpleScreenRecorder / Troubleshooting:

Krish

Comment #9: Mon, 28 May 2018, 18:11 (GMT+1, DST)

Quote


Quote: Maarten Baert
Quote: Krish

Thank you for this very useful program.

I am trying to record some videos for uploading to Vimeo. I am using a screen capture area of 854 x 480. Whether I use the H264 codec and a CRF of 16 or 18 and the ultrafast preset or the libx264 codec with a 5000 kbit/s bit rate my final video does not have a video bit rate of more than 70 or 80 kbit/s. Vimeo complains that my video is of low quality.

What is it that I am doing wrong?

Thanks.

If the video looks good to you, then ignore the warnings. Some types of video don't need a high bit rate (e.g. mostly static images, like many video tutorials). If you think it looks bad, please send me the video file so I can take a look.

The videos do not look bad. These are videos of math and physics problem solving as in Khan academy. I think I shall take your advice. Thanks.

In Quadcopters / Pagoda antenna:

Hugo

Comment #10: Sun, 27 May 2018, 22:21 (GMT+1, DST)

Quote


Quote: Maarten Baert
Quote: Unknown

Hi,

Any news about 2.4Ghz design?

I haven't had time for it yet. It's not a high priority for me because I suspect that very few people will use it.

For 2.4 check:

https://www.truerc.ca/shop/antennas/2-4ghz/singularity-24

Not same design, smaller but norrower bandwidth, not that you need more than what’s legal anyway.

In SimpleScreenRecorder / Troubleshooting:

Maarten Baert

Administrator

Comment #11: Sun, 27 May 2018, 19:38 (GMT+1, DST)

Quote


Quote: Krish

Thank you for this very useful program.

I am trying to record some videos for uploading to Vimeo. I am using a screen capture area of 854 x 480. Whether I use the H264 codec and a CRF of 16 or 18 and the ultrafast preset or the libx264 codec with a 5000 kbit/s bit rate my final video does not have a video bit rate of more than 70 or 80 kbit/s. Vimeo complains that my video is of low quality.

What is it that I am doing wrong?

Thanks.

If the video looks good to you, then ignore the warnings. Some types of video don't need a high bit rate (e.g. mostly static images, like many video tutorials). If you think it looks bad, please send me the video file so I can take a look.

In Quadcopters / Antennas:

Maarten Baert

Administrator

Comment #12: Sun, 27 May 2018, 19:35 (GMT+1, DST)

Quote


Quote: W2hro

Have you designed an RHCP / LHCP antenna for L-Band frequency?

This patch antenna design would be useful as a feed for L-band satellite dishes.

Contact info - w2hro.fn20@gmail.com

Quote: Efeksk

Hi maarten.
I congratulate you on your work.
You're doing a pretty good job.
Acama Do you have an antenna development plan for 1.2 GHz and 2.4 GHz frequencies?

I'm not currently working on antennas for lower frequencies due to time limitations, but I may do so in the future.

In SimpleScreenRecorder / Troubleshooting:

Krish

Comment #13: Sat, 26 May 2018, 19:24 (GMT+1, DST)

Quote


Thank you for this very useful program.

I am trying to record some videos for uploading to Vimeo. I am using a screen capture area of 854 x 480. Whether I use the H264 codec and a CRF of 16 or 18 and the ultrafast preset or the libx264 codec with a 5000 kbit/s bit rate my final video does not have a video bit rate of more than 70 or 80 kbit/s. Vimeo complains that my video is of low quality.

What is it that I am doing wrong?

Thanks.

In Quadcopters / Antennas:

Efeksk

Comment #14: Wed, 23 May 2018, 9:31 (GMT+1, DST)

Quote


Hi maarten.
I congratulate you on your work.
You're doing a pretty good job.
Acama Do you have an antenna development plan for 1.2 GHz and 2.4 GHz frequencies?

In Quadcopters / Pagoda antenna:

Maarten Baert

Administrator

Comment #15: Mon, 21 May 2018, 15:22 (GMT+1, DST)

Quote


Quote: Unknown

Hi,

Any news about 2.4Ghz design?

I haven't had time for it yet. It's not a high priority for me because I suspect that very few people will use it.

In Quadcopters / Pagoda antenna:

Unknown

Comment #16: Sat, 19 May 2018, 19:50 (GMT+1, DST)

Quote


Hi,

Any news about 2.4Ghz design?

In SimpleScreenRecorder / Troubleshooting:

Maarten Baert

Administrator

Comment #17: Thu, 17 May 2018, 21:56 (GMT+1, DST)

Quote


Quote: Steveebey73701

Running F28 Fedora Linux 64Bit. Installed distro copy of SSR, if I select AAC as audio codec for mp4 I can not record, and the system reports no audo codec. MP3 records audio just fine. uninstalled distro version, downloaded git version, made sure aac libs existed and all other dependencies, compiled with your simple build script, ran from gui, aac still fails, ran from command line aac fails, mp3 audio works.

If you run ffmpeg from the command line, are you able to generate AAC files?

In Quadcopters / Pagoda antenna:

Maarten Baert

Administrator

Comment #18: Thu, 17 May 2018, 21:54 (GMT+1, DST)

Quote


Quote: Illia

Hi, Maarten!
I want to make a "stubby"-like pagoda, and I wonder - will it perform worse if I remove lower small disc and solder the connector right under mid disc of the antenna?

Yes. This has been asked many times :).

In Quadcopters / Triple Feed Patch Array antenna:

Maarten Baert

Administrator

Comment #19: Thu, 17 May 2018, 21:13 (GMT+1, DST)

Quote


Quote: Tagada73

Hi Mr Baert what diameter of your new feed patches? Thanks in advance

The diameter is 15 cm.

Quote: Blackbox

Hi, thanks for the numerous designs you keep publishing. They really bring the cost of directional antennas down for hobbyists. I have a few questions though.
Will the antenna perform significantly worse if the through holes are plated ? I forgot to mention it when I ordered pcbs for the previous triple feed patch design.
Also, does the copper wire diameter really matters if you still manage to have the right distance between the 2 antenna parts ?
TIP for hobbyist : Use JLCPCB for your first order, it's the cheaper.

The holes have no significant impact on the performance, you can change them or even remove them entirely. If you don't mention that they are unplated, two things can happen: either the manufacturer tries to plate them anyway (very unlikely because there is no copper on the top or bottom), or the manufacturer ignores the file with unplated holes (so there will be no mounting holes).

The copper wire diameter is important, you should buy 1mm wire or something very close to it if you don't have it already. Don't try it with e.g. 0.5mm, this will most likely create a significant shift in center frequency and affect the matching between the feed network and the antenna (which can affect the axial ratio).

In SimpleScreenRecorder / Troubleshooting:

Steveebey73701

Comment #20: Thu, 17 May 2018, 19:06 (GMT+1, DST)

Quote


Running F28 Fedora Linux 64Bit. Installed distro copy of SSR, if I select AAC as audio codec for mp4 I can not record, and the system reports no audo codec. MP3 records audio just fine. uninstalled distro version, downloaded git version, made sure aac libs existed and all other dependencies, compiled with your simple build script, ran from gui, aac still fails, ran from command line aac fails, mp3 audio works.

In Quadcopters / Triple Feed Patch Array antenna:

Blackbox

Comment #21: Thu, 17 May 2018, 18:01 (GMT+1, DST)

Quote


Hi, thanks for the numerous designs you keep publishing. They really bring the cost of directional antennas down for hobbyists. I have a few questions though.
Will the antenna perform significantly worse if the through holes are plated ? I forgot to mention it when I ordered pcbs for the previous triple feed patch design.
Also, does the copper wire diameter really matters if you still manage to have the right distance between the 2 antenna parts ?
TIP for hobbyist : Use JLCPCB for your first order, it's the cheaper.

In Quadcopters / Pagoda antenna:

Illia

Comment #22: Wed, 16 May 2018, 15:40 (GMT+1, DST)

Quote


Hi, Maarten!
I want to make a "stubby"-like pagoda, and I wonder - will it perform worse if I remove lower small disc and solder the connector right under mid disc of the antenna?

In Quadcopters / Triple Feed Patch Array antenna:

Tagada73

Comment #23: Sun, 13 May 2018, 20:14 (GMT+1, DST)

Quote


Hi Mr Baert what diameter of your new feed patches? Thanks in advance

In SimpleScreenRecorder / Recording for YouTube:

Maarten Baert

Administrator

Comment #24: Fri, 4 May 2018, 11:08 (GMT+1, DST)

Quote


Quote: Ahmadraniri

Sir... I Recently use this software until I upgrade my Ubuntu into 18.04 version, the problem is I can't see the "continue" button, I try to maximize the window but still can't find...

Try installing the latest version of SSR from the PPA:

sudo add-apt-repository ppa:maarten-baert/simplescreenrecorder
sudo apt-get update
sudo apt-get install simplescreenrecorder

This one includes scroll bars.

In SimpleScreenRecorder / Recording for YouTube:

Ahmadraniri

Comment #25: Thu, 3 May 2018, 5:05 (GMT+1, DST)

Quote


Sir... I Recently use this software until I upgrade my Ubuntu into 18.04 version, the problem is I can't see the "continue" button, I try to maximize the window but still can't find...

In Quadcopters / Triple Feed Patch antenna:

Maarten Baert

Administrator

Comment #26: Sun, 15 Apr 2018, 14:26 (GMT+1, DST)

Quote


Quote: Xaled

Hi Maarten,
I was curious if you had any success with 2,45 Ghz design?
The CubeSat communication in S-band 1.98-2.02 GHz and 2.17-2.2 GHz would greatly benefit from an affordable antenna design.

I don't have enough time to redesign this antenna for all possible frequencies. But it shouldn't be too hard to do this yourself, especially if you use the simpler one-port feed network instead of the hybrid LHCP/RHCP version.

In Quadcopters / Triple Feed Patch antenna:

Xaled

Comment #27: Sun, 1 Apr 2018, 20:56 (GMT+1, DST)

Quote


Hi Maarten,
I was curious if you had any success with 2,45 Ghz design?
The CubeSat communication in S-band 1.98-2.02 GHz and 2.17-2.2 GHz would greatly benefit from an affordable antenna design.

In Quadcopters / Triple Feed Patch antenna:

Maarten Baert

Administrator

Comment #28: Sun, 25 Mar 2018, 1:21 (GMT+1, DST)

Quote


Quote: Goatzilla

On the antenna it says, "Keep this area clear".

What exactly does that mean?

For my setup it's easiest if I use a right angle adapter and send the cable out the side. Is that going to cause problems?

No, as long as you keep the cable and connector at least 1 cm away from the tracks it's not going to have an impact.

In Model Creator / Documentation:

Maarten Baert

Administrator

Comment #29: Wed, 21 Mar 2018, 12:15 (GMT+1, DST)

Quote


Quote: Radioactivesean
Help?

I have a slight problem, I like it a lot, but it needs to be on an administrative account to run. It won't work because it is an unknown publisher. Can you please help if I can't figure this out?

Try going into the properties of the Model Creator executable and run it in Windows 7 compatibility mode.

In SimpleScreenRecorder / Troubleshooting:

Maarten Baert

Administrator

Comment #30: Wed, 21 Mar 2018, 12:13 (GMT+1, DST)

Quote


Quote: Burgs

Excellent, much better thanks.
I have put the new video in the same folder - if you can take a look and see if it is as you would expect please. Frame rate was at 35 and CRF 22

Looks good. It's not very smooth but I think that's because of the VM, not SSR.