Location
Swakopmund
About
About Me:
Software/Hardware Engineer, Aircraft designer.
Please tell us a bit about your UAV interest
UAVs in civilian aerial photography and Anti-Poaching applications
Hometown:
Swakopmund
Activity Feed
"Been there, Done that....
https://diydrones.com/profiles/blogs/a-large-scale-variable-pitch-t...
Joe"
https://diydrones.com/profiles/blogs/a-large-scale-variable-pitch-t...
Joe"
Check this out:https://www.youtube.com/watch?v=Sgd0i87r9-0&app=desktop
I see the FCC have hammered HobbyKing in a BIG way on their 2.4GHz RCS RF Modules. I guess what's Right is Right, just wondering why they have been singled out - I wonder if ANY of the myriad of other RF 'modules' used by all and sundry are are…
"This would get rid of gears, extra bearings, and mechanical complexity...
http://diydrones.com/profiles/blogs/tail-boom-co-axial-brushless-mo...
OR-
http://diydrones.com/profiles/blog/list?user=2ma4txaue2x6b
The 'plane looks good - nicely done.…"
http://diydrones.com/profiles/blogs/tail-boom-co-axial-brushless-mo...
OR-
http://diydrones.com/profiles/blog/list?user=2ma4txaue2x6b
The 'plane looks good - nicely done.…"
"Now that's the DIY spirit! Beats the rest hands down!
Well done.
The Nampilot"
Well done.
The Nampilot"
"John, the problem is that achieve the radiation pattern you allude to, you have to have a ground plane that is at least a 1/2 wave long per side, or 1/2wave diameter if a circle. You can make the ground plane from 3 or better, 4 wire elements, each…"
"Hi Anton,
Anton, I think you are over-complicating the issue. The issue of coax cable lengths is unimportant for this discussion - the fact that your coax is longer than 1/8 Lambda is not a problem. It can be any length desired and has no effect on…"
Anton, I think you are over-complicating the issue. The issue of coax cable lengths is unimportant for this discussion - the fact that your coax is longer than 1/8 Lambda is not a problem. It can be any length desired and has no effect on…"
"Anton, do not get mislead yet. You have not answered my questions and we need to eliminate the items constructively. Your results were good or better with the SAME dipole, when you had the modem separated and shielded and powered from a separate…"
"Not proven yet - Anton had good GPS fix with the SAME dipole, with the rest of the items shielded and powered separately. That already implies it is not the Dipole or its matching...Lets not confuse the issue here with unproven concepts.
Anton, you…"
Anton, you…"
"Hi Anton,
Well, seems there are things to be learnt here. What is important is to be methodical - Maybe you can just explain more precisely what you did-
- Packing the modem in aluminum foil: noticable improvement: 7 sats after 10-20 seconds.
Where…"
Well, seems there are things to be learnt here. What is important is to be methodical - Maybe you can just explain more precisely what you did-
- Packing the modem in aluminum foil: noticable improvement: 7 sats after 10-20 seconds.
Where…"
"Hello Hein,
Could be due to a number of factors:
At 1.2GHz the RF Skin depth is approx 0.001mm ie, 1um. The copper thickness on the PCB was probably at least 2oz, ie, 35um, so no detrimental skin effect issues here. The fact that it is flat strip -…"
Could be due to a number of factors:
At 1.2GHz the RF Skin depth is approx 0.001mm ie, 1um. The copper thickness on the PCB was probably at least 2oz, ie, 35um, so no detrimental skin effect issues here. The fact that it is flat strip -…"
"Hello Trung.
You are quite correct. Tubing is more often used in the lower frequencies, since the element lengths are greater, and to have sensible L/D ratios, so the diameters must increase. The only way then is to use thin wall tubing to keep…"
You are quite correct. Tubing is more often used in the lower frequencies, since the element lengths are greater, and to have sensible L/D ratios, so the diameters must increase. The only way then is to use thin wall tubing to keep…"
"HI Anton,
Photos are a little fuzzy - I guess you could not get focus closer with the lens?
Th photos are however clear enough to show there is no lowpass filtering at all, just a simple Pie matching network to the antenna connector, so that is not…"
Photos are a little fuzzy - I guess you could not get focus closer with the lens?
Th photos are however clear enough to show there is no lowpass filtering at all, just a simple Pie matching network to the antenna connector, so that is not…"
"Hi Anton,
sorry , you need to acknowledge my friend request before I can message my email to you...
Joe"
sorry , you need to acknowledge my friend request before I can message my email to you...
Joe"
"Hi Anton - Can you take a good close-up photo of the component side of the modem please? I have sent you a message with my email address so you can send the photo(s) in high res please...
Take some of the complet modem, and then of the area close to…"
Take some of the complet modem, and then of the area close to…"
"Hello Anton,
Anton, I suspect there are a number of issues here, but the main culprit is most likely high levels of RF harmonics getting into the GPS receiver.
However, before digging deeper, a few more questions:
What is the make/model of the…"
Anton, I suspect there are a number of issues here, but the main culprit is most likely high levels of RF harmonics getting into the GPS receiver.
However, before digging deeper, a few more questions:
What is the make/model of the…"
