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Old Sep 28, 2014, 08:10 AM
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Joined Aug 2014
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What FPV setup that would work through buildings?

Hi!
I've been flying my Phantom 2 with an 5.8GHz ImmersionRC 600mW video tx (CP antennas) and finding the range an interference not up to scratch.
Open field, video up to 600-700m.

Did a test around an abandoned building that is mostly empty, just pillars left, I was losing video even though I had LOS, ~50m distance.
I guess it's the reinforced concrete, but still didn't expect to lose video so quickly and so close.

Ahem, getting to the point, I'd like to switch to a lower freq video tx.
AFAIK 1.2GHz isn't available in my country, so that leaves me with 900/2.4GHz.
900MHz seems problematic for video (according to various posts on the forum) and I'm also afraid about the interference from GSM towers as they're on 900MHz.

I've seen lawmate 2.4 highly recommended, and I'm leaning towards that.

I have 2 goals, that may be mutually exclusive:
  1. flying around buildings, so that I don't lose video if I go behind a building, where IMO directional antennas won't be of much use
  2. long range open fields, mountains etc..

Currently I have just one P2 but that may change soonish.

I'll be switching to UHF for the control link, possibly OrangeTX but not yet settled.

Links and advice welcomed!
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Old Sep 28, 2014, 11:37 AM
A man with too many toys
United States
Joined Feb 2001
17,780 Posts
FrSky Long range 2.4 radio would be best for control.

900 will be the best for video. The only problem with 900 is the limited number of channels so if others in your area use 900 video you will have to coordinate with them.


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Old Sep 28, 2014, 12:34 PM
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Originally Posted by RC Man View Post
FrSky Long range 2.4 radio would be best for control.
900 will be the best for video. The only problem with 900 is the limited number of channels so if others in your area use 900 video you will have to coordinate with them.
Why control on 2.4 not 433?

I have to sit down and research properly (crappy gov't websites don't make that easy) if even 900 is available for public use. For now lets say its not
BTW how big does a band have to be for video?

I've got a Taranis with X8R that is waiting to be installed and tested so FrSky compatible modules are a plus.

I'll be flying alone so other RC pilots won't be an issue.
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Old Sep 29, 2014, 03:35 AM
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Romania, Dolj, Craiova
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Flying near building is one of the main reasons of our today issues that led to this hobby regulation.
Please, find another place to fly, try replacing building pillars with trees.
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Old Sep 30, 2014, 06:45 PM
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bingo17's Avatar
Auckland, NZ
Joined Sep 2009
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Quote:
Originally Posted by renatoa View Post
flying near building is one of the main reasons of our today issues that led to this hobby regulation.
Please, find another place to fly, try replacing building pillars with trees.
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Old Sep 30, 2014, 07:00 PM
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Originally Posted by renatoa View Post
Flying near building is one of the main reasons of our today issues that led to this hobby regulation.
Please, find another place to fly, try replacing building pillars with trees.
I think you got that a bit backwards, the low entry point and every one buying them is what is getting the headlines and regulation.

The point of being reckless is that you do not think it through so I doubt that the folks you're referring to would be here on the forum in the first place.

So please don't prejudice.
If you have advice with regard to the topic, please share.
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Old Oct 04, 2014, 08:42 AM
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This one works pretty well through buildings.

Smart Bombs (0 min 33 sec)
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Old Oct 04, 2014, 09:49 AM
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Originally Posted by 747Pilot View Post
This one works pretty well through buildings.
Right, funny.

Currently I'm looking to upgrade my quad to be able to properly and safely document the industrial heritage in my area.
Hence this thread.

I was filming the first torpedo factory in the world, well the test launch site which is all that is left now.
The reinforced concrete pillars severely impeded my video range.
I'm guessing it will be similar with other sites I plan on filming.

I don't understand the backlash as it's all based on wrong assumptions. By definition abandoned buildings are safe to fly as there is no one there.


Back on topic, it seems I'll have to get 1.2 and 2.4 and just test them out and have more options.
I've been looking at lawmate, their 1w versions are 30g vs 10g for 500mw and there is a fair bit of tuning to do as well.

I think I'll go with the 1.2 version first, as that seems most flexible and would allow me to keep the 2.4 FrSky control.
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Old Oct 04, 2014, 11:33 AM
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Conversely, 1W in 1.2G onboard make Frsky RC life very hard...
I would use antenna diversity instead, low power, and some 3-4 antennas/Rxes intelligently placed to have LOS with drone in any position And a very low power, even 100mW is enough indoor.
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Old Oct 04, 2014, 07:08 PM
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United States, NE, Omaha
Joined Nov 2011
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If this is the building its been around for quite sometime. If you go down is it safe to retrieve?

First Torpedo Factory In The World - Rijeka - Fiume (3 min 7 sec)
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Old Oct 06, 2014, 01:08 PM
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Quote:
Originally Posted by renatoa View Post
Conversely, 1W in 1.2G onboard make Frsky RC life very hard...
I would use antenna diversity instead, low power, and some 3-4 antennas/Rxes intelligently placed to have LOS with drone in any position And a very low power, even 100mW is enough indoor.
I gathered that 1.2 VTX and 2.4 don't mix well. I'll have to try and see if it can be helped with a notch filter.

In the mean time I ordered a HK OpenLRS RX/TX.

WRT antenna diversity, I don't get what you're aiming at? Are you proposing I should build a network of RXee to repeat the signal? Not plausible.

Quote:
Originally Posted by 1fullbird View Post
If this is the building its been around for quite sometime. If you go down is it safe to retrieve?
It is indeed, but it has deteriorated much since this video was taken.
Definitely not safe, but then again, what is.
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Old Oct 06, 2014, 01:20 PM
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Lakewood, Colorado
Joined Aug 2002
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Dunno why so much bad advice in this thread.
2.4Ghz is a very poor choice for penetration, as it 5.8Ghz video as you know.

The best you're going to do is 433Mhz UHF control, and 900Mhz video, with
CP antennas on both sides to reduce multi-pathing (although you'll never eliminate it).
900Mhz CP antenna is going to be quite large for
a Phantom though. No matter what you choose, reinforced concrete will
always be a problem. Any metal mesh will largely block the frequencies we use.
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Old Oct 06, 2014, 01:57 PM
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My understanding and knowledge about big industrial buildings is as a lot of pillars but not so many walls. that's why I proposed a small network of antennas/receivers placed at some meters each others, whose output feed a 4 way diversity switch unit.
If appropriate placed, at least one antenna/receiver should have LOS with drone in any position in the building. But you will need a bit of math modeling and an exact plan of the building.
Not repeaters.
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