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HomeAircraftHelicopterAerial Photography and Video › Spektrum and AP
03-03-2008 04:14 PM  10 years agoPost 1
aambrose

rrElite Veteran

Pana, IL

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I know this has been tossed around several times, but I was wondering if I could get updated opinions from those of you who are using (or have used) the Spektrum system in your AP setup. More specifically, those who have experience with Spektrum and a 900MHz downlink system (or other frequency). What are your thoughts and opinions?

Thanks!


Tony

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03-03-2008 04:24 PM  10 years agoPost 2
kiwidave1

rrVeteran

Seattle, WA

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I use the X9303 and range video 900mhz downlink.

I have had zero problems with the AR9000 Rx (knock on wood, throw salt over my sholder, etc, etc) but did have some earily problems with the 7 channel Rx on my trex 600 that are now resolved (discovered on the bench on install so no damage).

The antennas that came with the 900 system were very weak past 75 feet, but I brought a patch antenna and 2 large (huge, 16" long) 5db antennas for the mounts and have a very good image when flying now.

I like the 2.4/900 package, I fly in an urban enviroment and up to 400 feet up and 400 away . I have the data logger for the AR9000 and I get maybe 1-2 fades on one antenna with the other 3 normally at 0.

I now have a lot of confidence in the system and the peace of mind was worth the change over from 72/2.4

Hope this helps.

David

Never underestimate the power of stupid people in large groups.

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03-03-2008 05:48 PM  10 years agoPost 3
kookboy

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Vancouver, BC

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DX7 with 900mhz rangevideo downlink.

Just like David, zero issues and am confident in the systems working side by side.

Jesse

... But honey it was only $$$

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03-03-2008 05:49 PM  10 years agoPost 4
iedit4tv

rrApprentice

Santa Clarita, California

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Hey David,

I just purchased a 900mhz system to replace my 2.4ghz downlink. You mentioned your 5db antenna on your mount as well as you patch. Do you have any pics or can you direct me to the site where you purchased you moded antennas?

Thanks,
Mike

Cut - Print - It's a wrap!

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03-03-2008 06:31 PM  10 years agoPost 5
kiwidave1

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Seattle, WA

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I brought mine from http://www.hyperlinktech.com/web/antennas_900.php

But just beware, these things are large at 16" long. I also order 2' SMA cables so I could lay the antenna across the skids of the mount and have the Tx unit above the cradle.

I am sure there is a better, lighter way to get great reception but I ordered these antennas before I realized how long they are, they work and the maxi doesn't notice them, so I'm happy with them.

I also stick out the antenna on the 360 mount about 9" so it is easy for me to see which way the camera person is pointing the mount even above 400' (If I was to go that high, which of course I don't because that would be breaking the rules......)

Cheers!

David

Never underestimate the power of stupid people in large groups.

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03-03-2008 06:50 PM  10 years agoPost 6
snurre

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Sweden, Stockholm

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I do not have the experience you are asking for but I wanted to you to check this out:

http://www.spektrumrc.com/Products/...rodID=SPMAR9100
I believe that this adds some extra failsafe capacity, very much desirable for AP pilots who needs ultimate reliability. I will install this on my incoming MaxiJoker2. For power feeding I intend to use two separate 2S2300mAh A123 packs.

For the video I will use a 5.8GHz downlink from wirelesscameras.com. Any of you having experience from their products?

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03-03-2008 07:20 PM  10 years agoPost 7
rroback

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Irvine (UCI), Ca

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I've been flying my maxi 2 with 2.4 almost since day one of the Dx7's coming out, with 900mhz downlink. I'm now flying faast, still with the 900mhz downlink.

Rhett..... I can't fly, but the Profi sure can.

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03-03-2008 07:54 PM  10 years agoPost 8
HakimG

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Germany

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Anyone know of a good 900mhz downlink source in Europe?

Hakim

___________________________________________________________
Acrobat SE and DX7

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03-03-2008 08:24 PM  10 years agoPost 9
aambrose

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Pana, IL

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Does anyone care to share some pics of their 2.4 installation on their helis?

Thanks!


Tony

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03-03-2008 10:44 PM  10 years agoPost 10
pery

rrNovice

Sweden

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Hakim
I do not believe it is legal to use anything near 900MHz in europe. Check with your telecommunication authorities. It´s were the mobiles (cellphones) still are gathered, plus 1800MHz etc.
Either you have to go 1,3GHz or 5,8GHz but they can be restricted.
And its off 2,4GHz wich is good.

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03-04-2008 01:02 AM  10 years agoPost 11
Autoeject

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Ashtabula, OH, USA

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The antennas that came with the 900 system were very weak past 75 feet
That's wierd. I get decent signal at better than 600' w/factory antenna. My only complaint about the Range system is the occasional LOS in the downlink. It acts like a loose connection but I can't isolate it.

Mark Webber
wai-rc.com
Spartan RC Distributor
Outrage Helicopters

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03-04-2008 01:09 AM  10 years agoPost 12
W4UAV

rrApprentice

Gainesville, FL

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I use the DX7 and 900mhz 100mw transmitter on the helicam, DX7 and 900mhz 500mw transmitter on my MagpieAP(camera plane) I get great range on both, both are Rangevideo.
You can never tell what RF conditions are going to be like on site, so having the spread spectrum control is very reliable.
Mike

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03-04-2008 02:56 AM  10 years agoPost 13
kiwidave1

rrVeteran

Seattle, WA

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Mark, are you doing dense urban enviroment flying?? (or is that densely flying in an urban enviroment ) I found even with prime antenna position anything out past 100feet would cut in and out making it really unusable.

Since I changed antennas it has been solid, so I know the units are good.
That said I did change the Tx antennas at the same time as the Patch antenna so there is a possibility that I only needed to change the Rx antenna but I haven't tried the original Tx antennas with the patch antenna.

antenna, antenna, antenna, antenna, antenna..lol crazy word when you say it too much

David

Never underestimate the power of stupid people in large groups.

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03-04-2008 10:13 AM  10 years agoPost 14
Autoeject

rrKey Veteran

Ashtabula, OH, USA

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Dave,

Guess that would be all in how you look at it.

In line of site, it has good range. Now, when my camera operator tried to stay in the van at the last shoot to stay warm, he was constantly loosing signal. Doesn't get through steel well, apparently. It would probably be to our benefit to have the patch antenna and put that on the roof. The stubby on the rx gets obstructed to easily.

Mark Webber
wai-rc.com
Spartan RC Distributor
Outrage Helicopters

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03-04-2008 02:54 PM  10 years agoPost 15
aambrose

rrElite Veteran

Pana, IL

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Everyone's input is appreciated. Glad to hear 2.4 and 900 is working for several people.

Thanks!


Tony

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03-04-2008 03:26 PM  10 years agoPost 16
rotoryrob

rrVeteran

Auburn WA

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hey Tony that is where my Antenna is on the roof and it works great. I have a temporary mount so that I can remove it after the shoot. I have a pull down monitor inside so my camera person can stay warm while I freeze my but off outside....LOL. So far so good strong signal with just the lil 900 mghz antenna. But most of my shots are only 200-400ft up. I too use a E-logger and so far things are good. It could just be that I am flying an Ion-2 though....LOL!! backed up with a maxi joker.

Rotoryrob

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03-04-2008 08:07 PM  10 years agoPost 17
aambrose

rrElite Veteran

Pana, IL

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Maybe I should also ask if anyone has had any problems using 2.4 on the heli and 900 on their downlinks (or 5.8). Sounds like several people have been using the 2.4/900 combination with success.

Thanks!


Tony

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03-05-2008 12:11 AM  10 years agoPost 18
Autoeject

rrKey Veteran

Ashtabula, OH, USA

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Hey Tony,

Mine works well but I'm keeping the antenna's at a respectable distance from each other so the 900 doesn't swamp the heli rx. When they were in close proximity(less than 4 or 5 inches), my heli tx/rx range was reduced more than I care for.

Mark Webber
wai-rc.com
Spartan RC Distributor
Outrage Helicopters

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03-05-2008 02:32 AM  10 years agoPost 19
aambrose

rrElite Veteran

Pana, IL

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Thanks Mark for your input!


Tony

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