RE: 2.4ghz 2000mw transmitter and receiver -CHEAP  
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RE: 2.4ghz 2000mw transmitter and receiver -CHEAP - 12/1/2006 12:34:21 AM   
critterhunter



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From: Brook Park, OH, USA
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One more picture...

By the way, the board is smaller than what it looks like while being held in my hand in the photos. Look at the ruler next to it above.

Haven't dove too far into it yet with a volt meter but want to check a few things. Wonder if the OUT DC jack on the thing is passing straight battery power or is being run through a voltage regulator to keep the output steady?

Also, as has been discussed earlier in this thread there is a voltage regulator on the bottom of the board. Still haven't checked the output voltage of that. Wonder also how much power it can handle to run a camera directly off of. Could be risky if the thing gets hot. Even without running something else off it I'd keep an eye on it and see how hot it gets. An extra heat sink may be in order or keep good airflow to it on the plane.

I'm going to assume the TX can be powered directly off a 3 cell lipo since it appears it accepts 9 to 12VDC, and shouldn't drift it's signal as the lipo discharges down to 9V since it features no tuning knob and a lock on channel. Also, the regulator in the TX should keep the voltage level constant to all aspects of the unit?

Would also like to hitch a amp meter up to this thing and see exactly how many amps it's drawing. Don't want to over tax my lipo with the motor at WOT and this thing transmitting.


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RE: 2.4ghz 2000mw transmitter and receiver -CHEAP - 12/1/2006 3:26:59 PM   
daubut


 

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Nice to see the photos of the TX in hack stage 1. I ordered mine yesterday so when it arrives I will start by removing the case and board and start to shave some weight off mine also. I will probably just solder the cable for my cameras AV out directly to the board removing the connectors. I will post some pics when I get the mods done.

I was also thinking that getting the weight down as much as possible would help me be able to install it in a more permanent position closer to the tail of the plane. Trying to get the TX as far away as possible from the RC RX hoping to eliminate interference issues before they arise. I am trying to keep my weight down and trying to keep most additions as close to the CG as possible. I want to try to keep the overall weight of the plane below 6-7lbs. I ordered a larger prop went from a 10X5 to an 11X4 to get a little extra pulling power. With 1.2 hp rating on the OS .46 it should pull the plane nice and docile (I hope).

Do you plane to leave the plastic casing off the TX antenna? If so, do you plane to install the antenna in the foam or have it stick out? I have been looking into the foam planes and some of the homebuilt foamies lately and am intrigued. Did you build your own hot wire foam cutter? I saw a few posts about it and have seen some homemade plans for a few, seem simple enough to make one.

Great info thanks, and good luck this hunting season!

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RE: 2.4ghz 2000mw transmitter and receiver -CHEAP - 12/1/2006 5:10:41 PM   
critterhunter



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From: Brook Park, OH, USA
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quote:

ORIGINAL: daubut

Nice to see the photos of the TX in hack stage 1. I ordered mine yesterday so when it arrives I will start by removing the case and board and start to shave some weight off mine also. I will probably just solder the cable for my cameras AV out directly to the board removing the connectors. I will post some pics when I get the mods done.

I was also thinking that getting the weight down as much as possible would help me be able to install it in a more permanent position closer to the tail of the plane. Trying to get the TX as far away as possible from the RC RX hoping to eliminate interference issues before they arise. I am trying to keep my weight down and trying to keep most additions as close to the CG as possible. I want to try to keep the overall weight of the plane below 6-7lbs. I ordered a larger prop went from a 10X5 to an 11X4 to get a little extra pulling power. With 1.2 hp rating on the OS .46 it should pull the plane nice and docile (I hope).

Do you plane to leave the plastic casing off the TX antenna? If so, do you plane to install the antenna in the foam or have it stick out? I have been looking into the foam planes and some of the homebuilt foamies lately and am intrigued. Did you build your own hot wire foam cutter? I saw a few posts about it and have seen some homemade plans for a few, seem simple enough to make one.

Great info thanks, and good luck this hunting season!



Yea, after having this TX sit around collecting dust for a good year it's nice to be toying with it. When I bought mine I think it was like $50 or $60 and that was (and still is) a great price for a 2.4ghz 2 watt system. Now that it's thirty some dollars how can you go wrong?

Don't know if I'll remove the RCA and power jacks yet or not. I would like to take off that plastic elbow and nut though because they serve no useful purpose without the TX case. If anybody figured out how to remove them without desoldering the antenna let me know. I expect you could heat up an exacto knife and slit the plastic eblow down it's side. As for the nut you could dremel it off or something.

The AP foam plane I'm building should be able to lift this thing with no problem on a tiny CMOS or CCD camera and probably even with my Aiptek 5100M (4 ounces) pocket camcorder if I want to plug that into it. The foamie AP ship I'm building currently has a 48" wing and wing loading at the moment looks like it will fall between glider and trainer loads. However, if the weight gets a bit higher than I want I'll just hot wire out an even bigger wing to slap on it to get the wing loading about where I want it.

Good idea to move it as far away as possible from the RX antenna. On the other hand, using a good full range interference blocking RX such as a JR Sport should probably eliminate any concerns. I'd play it safe and do a VERY far away range test with a buddy watching the plane so you can be sure the RX still has control. Drive a block or so away and play with the TX as he watches what the plane is doing on the ground. As an added precaution I'd give the plane some right turn in the trims before launch. That way if the thing does loose contact it will start doing lazy circles until you can get close enough to regain control. The motor should automaticly shut down on most ESCs if it looses the signal so that won't be a concern.

As far as the antenna goes I'm going to leave the plastic sleeve off. Like I said, the antenna wire is real flexible and shouldn't break or loose it's shape even if you cranked it from end to end in a loop. When I mount it on the plane I'm probably going to stick it straight up and down inside the foam and sticking out the top of the fuse. I'm not too worried about protecting it, just keeping it in one position in a way that it won't flop around on me. If I decide to mount the TX on top of the wing the antenna will either point straight up or be horizontal trailing towards the tail. Some people report better reception on other transmitters by having the antenna sideways, others straight up. The main thing is to position your camera RX in the same way on the ground. I'd also mount the RX on top of a four or five foot PVC pipe you stick in the ground just to give it the best chance of not seeing interference. Probably not a big concern with this powerful of a unit.

Yep, made myself a homemade hot wire bow and a hot wire table bandsaw style cutter. Both are VERY simple to make and cost just about nothing if you have the parts laying around in the garage. You can go to the thread called "Here's A Simple A FREE Foam Build Plan! Cool Looking Plane Too..." in the foamie forum and read that. WARNING: I'm very long winded in my messages on there but others helped me walk through building a foam cutter, wing jig, and that plane. All the info you need is there. Later on, towards the end of the thread, you can see my final third build version of that plane complete with photos and step by step build instructions. While I'm not using that plane for my AP I think it would be the perfect platform for it. Just scale it up in size to whatever you want wing wise. Dual booms, single aileron, and an elevator type setup. My current AP foamie build is in the other thread in this AP forum under "Homemade Foamie AP Platform" or something like that.

Once you get into hot wire cutting foam bodies it will become an obsession. You learn so much more about planes, how they fly, and some rather good build skills as well. Saves you a ton of money and also gives you added satisfaction when you fly something you built from scratch.



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       Post #: 128

RE: 2.4ghz 2000mw transmitter and receiver -CHEAP - 12/4/2006 6:28:46 AM   
dzbum



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I am still waiting to see someone do a range test on this tx more than just a quick walkabout. I doubt it is a 2w tx but it could be enough to work well. Daubut did you receive the one you orders yet ? I would be interested to see what you think. Like you said for the price if it is only good for none RC stuff then nothing much lost.

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RE: 2.4ghz 2000mw transmitter and receiver -CHEAP - 12/4/2006 1:20:41 PM   
daubut


 

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quote:

Daubut did you receive the one you orders yet ? I would be interested to see what you think. Like you said for the price if it is only good for none RC stuff then nothing much lost.


I haven't recieved mine yet. I haven't gotten an email from the seller saying he shipped it yet. I will post as soon as I get it. Plan to do same range/antenna testing as soon as Iget though.

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RE: 2.4ghz 2000mw transmitter and receiver -CHEAP - 12/6/2006 1:36:45 PM   
critterhunter



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Based on a few other transmitters I've peaked at the internals on I'm willing to bet this thing is 2 watt or at least very close to it. Either way, I'm sure it's more than powerful enough to handle any kind of distance you want to fly at, even at some further fly-by-wire flights that are out of visual sight. However, a good way to get a general idea to it's output would be to hitch an amp meter up to it and see just how much current it's drawing. I would figure there is some type of formula to figure if it's at least close to the power output it claims. I'd also like to do an amp meter reading on it anyway just to judge how much load it's putting on my plane battery. Might be a good idea if your lipo is barely able to handle the amp draw of your motor at WOT.


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RE: 2.4ghz 2000mw transmitter and receiver -CHEAP - 12/6/2006 10:56:00 PM   
trireme


 

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Based on the current consumption rated at 12v 500ma, it is likely that this unit is more around 200mw, not 2000mw. 200mw with good clear line of sight, should go 1000ft. Most 2 to 3 watt broadcasters draw more power then that.

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RE: 2.4ghz 2000mw transmitter and receiver -CHEAP - 12/7/2006 3:39:27 AM   
critterhunter



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Hmmmm.....Now I'm going to have to test mine for myself to see. A TX this large that gets this hot (heat sink the voltage regulator on the bottom!) shouldn't be just 200mw. I know my 800mw unit isn't 1/5th the size of this thing. Yet, the proof is in the numbers and not just superficial observations. I'll check a few things and post some info...


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RE: 2.4ghz 2000mw transmitter and receiver -CHEAP - 12/7/2006 11:29:52 AM   
trireme


 

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http://www.ayagroup.com/product_info.php?products_id=1450

Looks kinda like this? But this says 0.1w rf power...

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RE: 2.4ghz 2000mw transmitter and receiver -CHEAP - 12/7/2006 5:08:16 PM   
dzbum



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It would be nice to think this was a 2w TX but I agree that it is too good to be true. Given that it draws 500mA @ 12v I think 100mW-200mW range is probably more likely.
Has anyone had experience with cheap 1.5w TX's from China that they sell on Ebay.
Ebay Tx link

I think this is probably a true 1.5w but I would like to hear from someone who has seen one in use or tested one.

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RE: 2.4ghz 2000mw transmitter and receiver -CHEAP - 12/7/2006 7:15:24 PM   
critterhunter



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I know Randall had the 1.5w unit and he said this 2w unit was the same thing as far as he could tell as the internals looks very similar. Either way, I'll report back when I have something to add.


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RE: 2.4ghz 2000mw transmitter and receiver -CHEAP - 12/11/2006 2:36:32 PM   
critterhunter



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Did some more weight savings measurements on the TX. I used a dremel to remove the metal nut and plastic elbow sleeve at the base of the antenna. The main sleeve just pulls right off but you have to slit the elbow and nut to get them off. There is plenty of room in there to not hit the antenna or it's little board near it's base so just take a little care with a cutting disc on a dremel or something. Without the elbow/nut the TX now weighs 2.6 ounces (75 grams). That compares to 2.8 ounces (78 grams) for the TX without those components removed, and 2.9 ounces with the main antenna sleeve still on as well.

There is still plenty of weight savings to be had. For instance, on top of the video jacks there is extra white plastic (can be seen probably in the above pictures) that has empty mounting screw holes in it. You can heat a knife or dremel that off as well, which I plan to do. At least two or three of the board's corners have way extra wasted space on them where the main ground trace (very wide) is. If you cut off those corners without cutting through the entire trace you should save some more weight. There are various other things that could be hacked off the board to get the weight lower, probably under 2 ounces...Such as removing the video/audio jacks and wiring the camera directly to the board or using a servo plug to hitch the camera up to it. The DC in/out jacks could also be removed and wired directly to the board or by using a mini plug such as a servo harness. Not sure if I'm going to do those things as the weight is pretty good as it is.

My next step is to check the amp consumption of the board. My main concern if anybody knows is how much current standard servo plug wires can handle? I've already got a servo plug wired directly to my plane's battery leads that I plan to run my Aiptek 5100M pocket camcorder off of, and perhaps this TX with a CCD camera when the camcorder isn't installed.

Again, I'd probably add an extra heat sink to the voltage regulator and/or the other component on the bottom of the board if they seem to get hot while test bedding.

As for the anenna, I'm planning to glue it directly to the side of the TX board to keep it in one place. At the moment I'm thinking the antenna will be pointing straight down toward the ground but am not sure which orientation is best for a strong signal. Which way do people normal point the TX antenna and what's the proper position for the ground antenna?


< Message edited by critterhunter -- 12/11/2006 2:40:44 PM >


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