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Old Mar 29, 2010, 06:39 AM
Don't leave it Stock
mrfliboy's Avatar
USA, IL, Round Lake
Joined Feb 2004
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Alex,

Thanks so much for all the information you've given us all. I see you'll be getting a pair of the great trimersion goggles???

If so I've already been playing with the 2.4 wireless that comes with it. Terrible quality on the antenna's. One was almost 3/8" longer than the other.

Am I safe to assume both tx and rx should have identical antenna's?

I found if I touch the ant on the Tx (base unit) I got clear good picture. This base unit had the shorter of the 2 antenna's. I soldered on a ext of 1/2" or so and improved the range to 5' or so. Not the clearest reception tho.

Frequency is 2.468 with all switches in off position. At least that's what works with the Flytron 50mw Tx. Which states default ch. 4 is 2.468.

Interested if you will be playing with the wireless aspect of the Trimersion?

Thanks
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Old Mar 29, 2010, 07:35 AM
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IBCrazy's Avatar
Amherst, VA
Joined Jun 2006
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I'm on 910 MHz so I will be embedding my 910 MHz module in my system. However once I get my Trimersion goggles, I will inspect the antenna and see if there is any way I can improve it for you 2.4GHz guys.

For now, you can improve it this way:

The antenna lengths (in inches) should be 2808/f in MHz

So your antennas should be 1-1/8" long and have a total length of 2 - 9/32" for a center fed dipole. You could also make a base loaded dipole of length 2-9/32".

-Alex
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Old Mar 29, 2010, 07:47 AM
Don't leave it Stock
mrfliboy's Avatar
USA, IL, Round Lake
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Thanks Alex,

heres apic compliments of Kamikazee of the base unit.
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Old Mar 29, 2010, 01:16 PM
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Quote:
Originally Posted by IBCrazy View Post
That is some really high gain. Do you really want that much of a directive antenna? Sure it will work. Yagi's are excellent antennas. However that is suited mainly for long range flights in one direction. If you plan on flying around more, I'd recommend 5 or 9 dbi.

However, if range is your goal, buy it with an SMA connector (so it can connect to your RX and fly it. It will work well if you are flying a 2.4 GHz video link.

-Alex
I have the EE and was going for this and a 9db whip...

also want to try ur v antenna on rx....yes i fly 2.4ghz...

should I go with a lower gain on the whip also..?

I thought with the tracker the yagi would work nice when i'm "out there".

any thoughts....?

what size do i need for the homemade v..? and does the one side solder to the middle and the other is the outside ground..

also the place that sells the antennas has RP connectors on all there stuff...
that's Reverse polarity right..wont work huh...y do they recommend these for the wifi..?

sorry so many ???.. gotta know things..

tkx
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Old Mar 29, 2010, 02:42 PM
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Quote:
Originally Posted by mrfliboy View Post
Thanks Alex,

heres apic compliments of Kamikazee of the base unit.
You can make either antenna. Try a 30 degree Vee with the 1-1/8 elements, then try a base loaded dipole with a single 2-9/32" antenna element. Use whatever one works best. I can't say which that will be. My guess would be the Vee would work better.
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Old Mar 29, 2010, 02:50 PM
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Amherst, VA
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Quote:
Originally Posted by RocketJoe View Post
I have the EE and was going for this and a 9db whip...

also want to try ur v antenna on rx....yes i fly 2.4ghz...

should I go with a lower gain on the whip also..?

I thought with the tracker the yagi would work nice when i'm "out there".

any thoughts....?

what size do i need for the homemade v..? and does the one side solder to the middle and the other is the outside ground..

also the place that sells the antennas has RP connectors on all there stuff...
that's Reverse polarity right..wont work huh...y do they recommend these for the wifi..?

sorry so many ???.. gotta know things..

tkx
Joe,

Please read the first page of this thread carefully. It explains where each antenna is best used and explains how to calculate your antenna element lengths. It is actually really easy. And yes, one end of the antenna is hooked to the center pin and the other goes to ground. The two are not connected in any way. The ground element acts as a reflector. I cannot tell you the lengths of your element since I do not know your exact frequency. 2.4GHz is not accurate enough. I need three digits past the decimal to give you a good value, such as 2.446GHz.

High gain antennas should not be used on the airplane, but on the ground they are ok. Remember HIGH GAIN DOES NOT MEAN MORE POWER. IT MEANS MORE DIRECTIVITY. If you can't aim the antenna properly, don't use it.

That said, if using an antenna tracker, I would opt for the 9dbi Yagi. You will be well out of transmitter range before your video feed drops out. You might also want to visit my build your own diversity controller thread. The links are in my blog.
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Old Mar 29, 2010, 03:08 PM
Don't leave it Stock
mrfliboy's Avatar
USA, IL, Round Lake
Joined Feb 2004
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Quote:
Originally Posted by IBCrazy View Post
You can make either antenna. Try a 30 degree Vee with the 1-1/8 elements, then try a base loaded dipole with a single 2-9/32" antenna element. Use whatever one works best. I can't say which that will be. My guess would be the Vee would work better.

Thanks again,

Quick measurements on stock setup Trimersion base 1- 5/8"

My first 2.4 Lorex unit 2-5/16"

your numbers are spot on for a higher quality FCC unit

I'll be testing in the next day or so. Thanks
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Old Mar 29, 2010, 05:18 PM
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IB....

tkx for info....
yea i understand about direction on high db.....
as for the freq. for 2.4ghz..how do I get that.??
I had a lot of equipment but lost it all in a lipo fire...oh yea..fell asleep ..woke up in time to see smoke coming from my workshop/new apartment...totally gone lost it all..!!

anyway ..is there any way to ck freq..easy???

tkx

will read other thread..too
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Old Mar 29, 2010, 09:12 PM
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etman's Avatar
Eagle's nest
Joined Nov 2008
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I broke my only TX antenna in a Tricopter crash.
It went upside down and landed on the antenna.
The plastic base broke.

Well, it a great incentive to do this DIY mod.
Crash and build!
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Old Mar 29, 2010, 09:48 PM
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Amherst, VA
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Quote:
Originally Posted by RocketJoe View Post
IB....

tkx for info....
yea i understand about direction on high db.....
as for the freq. for 2.4ghz..how do I get that.??
I had a lot of equipment but lost it all in a lipo fire...oh yea..fell asleep ..woke up in time to see smoke coming from my workshop/new apartment...totally gone lost it all..!!

anyway ..is there any way to ck freq..easy???

tkx

will read other thread..too
Perhaps you know what channel you are on? If so there are many people here on RCG who know the exact frequency of those channels. Unfortunately I'm not one of them You could post your set up here and perhaps somebody would know.

-Alex
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Old Mar 30, 2010, 02:22 AM
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freq

Quote:
Originally Posted by IBCrazy View Post
Perhaps you know what channel you are on? If so there are many people here on RCG who know the exact frequency of those channels. Unfortunately I'm not one of them You could post your set up here and perhaps somebody would know.

-Alex
yea im mostly on ch 1 but can do 2

tkx and i hope to get this setup soon...setup the EE and it seems ok..
just find it a little "long" to get the darn thing to adjust...

tkx again
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Old Mar 30, 2010, 10:19 AM
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I just checked the channel chart on Wikipedia. It appears channels 1 and a are 2414MHz and 2417 MHz.

Your element lengths follow the formula 2808/F in MHZ

So:

2808/2417 = 1.16177" or 1 - 5/32"

Total antenna length should be 2 -5/16" for a dipole.

If making a Vee, I would make the elements 1-1/4".

Get out your calipers for this. Higher frequencies are more critical with measurments.

-Alex
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Old Mar 30, 2010, 10:33 AM
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Quote:
Originally Posted by IBCrazy View Post
I just checked the channel chart on Wikipedia. It appears channels 1 and a are 2414MHz and 2417 MHz.

Your element lengths follow the formula 2808/F in MHZ

So:

2808/2417 = 1.16177" or 1 - 5/32"

Total antenna length should be 2 -5/16" for a dipole.

If making a Vee, I would make the elements 1-1/4".

Get out your calipers for this. Higher frequencies are more critical with measurments.

-Alex
great ill get out my digital on and have at it..

tkx
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Old Apr 01, 2010, 12:25 AM
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etman's Avatar
Eagle's nest
Joined Nov 2008
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Hi,

My video RX is the Rangevideo 1.3 Ghz 300 mW.
Please help me point out where is the RSSI pin and where is the ground pin.
Here is the photo of the insides. Sorry it is quite blurry.
Thanks.
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Old Apr 01, 2010, 12:48 AM
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Panama City Bch, FL
Joined Jan 2009
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Quote:
Originally Posted by etman View Post
Hi,

My video RX is the Rangevideo 1.3 Ghz 300 mW.
Please help me point out where is the RSSI pin and where is the ground pin.
Here is the photo of the insides. Sorry it is quite blurry.
Thanks.
see Martin Y's post here
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