DIY BiQuad 11dbi antenna tutorial! - Page 44 - RC Groups
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Dec 05, 2012, 01:24 PM
WannaBeLikeJoshTheSlowJet
bakchos's Avatar
Anyone used this from the store, it's a copper sheet in 12x12 made to create circuit, the sheet is made of plastic but the front is a thin copper sheet.

Will this work?
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Dec 05, 2012, 01:29 PM
WannaBeLikeJoshTheSlowJet
bakchos's Avatar
Forgot to attach the pictures
Dec 05, 2012, 02:02 PM
Registered User
I would say absolutely.
Dec 05, 2012, 02:30 PM
400' ..... NOT
Martin Y's Avatar
When your finished making it. Give it a spay of paint or clear to keep it from going green.
Latest blog entry: 1280mhz vs 1090mhz
Dec 05, 2012, 02:38 PM
Still hackin'
Thermicdude's Avatar
^^ What he said
Dec 16, 2012, 12:17 PM
Registered User
tushev's Avatar
Tested mine 2km only so far and works 100% not a single drop of the video strength ! My wife was the test bunny reporting the results.
Dec 20, 2012, 07:59 PM
Can i get a do-over?!?!
JesterKlown77's Avatar
Q: Can I use this antenna for a ground-based UGV? Like a FPV rock crawler?
Dec 21, 2012, 08:05 AM
Engineer for Christ
IBCrazy's Avatar
A: Certainly.
Dec 28, 2012, 11:57 PM
Registered User

OctoQuad CP


May this design works?
Dec 29, 2012, 12:23 AM
Registered User
or this one?
Dec 29, 2012, 12:45 PM
Engineer for Christ
IBCrazy's Avatar
^Your second diagram is it. Take all of your elements and rotate them 45 degrees (in the same direction) for best results as well as a pretty cool look. I have radiation plots and such for this antenna. Plots courtesy of HugeOne

4NEC-2 code:

CM NEC Input File Biquad for 2439 MHz, Pow 20020608 |
CM All data in wavelengths. Scaled to meters with GS |
CM --------------------------[ http://pow.za.net/ ]--'
CE
SY A = .1814' Element dimensions
SY B = A * 2'
SY R = .00317' Wire radius
SY L = R * 2' Gap for soldering to feed
SY H=0.130507' Element height over reflector
SY RX = 1.3' Reflector vertical length / 2
SY RY = RX' Reflector horizontal length / 2
SY RH = .01' Height of reflector sides
SY spacing = 1 'Element spacing
SY para = 0.132
GW 1 10 H .0 L H A A R
GW 2 10 H A A H B .0 R
GX 1 011
GW 9 1 H .0 -L H .0 L R
GM 0 0 45 0 0 0 spacing/2 spacing/2
GM 10 3 90 0 0 0 0 0
SM 12 10 .0 -RY -RX .0 RY -RX
SC 0 0 .0 RY RX
SM 12 3 .0 -RY RX .0 RY RX
SC 0 0 RH RY RX
SM 3 12 .0 -RY -RX RH -RY -RX
SC 0 0 RH RY -RX
GS 0 0 .123
GE 0
EK
FR 0 1 0 0 2440. 0
EX 0 9 1 0 0 -1
EX 0 19 1 0 -1 0
EX 0 29 1 0 0 1
EX 0 39 1 0 1 0
RP 0 73 73 1001 -90. 90. 5. 5. 10000.
EN


-Alex
Dec 31, 2012, 04:50 PM
Registered User
1fullbird's Avatar
I just finished building the Bi-quad for 910 mHz and was researching to see if a Tupper ware container could be placed over it without impacting performance (found the answer was "shouldn't"). However, I noticed others have the active element shielded all the way to the antenna--I didn't. I used an N connector chassis as basis of the build. Is this a fatal flaw?
Dec 31, 2012, 05:20 PM
Registered User
picard10th's Avatar
My 1280 BQ is in sterilite. 11km and counting. I think Alex said keep a certain distance like a wavelength but I don't remember for sure.
Dec 31, 2012, 05:25 PM
WannaBeLikeJoshTheSlowJet
bakchos's Avatar
Quote:
Originally Posted by 1fullbird
I just finished building the Bi-quad for 910 mHz and was researching to see if a Tupper ware container could be placed over it without impacting performance (found the answer was "shouldn't"). However, I noticed others have the active element shielded all the way to the antenna--I didn't. I used an N connector chassis as basis of the build. Is this a fatal flaw?
I will let Alex correct me, but i think your center conductor will not work like this, the feed starts as soon as it leaves the shield of the cable, so you have 2 element running parallel with each other, that antenna will not give you good result at all.

sorry
Dec 31, 2012, 05:29 PM
Registered User
motorhead's Avatar
Would he be able to fix it by adding a piece of brass tube in place of the shield? It would be soldered to the connector.
Mike


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