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Old Jul 09, 2012, 09:50 PM
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Originally Posted by mandis View Post
hi Alex!
will this biquad works on 5.8?
i searched but not much info..
thanks in advance
mandis
If you can build it at such a frequency, then yes it will work fine. The question is, can you actually and accurately build it that small?

-Alex
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Old Jul 10, 2012, 05:57 PM
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Originally Posted by IBCrazy View Post
If you can build it at such a frequency, then yes it will work fine. The question is, can you actually and accurately build it that small?

-Alex
can you tell me what the measurements are, so i can try to build it.
thanks!
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Old Jul 10, 2012, 08:44 PM
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Canada, ON, Milton
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Originally Posted by mandis View Post
can you tell me what the measurements are, so i can try to build it.
thanks!
Well for 5840mhz 1/4 wave is 1.2cm and distance from reflector is 6mm.
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Old Jul 10, 2012, 09:41 PM
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Well for 5840mhz 1/4 wave is 1.2cm and distance from reflector is 6mm.
thanks martin!
ok so it is12mm and 6 mm distancefrom the reflector.
what about the reflector size is it 52mm square?
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Old Jul 10, 2012, 10:48 PM
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Originally Posted by mandis View Post
thanks martin!
ok so it is12mm and 6 mm distancefrom the reflector.
what about the reflector size is it 52mm square?
That'll work, make sure your bends are tight. Nice thin guage wire. Dont use standoff's. Or just use a piece of pcb board and etch it.
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Old Jul 11, 2012, 12:58 AM
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Originally Posted by Martin Y View Post
That'll work, make sure your bends are tight. Nice thin guage wire. Dont use standoff's. Or just use a piece of pcb board and etch it.
i have a blank pcb in hand. sorry for being slow with this but i'm good with soldering and copying . maybe you have a photo so i can take a look i think it's easier for me to understand..
thanks
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Old Jul 11, 2012, 01:09 AM
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which antenna is recommended to pair with the biquad?
thanks
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Old Jul 11, 2012, 07:28 AM
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I use a Vee antenna on my airplane when I have the BiQuad on the ground.

-Alex
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Old Aug 02, 2012, 09:22 AM
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Alex, I have been reading this thread lately,

http://www.rcgroups.com/forums/showthread.php?t=1702036

I am thinking I want to build my own biquad for my Frysky tx module. Does the reverse polarity change the construction at all? Do I still connect the coax to the reflector and the cntr conductor to the element?

Thanx in advance for your help.
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Old Aug 02, 2012, 03:36 PM
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^Not at all! Just build it as outlined in this tutorial.

-Alex
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Old Aug 05, 2012, 05:17 PM
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Saw this on ebay
http://www.ebay.co.uk/itm/Biquad-ant...ht_2925wt_1398

what do you recon ??
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Old Aug 25, 2012, 10:52 AM
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Saw this on ebay
http://www.ebay.co.uk/itm/Biquad-ant...ht_2925wt_1398

what do you recon ??
The corners in that antenna aren't sharp. Does this matter? I'm thinking it does...
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Old Aug 25, 2012, 10:55 AM
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Originally Posted by IBCrazy View Post
I use a Vee antenna on my airplane when I have the BiQuad on the ground.

-Alex
How would it work with a circularly polarized cloverleaf Tx antenna? I have a matching Rx antenna I was going to use for close-in on a diversity system. Seems the "V" would be easier to mount for sure at 910mhz.
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Old Aug 25, 2012, 11:35 AM
Sorry-I am from Denmark !!
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Danmark, Lolland, Søllested
Joined Nov 2010
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Bi quad-Danish edition-Copper plate and 2mm welding steelwire. I made it for 1280 mhz.
After testing i will make a wood backplate so it can be mountet on a tripod
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Old Aug 25, 2012, 07:49 PM
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Originally Posted by mudlark View Post
Saw this on ebay
http://www.ebay.co.uk/itm/Biquad-ant...ht_2925wt_1398

what do you recon ??
I actually have one of those. Not perfect, but certainly awesome. And for that price, it's a heck of a deal!

-Alex
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