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Jun 25, 2012, 12:24 PM
100mph club member
turbodriven's Avatar
Thanks IB

When you say "with a 20 degree tilt", you mean that the square shape of the antenna does not sit level with the ground? That each tilts (I assume the left antenna would tilt left and the right would tilt right?) 20 degrees offset from the ground itself?

And 45 degrees up seems like a lot. At a 50 degree beam that would leave approx. 20 degrees of uncovered area near the ground. No low level flying allowed there? Perhaps that's a unique condition of your environment?
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Jun 25, 2012, 01:14 PM
Engineer for Christ
IBCrazy's Avatar
I mean I aim it up 20 degrees and the antennas are 45 degrees offset from eachother.

Remember the 55 degree beam is the -3db point. At that edge you still have +8db!

-Alex
Jun 25, 2012, 01:51 PM
100mph club member
turbodriven's Avatar
That makes sense. Thanks, I'm going to start building the tripod mount tonight.
Jun 29, 2012, 10:20 AM
100mph club member
turbodriven's Avatar
Complete. Almost. I still want to find/build a dome/box to protect each biquad array. As long as I'm careful though they are pretty stiff as is and the spacing from the reflector is consistent. I may add some bracing for added insurance if nothing else.

Galvanized 26ga sheet metal from Lowes
12ga solid copper core wire from Lowes (a bit thick but I wanted it stiff)
Steel compression pins for the standoffs from Lowes (only thing I could find that fit the RG58 cable snug and was solderable)
RG58 SMA cables from Ebay.
And a bit of plywood I had laying around the shop

We'll see how she works this weekend. Although I'll still be limited to only about 2 miles by my radio.
Jun 29, 2012, 12:53 PM
Engineer for Christ
IBCrazy's Avatar
^That must be one mighty strong tripod! Nice job on the diversity BiQuads, though. That was one of my favorite setups.

-Alex
Jun 29, 2012, 02:11 PM
100mph club member
turbodriven's Avatar
The whole antenna "array" weighs about 5lbs. I could probably shave another 1lb off if I drilled a bunch more holes in all the wood but the tripod seems to hold it without much effort as is. And I don't plan on hiking into any remote locations with it so meh... it'll do for now.

I'm excited to see it perform!
Jul 01, 2012, 08:30 AM
Registered User
how do you straighten the mig wire come out of roll?
Jul 02, 2012, 08:06 AM
Engineer for Christ
IBCrazy's Avatar
I use a series or rollers that straighten it via a variable tensioner wheel.

-Alex
Jul 02, 2012, 10:48 AM
100mph club member
turbodriven's Avatar
The easy way is to put one end of the wire in a vise, and the other in the chuck of a drill. Pull it tight and then drill away. As the wires spins it straightens it out. It's actually a pretty cool trick.
Jul 03, 2012, 08:29 AM
Engineer for Christ
IBCrazy's Avatar
^ I will pass that on to my machinist. He will be very interested in that technique.

Thanks,

-Alex
Jul 03, 2012, 09:06 AM
Registered User
Hugeone's Avatar
Quote:
Originally Posted by turbodriven View Post
The easy way is to put one end of the wire in a vise, and the other in the chuck of a drill. Pull it tight and then drill away. As the wires spins it straightens it out. It's actually a pretty cool trick.

I tried it with MIG wire, doesn't work. It do well with copper wire, but with MIG it just go worse.

-Hugo
Jul 07, 2012, 11:16 AM
The squidman
Do you recommend different wire size for different frequency, i will be on 2510 . Should i use still use 14 AWG?
Jul 09, 2012, 08:28 AM
Engineer for Christ
IBCrazy's Avatar
14 or 16 AWG works for 2510. My personal 2450MHz BiQuad is 14 AWG wire.

-Alex
Jul 09, 2012, 07:36 PM
Registered User
hi Alex!
will this biquad works on 5.8?
i searched but not much info..
thanks in advance
mandis
Jul 09, 2012, 07:38 PM
Registered User
Hi IBCrazy

I would like thank you for the biquad project.

This is mine and works perfect:





regards

Olympio from Brasil


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