DIY BiQuad 11dbi antenna tutorial! - Page 2 - RC Groups
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Oct 25, 2010, 10:02 PM
Questionable judgement
bracky72's Avatar
I have never tried building one of your antennas before but I think I will try this one for 2510 mhz. Thanks.
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Oct 25, 2010, 10:50 PM
'FPV'er...not a "LOS'er
Vantasstic's Avatar
I take it the bowtie being horizontal provide the correct polarity for a vertical VTx antenna?
Oct 25, 2010, 11:29 PM
Flying with the eagles
etman's Avatar
Wonderful! Subscribed.
Oct 25, 2010, 11:33 PM
Cape Cod
tom3holer's Avatar
IBC,

Once again you have come up with that seems to be almost too good to be true.

One question if I may slightly off the subject. I am also on 900mhz and was wondering if you have done the "SAW" mod to your receivers and was it worth it. I have the new Saw filters already. I thought I read somewhere you did it and did not think it was worth the effort.

Tom
Oct 26, 2010, 12:24 AM
Registered User
Alex, you must be a teacher, you are so patience to explain every thing and you do it well.
Thanks
I made mine PCB base and I'm using it for a while, This antenna works just fine.
https://www.rcgroups.com/forums/show....php?t=1301126
Now Im planning to make a new one and use PCB for antenna element instead of wire, I mean to print the antenna element on a piece PCB, It would be neat.
Oct 26, 2010, 05:25 AM
Registered User
All the dimensions remain the same using the pcb, galvanized steel or other material?
Oct 26, 2010, 05:56 AM
Honey Badger
Blue Chip's Avatar
If using a tracker - is there any reason to have more than one of these? Seems like this on a tracker and a di-pole for close in would do the trick.
Oct 26, 2010, 07:04 AM
Engineer for Christ
IBCrazy's Avatar
Vantasstic - Yes, the bowtie should be flat, not upright. Look at Talajouy's.

Talajouy - I wrote the tutorial because the Martybugs tutorial wasn't that easy to follow or build. Your BiQuad is a work of art! My next one will be with a steel wire.

HF ATL - Any metal will work. Dimensions remain the same.

Blue Chip - This is a great antenna to use with a tracker.
Oct 26, 2010, 08:05 AM
Registered User
Hi IBC,

I see you run the coax trough the reflector and fold back the screen and then connect it to the reflector.
On many other bi-quads I have seen that they connect the screen when it goes trough the reflector.
Have you done any simulations (or reading) on which method is best, or if it is the same?

Megafluffy
Oct 26, 2010, 08:46 AM
Engineer for Christ
IBCrazy's Avatar
Quote:
Originally Posted by Megafluffy
Hi IBC,

I see you run the coax trough the reflector and fold back the screen and then connect it to the reflector.
On many other bi-quads I have seen that they connect the screen when it goes trough the reflector.
Have you done any simulations (or reading) on which method is best, or if it is the same?

Megafluffy
Actually, it doesn't matter much, but will make some difference. So long as the shield remains around the center conductor up to the connection point with the bowtie, it really makes little difference. However, you need to keep the shield from fraying. I suggest that if you use this method you solder all the way around the edge of the shield to keep it from fraying.

I simply ran my simulations based on my design.

On the other hand, many use a small copper tube to feed the coaxial line through. I did not do this simply to cut down on the amount of material needed. I made my design as easy to do as possible with minimal parts count. Future builds will be of a more rugged design. This unit was built for this tutorial and testing.

-Alex
Oct 26, 2010, 03:37 PM
Full disclosure, not sponsored
JONBOYLEMON's Avatar
This looks like a doable build for me. Thanks in advance for all your work!!!!!!!!!!
Oct 26, 2010, 07:52 PM
Registered User
HI IBC,
already did myself a patch and many dipole following your instructions (and they are good!), now it's time for the biquad.

Is 10 AWG Iron wire any good for the bowtie?
What diameter is just righ with iron?

A piece of wood glued on the back is ok for mounting on the tripod/ tracker?
Oct 26, 2010, 10:18 PM
Engineer for Christ
IBCrazy's Avatar
10 AWG is a bit excessive for anything over 900MHz. For 900 MHz, 10 AWG is fine.

You can use anything on the backside of the reflector to mount it so long as it is an insulator. And even then, it's not that critical.

-Alex
Oct 27, 2010, 12:42 PM
Registered User
techspy's Avatar
I will be building this one soon. Couple questions... Does painting (light spray paint) have any discernible effect on performance? I am thinking flat black but would there be any benefit to a chrome/copper type paint?

Thanks
Oct 27, 2010, 02:13 PM
Engineer for Christ
IBCrazy's Avatar
Quote:
Originally Posted by techspy
I will be building this one soon. Couple questions... Does painting (light spray paint) have any discernible effect on performance? I am thinking flat black but would there be any benefit to a chrome/copper type paint?

Thanks
None what so ever


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