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Old Oct 25, 2010, 10:02 PM
bracky72 is offline
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Questionable judgement
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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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Old Oct 25, 2010, 10:50 PM
Vantasstic is online now
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I take it the bowtie being horizontal provide the correct polarity for a vertical VTx antenna?
Old Oct 25, 2010, 11:29 PM
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Wonderful! Subscribed.
Old Oct 25, 2010, 11:33 PM
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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
Old Oct 26, 2010, 12:24 AM
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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.
Old Oct 26, 2010, 05:25 AM
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All the dimensions remain the same using the pcb, galvanized steel or other material?
Old Oct 26, 2010, 05:56 AM
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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.
Old Oct 26, 2010, 07:04 AM
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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.
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Old Oct 26, 2010, 08:05 AM
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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
Old Oct 26, 2010, 08:46 AM
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Quote:
Originally Posted by Megafluffy View Post
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
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Old Oct 26, 2010, 03:37 PM
JONBOYLEMON is online now
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This looks like a doable build for me. Thanks in advance for all your work!!!!!!!!!!
Old Oct 26, 2010, 07:52 PM
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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?
Old Oct 26, 2010, 10:18 PM
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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
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Old Oct 27, 2010, 12:42 PM
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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
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Old Oct 27, 2010, 02:13 PM
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Quote:
Originally Posted by techspy View Post
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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