BiQuad antenna question

[gary]

I suppose you can use the coax right into the "pipe", but probably not 
the 1/2inch copper as the coax would be to skinny.

Personally, I really don't like having coax into the antenna. I'm used 
to an antenna being something with a connector on it, not a wire hanging 
off it. The nice thing about N connectors is you can readily make RG8 
cables. Any other connector in my opinion requires much more skill to 
make the cable. Note that SMA cables are often found surplus.

Why not get a pigtail with your RSMA (what I assume your router uses) to 
a N male connector?

I'm scanning film at the moment, and will get around to my biquad tonight.


Rastislav Galia wrote:
> gary  wrote / napísal(a):
>> It would help to have the link to the antenna design.
>>
>> I'm going to upload a photo tonight of a biquad I built that is a bit 
>> easier to build than most of the designs on the net. Basically, all I 
>> did was use round loop at 3x the wavelength rather than squares that are 
>> a wavelength on each side.
>>
>> IMHO, you need to build these antennas using a connector on the back, 
>> not coax. This is because you need a rigid "pipe" on the antenna to feed 
>> the loops.
>>
>> This is the "proper" biquad design in that is uses a coax feed to the loop:
>> http://martybugs.net/wireless/biquad/
>> Mine is similar except I use a N female to N female adapter with one of 
>> the N connectors hacksawed off as the basic feed. This bypasses the 
>> copper pipe deal. And as I stated earlier, it uses loops instead of squares.
>>   
> 
> Hi Gary
> 
> thank you for your answer. Yes, martybugs' desing was the one I was 
> refering to. My idea is to use coax like 2 meters long, insert it into 
> martybugs' copper pipe concept. That would make it as rigid as 
> martybugs' 40 centimeter long coax terminated by N connector. As far as 
> I understood you, your "rigid pipe" concerns were of mechanical 
> durability nature, whereas my question was rather about highfrequency 
> impedantial properties of N connector. In the other words, is it 
> neccessary to use N connector under the assumption that I would make my 
> long coax rigidly fixed (for example using the copper pipe) ?
> 
> -Rasto
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