BiQuad antenna question

[gary]

http://www.lazygranch.com/images/wifi/wifi_bq_1.jpg
http://www.lazygranch.com/images/wifi/wifi_bq_2.jpg

Rather than trying to stuff the pipe, I just took a N female to N female 
adapter and hacksawed off one side. Now I have the connector and pipe 
already assembled. I tinned the copper plate ahead of time so that I 
could just add a bit more solder to connect the adapter. The only 
drawback is soldering to the hacksawed off end. It is quite the heatsink.


gary wrote:
> 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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