Gamma match and 2 element yagi.

[zp9mce]

Greetings to all here again with my questions.
I am currently producing a 2-element yagi in my work because I do not have space for a three-element yagi.
Plans use the web of Master 19sd348 antennas.
In the manufacture of the gamma match I encounter a problem of material and I do not have all materials in the plane I asked a RG-8 coax with the shield insulating but I have only RG-213 is the same?
At the level of gamma also appears that the aluminum must be of a diameter of 9mm and mine is 1.2 mm in diameter that would also impact?
As I said it's hard to get the materials here.
The antenna is at this link. 19SD348 DX system.
Thanks for your responses.
op:

 

[Henry HPSD]

Hi there,

Change the element spacing to 1,2 meters.
The antenna will have a impedance of 28 Ohms (J0)
The antenna would be about 20..22 ohms now.

You can use your previous feeding methode again.

RG8 would equal RG213 enough for beeing used in a gamma-match.
The only worrie i have is that your aluminium is too far off
Tho to be honest..i have made quite some gamma-matches who were not fully to correct measurments...but most were usable.

You migth consider a Moxon antenna aswell. Though the 2el yagi can have a sligth higher gain as a moxon, the Moxon has a outstanding FB over a wide frequency range wich will be of more use than that sligth advantage is gain.

Regards,

Henry 19SD348

 

[zp9mce]

Hi Henry, as always helping me.
Tell you mean the system using the antenna in the 3-element yagi?
You are referring to DK7ZB system?
This is a great system, thanks for your answer, my friend.
Manuel.

 

[Henry HPSD]

Yes,

That was what i mean.

And please do not forget a Moxon or a Hexbeam...they will "outperforme" any normal 2el Yagi,
since one isnt capable of hearing a difference iin say.. 1dB in forward gain, ( that would be a plus for the normal yagi)
But one can hear the difference in FB wich is in favourble of the moxon/hexbeams.
And that truly does make a difference.

Regards,

Henry
www.19sd384.nl

 

[MrSuburban]

You dont need a gamma match direct feed the 2 element yagi

 

[CDX-007]

You don't need a Yagi, direct-feed a 2 element Quad!

The KB3TTP 10 Meter Quad - Build a Stronger 2 Element Quad Antenna

Quad Antenna Calculator

You can use ¼λ of RG-11 as a matching transformer and put the Quad in the square, it will only be 9'h x 9'w x 6' boom, IF you can get fiberglass, PVC or bamboo for spreaders.