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crossyagi 10 elements gain...? - RF Cafe Forums

Because of the high maintenance needed to monitor and filter spammers from the RF Cafe Forums, I decided that it would be best to just archive the pages to make all the good information posted in the past available for review. It is unfortunate that the scumbags of the world ruin an otherwise useful venue for people wanting to exchanged useful ideas and views. It seems that the more formal social media like Facebook pretty much dominate this kind of venue anymore anyway, so if you would like to post something on RF Cafe's Facebook page, please do.

Below are all of the forum threads, including all the responses to the original posts.


 Post subject: crossyagi 10 elements gain...?
Posted: Fri Apr 29, 2005 9:14 pm 
 
Lieutenant

Joined: Fri Apr 29, 2005 9:10 pm
Posts: 3
Location: Jakarta, Indonesia
Anyone could tell me ? What the International standard gain for 10 elements VHF crossyagi ?

Thanks.

TonyW.


 
   
 
 Post subject: Re: crossyagi 10 elements gain...?
Posted: Fri Apr 29, 2005 9:17 pm 
 
Lieutenant

Joined: Fri Apr 29, 2005 9:10 pm
Posts: 3
Location: Jakarta, Indonesia
TonyW wrote:
Anyone could tell me ? What the International standard gain for 10 elements VHF crossyagi ?

Thanks.

TonyW.


I also forgot to add that : what is the international standard for the HPBW (half power beamwidth) ?


 
   
 
 Post subject:
Posted: Sat Apr 30, 2005 12:44 pm 
 
Lieutenant

Joined: Tue Apr 26, 2005 6:47 am
Posts: 4
Location: Singapore
Gain= >12 dBi
Frint to Back ratio => 15 dB
CPD = 18 dB
VSWR <1.5

Mounting easy interchangeable from V to H and vice versa


 
   
 
 Post subject: Crossed Yagi's
Posted: Wed May 04, 2005 3:08 pm 
Hello Tony:

There is no "Standard Gain" for a 10 element Yagi.
The gain of a Yagi depends on it's impedance, design bandwidth,
and construction.

If the antenna is well built and well designed, the gain
will be about 12 dBd.

Build as a cross Yagi, and a 90 deg phase harnass, then
the antenna will have about 12 dBdc or 12 dB Circular Polarized gain.

Mounting a Cross Yagi is also difficult.
A metal cross boom can detune the Yagi Elements.

It is best if the antenna is end mounted.
But with VHF Cross Yagi's you can use a metal mast if
the antenna is mounted X fashion, and the mounting boom
is vertical or horizontal.

Good luck Kent WA5VJB@FLASH.NET


 
  
 
 Post subject: Crossed Yagi's
Posted: Wed May 04, 2005 3:11 pm 
Half Power Beamwidth will be about 45 degrees.



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