[TowerTalk] Cage dipole gain figures

jimlux jimlux at earthlink.net
Sun Apr 19 11:30:03 PDT 2009


john at kk9a.com wrote:
> If you use a good feedline, there is little loss from higher SWR at the band 
> edges.  For example if you use 100 feet of Belden RG-213 at 3.8 Mhz and the 
> antenna has a whopping  4:1 SWR ratio, the additional coax loss is less than 
> 0.4dB.  Of course having an antenna with a low SWR across the band, like the 
> 80m cage dipole, will make your radio happy.  There are also other methods 
> of making the SWR appear lower with a conventional dipole by adding 1/4 wl 
> of 75 ohm coax at a specific location in your feedline.
> 
> John KK9A
> 

More likely, the mismatch screws up the power meter readings used to 
make the antenna gain measurements.


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