[TowerTalk] F12 Delta 240 performance observation
SPWoo
jj_2_woo at yahoo.com
Wed Sep 19 02:24:06 EDT 2012
Hi All,
I have a D240 and I haven't
used it much since I put it up this past spring. Tonight I decided to
run some performance tests. I found a DX station and I turned the attenuator on such that that my S-meter was reading S9 when the beam is pointed at him. When I turned the beam 90 degrees away I saw an S7 which is 12 db less than the maximum signal strength. When the beam was turned 180 degrees away I saw an S9 which is the same signal strength
as when the beam was pointed directly at him. I'm a little confused about this. This is
supposed to be a yagi and not a rotary dipole! The listed spec. for F/B ratio is 20db at its peak. I do know that F/B is not constant across the band for a yagi. What kind of front to
back and side rejection ratios should I expect to see on this particular antenna? I haven't asked Mark at F12 about this. I don't want to waste his time until I have more info. Perhaps I'm missing something on the test or that I made an error in my antenna assembly. Your help on this is greatly appreciated. 73.
Jonathan Woo W6GX
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