[TowerTalk] SteppIir vs C31XR

[Peter Voelpel]

I wonder how it can correlate when the receiving dipole is not receiving the
main lobe?
Even with a position of the receiving antenna 200m above my transmit antenna
and 2km away (5,7°) I´m not able to measure beam gain compared to a dipole.
So how is that possible on flat terrain?

73
Peter 


-----Original Message-----
From: towertalk-bounces at contesting.com
[mailto:towertalk-bounces at contesting.com] On Behalf Of N2TK, Tony

I've also done model comparisons of the SteppIR and Force12 antennas which
correlate well with the two sets of field test results and Force12's claimed
gain and F/B numbers  


The SteppIR 4 element yagi vs. Force 12 C-31XR at 74' above flat ground
(gain in dBi): 

                  C-31XR         SteppIR             elev.
    Band        Gain   F/R     Gain     F/R 
     20         14.0    20     15.0     20        13 degrees
     17             n/a        15.7     22        10 degrees
     15         14.3    22     16.1     22         8 degrees 
     12             n/a        16.2     22         7 degrees
     10         15.6    21     16.6     11         7 degrees 
      6             n/a        18.7     20         4 degrees