The "STEPPIR has 3 active elements on each band whereas the C3E only has 2
active elements on 15 & 20 meters, with 3 elements on 10-m. So I don't see
where the SteppIR has "half the elements" nor is comparable "apples to apples"
with a C3E. I do not favor one antenna over the other... but since the
SteppIR has more active elements and since each element uses the full 16' boom
length, whereas most of the C3E elements do not use the full 18' boom length,
shouldn't one expect the SteppIR to have better gain than the C3E even if the
SteppIR elements were a fixed length and not tuneable?
73, Dick- K9OM
The three element SteppIR is a valid comparison to your C3 ...
the SteppIR has half the elements on a boom that is two feet
shorter. Yet the SteppIR outperforms the C3 in model studies
and range tests using the K7LXC/N0AX protocols.
> The SteppIR 3 element yagi vs Force 12 C-3E (74' above ground)
>
> C-3E SteppIR elev.
> Band Gain F/R Gain F/R
> 20 12.6 16 13.4 20 13 degrees
> 17 10.3 7 13.8 21 10 degrees
> 15 12.8 17 14.2 21 8 degrees
> 12 9.8 9 14.8 14.5 7 degrees
> 10 13.2 21 15.2 11 7 degrees
> 6 n/a 16.0 20 4 degrees
>
> The C-3E numbers are Force-12 published specifications and
> confirmed by modeling with AO. The SteppIR numbers are from
> modeling in AO/YO (6 meter values use the optional passive
> elements).
73,
... Joe, K4IK
_______________________________________________
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless
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questions and ask for Sherman, W2FLA.
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_______________________________________________
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather
Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions
and ask for Sherman, W2FLA.
_______________________________________________
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