[Elecraft] 6 meter beam - OT

[Lance Collister, W7GJ]

Hello Gary,

Just be careful comparing information you receive from different sources!  That is 
why we put together the VE7BQH comparison table, with all antennas listed in FREE 
SPACE GAIN COMPARED TO A DIPOLE (DBD).  Gain figures look unbelievably good when an 
antenna gain in dBi is compared to a conservative dBD value.  Many antenna 
performance calculating programs also include up to 6 dB of extra gain for the peak 
GROUND GAIN LOBE when the antenna is aimed on the horizon over flat perfectly 
conducting ground.  Be sure you compare apples to apples or you will be very 
disappointed in whatever antenna you build.  Good luck and VY 73, Lance

On 3/18/2010 5:03 PM, Lew Phelps K6LMP wrote:
>
> For a Yagi to achieve gain similar to a three-element quad, you need to double the
> boom length.  If you look at the marvelous spreadsheet that VE7BQH posted a bit
> earlier, you'll see that single Yagis of about the same boom length as the
> three-element quad offer free space gain of only about 5.5 to 6.5 dB, and Yagis
> with about 9.5dB have boom lengths of roughly 1.1 wavelengths, more thn twice as
> long as needed for a comparable gain quad.

-- 
Lance Collister, W7GJ (ex: WN3GPL, WA3GPL, WA1JXN, WA1JXN/C6A, ZF2OC/ZF8, E51SIX)
P.O. Box 73
Frenchtown, MT  59834  USA
QTH: DN27UB
TEL: (406) 626-5728
URL: http://www.bigskyspaces.com/w7gj
2m DXCC #11/6m DXCC #815

Interested in 6m EME?  Ask me about subscribing to the MAGIC BAND EME email reflector!