[DX] dipole vs horiz. loop for low band DXing
Don Gaikins
[email protected]
2002年11月04日 18:30:09 -0600
Or better yet build a vertical delta loop for about 5ドル US. See Low Band
Dxing by ON5UN.
Don
W0VM
[email protected] wrote:
> ANY horizontally polarized antenna at 1/4 Wavelength (WL)
> or less in height will radiate primarily straight UP.
>> If you cannot place a horizontally polarized antenna
> for 40M at least 50 ft high, you would be better off
> with a GOOD VERTICAL antenna which also requires
> at least 30 radials, preferably 1/4 WL long.
>> See any good Antenna Book such as the ARRL
> Antenna Handbook for ground reflection coefficents
> vs height and plots of horizontally polarized antenna
> patterns in the vertical plane.
>> I like the MFJ 1792 80 / 40 vertical which is full size
> on 40M with a TOP isolating / loading coil and top hat
> for 80M. It is reasonably priced around 160ドル.
>> BASE Loaded verticals (HF2V, HF6V) etc
> have the LEAST efficient loading for 80M.
>> Tom N4KG (RF Engineer, DXer, Contester)
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