[Antennas] B&W AC 1.8-30 vs BWD terminated antennas?

Sun Sep 5 14:52:37 EDT 2004

 Though I agree that the B&W and similar designs are not very efficient
radiator below 10 MHz , to say that all antennas that have a Resitor at the
end of them are poor radiators is not a good statement.. for Example if you
ever used a terminated rhombic or Vee beam you would know that they are very
good antennas. and they are terminated with resistors.. some terminated long
wires are also very good antennas.. Food for thought.
73 :) Dave kc1di 

-------Original Message-------

From: Chris Boone
Date: 09/05/04 14:44:30
To: 'J. Coote'; antennas at mailman.qth.net
Subject: RE: [Antennas] B&W AC 1.8-30 vs BWD terminated antennas?

The center end load of the BWD antenna is a 800-900 ohm non inductive
resistor! The B&W has been shown to be as much as 10 db lower in signal
strength (both TX and RX!) compared to a normal dipole on freqs below
10MHz..
NOT just a few to be sure :)
Not sure of the AC antenna but any antenna that used a resistor at the
end is NOT a very good radiator (Beverage antennas are hence used for
rcv only)...

Chris
WB5ITT

> -----Original Message-----
> From: antennas-bounces at mailman.qth.net
> [mailto:antennas-bounces at mailman.qth.net] On Behalf Of J. Coote
> Sent: Saturday, September 04, 2004 7:37 PM
> To: antennas at mailman.qth.net
> Subject: [Antennas] B&W AC 1.8-30 vs BWD terminated antennas?
>>> Has anyone run an efficiency comparison between the Barker
> and Williamson BWD ninety-foot terminated folded dipole or
> "T2FD" antenna, versus their similar AC 1.8-30 terminated end-fed vee?
>> A few thoughts:
> I am guessing that the vee encloses more space and could be
> more efficient in that regard. Both antennas use similar
> baluns and load resistors. Both are loops if you consider the
> counterpoise wire in the AC 1.8-30 going from one leg of the
> balun to one leg of the resistor.
>> I'm aware that these antennas are a few DB less efficient in
> the 2 and 4 MHz bands than a resonant wire- but my
> application is instant frequency change, NVIS and not QRP or DX.
>> Thanks,
> Jay
> AAR9QM/W6CJ
>>>> - - -
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- - -

Your moderator for this list is:
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