"JGBOYLES" wrote in message
...
Hi,
Since much has been made of the pros and cons of the B&W dipole or T2FD,
I
thought it would be interesting to see if other amateurs have managed to
homebrew one of these. The B&W costs $200 USD. Seems like one could make
something that has the same amount of inefficiency for a lot less dollars.
Maybe use resistance wire (nichrome?), or connect a light bulb at the
feedpoint. The Isotron has been mentioned, but it costs too much. Any
ideas?
73 Gary N4AST

Try this: a 16 Ohm resistor in series with each side of the dipole, and a
100 Ohm resistor across the feedpoint. Unless I messed up, this will give
you SWR = 2:1 for all conditions including shorted, and absent dipoles.
Tam/WB2TT

Tam/WB2TT wrote:
Try this: a 16 Ohm resistor in series with each side of the dipole, and a
100 Ohm resistor across the feedpoint. Unless I messed up, this will give
you SWR = 2:1 for all conditions including shorted, and absent dipoles.

Why stop there? A single Bird Termaline will guarantee a 1:1 SWR over a
1:100 frequency range.
--
73, Cecil http://www.qsl.net/w5dxp



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"Cecil Moore" wrote in message
...
Tam/WB2TT wrote:
Try this: a 16 Ohm resistor in series with each side of the dipole, and
a
100 Ohm resistor across the feedpoint. Unless I messed up, this will
give
you SWR = 2:1 for all conditions including shorted, and absent dipoles.

Why stop there? A single Bird Termaline will guarantee a 1:1 SWR over a
1:100 frequency range.

But mine will actually radiate. Efficiency could easily be 33% for some
dipole lengths/frequency combinations.
Tam
--
73, Cecil http://www.qsl.net/w5dxp



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"Cecil Moore" wrote in message
...
Tam/WB2TT wrote:
Try this: a 16 Ohm resistor in series with each side of the dipole, and
a
100 Ohm resistor across the feedpoint. Unless I messed up, this will
give
you SWR = 2:1 for all conditions including shorted, and absent dipoles.

Why stop there? A single Bird Termaline will guarantee a 1:1 SWR over a
1:100 frequency range.
--
73, Cecil http://www.qsl.net/w5dxp



I got a B & W Dummy Load/Wattmeter. Would that do? LOL?



Jerry





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Try this: a 16 Ohm resistor in series with each side of the dipole, and a
100 Ohm resistor across the feedpoint. Unless I messed up, this will give
you SWR = 2:1 for all conditions including shorted, and absent dipoles.

Thanks Tam, This is exactly what I was looking for. A dummy load is 0%
efficient. A B&W dipole is less than 20% on 80m and 160m. It costs a lot of
money. There are less expensive ways to achieve 20% efficiency on 160m and
80m. 0% does not radiate (dummy load), a good bad antenna in my opinion is one
that radiates, but not too much. And it can't cost too much.
73 Gary N4AST

Try this: a 16 Ohm resistor in series with each side of the dipole, and a
100 Ohm resistor across the feedpoint. Unless I messed up, this will give
you SWR = 2:1 for all conditions including shorted, and absent dipoles.
Tam/WB2TT

========================

There's no need to mess about with the antenna. Just connect a crude
attenuator at the transmitter end of the transmission line. This much
reduces the cost of the antenna. It's then just a length of wire.