[Elecraft] OT: B & W antenna

[John Kramer]

I would not touch any antenna that uses a resistor. That is what a dummy load is
after all - great SWR but the losses are huge.

I built a T2FD when I was newly licensed back in 1984 (when I didn’t know any better),
from an article in Practical Wireless. I used the specified resistor and built it according to spec,
and put it on top of a 220 ft  building, raised 20 ft above the building. Any antenna
should have worked really well at this height being totally up in the clear. The SWR
was great across all the bands, but I was very disappointed in it’s performance. 
I have learnt a lot since then…

BTW nothing wrong with OCFD antennas, they work well on their harmonic 
frequencies as a multi band antenna, provided they are installed properly, and a good CMC is used in the
feedline. No, not an ugly Balun which might give you 1000 - 1500 ohms choking impedance
if you’re lucky, but a proper CMC with more than 12 000 ohms choking impedance.

I would rather hang a good OCFD with a quality 4:1 Balun at the feed point, and a 
quality CMC choke for 80 - 10 just before the coax enters the house, rather than fiddle with
8 dipoles yuck…

Better yet, would be to use an EFHW 80-10 1K built by www.myantennas.com

73

John, ZS5J





On 10 Dec 2015, at 3:41 PM, Joe Subich, W4TV <lists at subich.com> wrote:


> I have heard several stories about what it has for a resistor on it,
> if anyone knows for sure, I would be most interested.

https://en.wikipedia.org/wiki/T2FD_antenna

73,

 ... Joe, W4TV


On 12/10/2015 1:20 AM, David Cole wrote:
> The BED-90 works fairly well on 75 Meters, about 2 S units down from a
> dipole, but it has a 1:1 on almost any frequency between 3 MHz., and 30
> Mhz., which is fine for me as I am using a KW for MARS work, and we are
> on clear frequencies...
> 
> I have heard several stories about what it has for a resistor on it, if
> anyone knows for sure, I would be most interested.
> 
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