[KYHAM] Advice About HF

[Bill Fuqua]

Before you get real serious about the B&W broadband dipole (T2FD) you may 
want to look at an analysis of it.
http://www.cebik.com/wire/t2fd.html

Note the losses in the load resistor at lower frequencies and at all other 
frequencies.
Generally, on the ham bands half of the power is lost in heating the 
resistor, at best, except for 10 meters.
Between most ham bands it is 3/4 lost or more. And at lower frequencies 
only 10th to 16th of the transmitter output is radiated.

This would not affect receive at all due to the high atmospheric background 
noise floor. Which increases at lower frequencies. Apparent low noise 
behavior is probably due to the antennas attenuation factors.

Now saying that, I will have to admit that it is easy to match and most 
people will not really notice the loss of 3/4 of radiated power and it's 
impedance is not affected much by nearby objects and how it is strung 
up.  Also, these losses would not be noticed at all on receive.  At all 
frequencies that it is designed for you are still atmospheric noise limited 
on receive.

73
Bill wa4lav