[Antennas] Fw: Appropos the care and feeding of GP'S

[Henry Mei'l's]

>I suppose a 2:1 balun between an 72 ohm line and a GP would be less 
>cumbersome than two parallel
> 72 ohm lines, though 2 cables/lines would also reduce RF loss.
> Is it all possible to design baluns with fractional ratios, e.g. 1.5:1 for 
> 35 to 50 ohm matches?
> I don't mean RF transformers/tapped inductors, here: they would have 
> narrow/single-band  frequency applicability.
> Unless, of course, you have a monoband GP; that could also be done with a 
> capacitive divider.
>
> Henry oz3o n2nr
>
>
> ----- Original Message ----- 
> > I experienced that immediately after (April!) rains showers,  I could 
> > work Florida and other Southern states on 40 meters AM from NYC, in mid 
> > afternoon, running about 70 Watts -- the antenna was a 1/4 vertical 
> > using a wire mesh fence as ground counterpoise.
>> I could not do this in dry weather. Sunspot activity was also very 
>> favorable in the late 50's.
>>
>> Since the theoretical impedance of an ideal GP is 35 ohms, what about 
>> using two parallel 70 ohm
>> cables? But I suppose 50 ohms approaches the actual impedance of 
>> non-ideal GP's. By adjusting the angle of the radials
>> with respect to the horizontal, 50 ohms can be achieved, assuming your 
>> feed point height and physical environment makes this a practical 
>> possibility --  not often the case on the lower bands.
>>
>> Henry oz3o n2nr
>