[OFARC] question on coax cable

[ARS W5OMR]

Of course, different antennas represent different input impedances, and
other factors to consider are placement, height above ground, end effect,
etc...

In 33 years of hamming with my own license, being around ham radio all my
life, and with Dad being a broadcast engineer, I have found two things to
be true in wire antennas;
Bringing the ends down on a dipole into an inverted V fashion, lowers the
input impedance to somewhere really close to 52 ohms,
And if you've got room for an inverted V, you've got room for a Delta Loop.
Feed the loop wiry open wire line, and it becomes a multi-band antenna.

W5OMR

On Nov 19, 2016 1:19 PM, "Ralph" <ke5hdf at sbcglobal.net> wrote:

> i use mainly dipole antennas
>
> my understanding is that dipoles have a natural impedance near 75 ohms
>
> radios and coax for amateur radio are 50 ohm
>
> it is easy to find 75 ohm coax cable to TV
>
> is there a solid reason why we don't use a 1.5:1 transformer at the radio
> output and use 75 ohm coax??
>
> too much loss??
>
> what is the loss of 75 ohm cable at UHF and VHF frequencies?
>
> HF frequencies ??
>
>
> Ralph
>
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