RadioBanter - View Single Post

February 16th 04, 01:01 AM

oUsama (Yuri Blanarovich) wrote in message ...

If you want maximum gain on one frequency, or sub-band, then I agree
that a Long John tuned to your favorite frequency is the way to go. But,
if you want good to very good performance across the whole HF spectrum
from 13.5 to 33 MHz, or higher, in ONE antenna then the ONLY choice,
IMO, is a LPDA.

There is a solid reason why the governments of the world use LPDAs for
State Department, FAA and Defense HF communications.

Aaaah, not so fast.
Have you checked StepIR tunable antennas with monobander performance on any
frequency within that band? Plus instant pattern flip and much less cumbersome
than LP. Read comments from users. This antenna is making LPs obsolete (unless
you need spread spectrum instant coverage)

Yuri, K3BU.

Yuri,
I find your comment very interesting. I was totally unaware that the
IR
antenna had laterally moveable elements so it can compete with
monobanders.
Can you point me to a URL that shows how the elements are moved along
the boom?
I suspect that such a design would provide spread spectrum coverage
since it would be resonant on all frequencies.

Regards
Art