Or in my case, the use of ladder line (durned HOA infested area) to
handle the near 20:1 on 160M (better on most other bands) so that the
loss is from the tuner to the antenna, not the final.
My solution is that I'm moving to a location better suited for antennas,
far far away in a land called Idaho. ;-)
Rick wa6nhc
On 3/29/2017 11:47 AM, Ron D'Eau Claire wrote:
An SWR approaching 10:1 means high RF voltages on a coaxial line at the voltage
loops and high current flows at the current loops requiring a very heavy-duty
transmission line - likely a nitrogen-filled hard line at 1.5 kW or, at the
very least, a very heavy Teflon insulated line. In practice, it is usually the
voltage breakdown that kills coax.
Of course high SWR also means high losses between the amp and the antenna.
The power ratings published by coax cable suppliers are based on a low SWR --
typically less than 1.5:1.
The bottom line is that going QRO means a more careful design and installation
of the entire antenna system.
73, Ron AC7AC
-----Original Message-----
From: Elecraft [mailto:[email protected]] On Behalf Of brian
Sent: Tuesday, March 28, 2017 4:31 PM
To: [email protected]
Subject: Re: [Elecraft] Amplifier thoughts
KAT500 handles a much wider SWR range (like to about 10:1).
Why do you assume people are lucky enough to have antennas with no more than a
3:1 SWR across the ham bands?
Yes, higher SWR's require beefed up components but welcome to the real world.
73 de Brian/K3KO
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