[Elecraft] Amplifier thoughts

[Rick WA6NHC]

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:elecraft-bounces at mailman.qth.net] On Behalf Of brian
> Sent: Tuesday, March 28, 2017 4:31 PM
> To: elecraft at mailman.qth.net
> 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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