The point is that protection is built into the tuner & the firmware to
take care of extreme instances. As I recall, one release a few years
back stated that it will handle the parting of an antenna wire while
transmitting at maximum output. We can assume that a non-resonant
antenna is not cause for concern. There's not much point in having an
ATU if it can only be used with resonant antennas.
But as someone else has mentioned-- choose an optimal "random" length so
as to get a good match on multiple bands.
73,
Drew
AF2Z
On 12/13/20 02:12, David Gilbert wrote:
Seriously?? Why do you think that Elecraft's tuners (like just about
every other one) have max power ratings that differ depending upon the
SWR? For example, for the KAT500 has a max power rating of 1000 watts
into a 3:1 SWR but only a 600 watt rating into a 10:1 SWR??? It can
match both SWRs, but not handle the same power at both.
Did you bother to check out TLW like I suggested?
Dave AB7E
On 12/12/2020 8:59 PM, Walter Underwood wrote:
Of course there are high voltages or currents in some tuning
solutions. Why do people think the Elecraft ATU would not be designed
to handle those?
wunder
K6WRU
Walter Underwood
CM87wj
http://observer.wunderwood.org/ (my blog)
On Dec 12, 2020, at 7:36 PM, David Gilbert <[email protected]> wrote:
A matched conditon does NOT prevent the components of the tuner from
seeing high voltages and/or high currents. Check out TLW ... the
transmission line application that comes free with the ARRL Antenna
Book. Pick a load that gives a high SWR and then click on the
"Tuner" button for the application to draw one of four different
tuner configurations for you. The app will tell you what the
voltages across each component are, and also the power loss (i.e.,
heating effects) in each one.
73,
Dave AB7E
On 12/12/2020 8:18 PM, Walter Underwood wrote:
Tuning happens at low power, so transients are small. After it is
matched, why would the K3 ATU not be rated for full power over the
full SWR range?
Other components might fail, of course. Amphenol UHF connectors are
only rated for 500 V.
wunder
K6WRU
Walter Underwood
CM87wj
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