High voltages and circulating currents aren't a problem if the parts are
big enough. They are a problem in a compact or budget tuner.
73, Jerry, K0CQ
On 2/18/2011 12:16 PM, Steve Hunt wrote:
What Rick said, plus: there was a higher power version produced - the KW109.
This quote from G3RZP on another forum:
"The KW109 design is not well suited for really high power - say above
500 or 600 watts. All the Z match type tuners have the problem that the
working Q is totally uncontrolled, so some antennas can lead to very
high voltages and circulating currents. This is why the KW109 was
produced - an uprated KW107/ KW E-ZEE match. These couldn't the handle
the KW1000 linear amplifier output into many loads - the KW1000 has a
pair of 572B with 2400 or so on the anodes. Even the KW109 had problems
when paired with a KW1000 and some antennas.
I was development engineer at KW back in the 1970s, so I learnt some of
the weaknesses in the products."
But, if you don't exceed its capabilities and you can live with swapping
the ladderline between the two sets of terminals, it's OK.
Steve G3TXQ
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