[TenTec] KW 107 Supermatch

[Dr. Gerald N. Johnson]

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
>
>
>