Re: Z range KAT2 ?

[PE1E]

Thanks Don.

I found that the my KAT2 tunes about everything ( endfed long- and
shortwires, random length wire verticals with and without radials ( 100' asl
! ) on 80-40-20-15 where my LDG 200 Pro ( automatic atu ) fails definitely.

LDG 200 claims to match ~  5-1K and in order to judge the misperformace of
my LDG200 I want to know the Z ranges on 80-4-20 of my KAT2, so that I can
claim a LDG refund or repair.

BTW, and a bit OT, I presume an external KAT 100 fits 100 W continuous.
Could the KAT100 withstand 250 W SSB( speech SSB only, no CW no FM ) , if my
sig is not rf clipped  ( my old Datongs rf clippers ....)  and my
transmissons are short ?
If so, I'll get rid of the LDG and buy me a KAT100.

Peter, PE1E


----- Original Message -----
From: "Don Wilhelm" <[hidden email]>
To: "PE1E" <[hidden email]>; <[hidden email]>
Sent: Saturday, October 28, 2006 5:02 PM
Subject: RE: [Elecraft] Z range KAT2 ?


> Peter,
>
> The Impedance range that the KAT2 will match will be greater on the higher
> bands than the lower (just because of the math in the formulas for
impedance
> of inductors and capacitors).  So I hesitate to guess at an answer becuase
> you did not specify a frequency - I can add up the inductor and capacitor
> values and give a range for each.
>
> With a bit of work with a program like TLW (www.arrl.org), one could
> determine the impedance range for each band.  It is an L network tuner
with
> a series inductor range from 0 to 20.62 uH in 0.16 uH steps; while the
shunt
> capacitor can range in value from 0 to 2423 pf in 10 to 12 pf steps.  The
> shunt capacitor can be at either end of the inductor. Only the min and max
> values need to be entered for each component and configuration, so there
> would be 8 calculations for each band of interest.
>
> All in all, it is a wide impedance range, but will be more restricted on
160

> meters than on 10 meters.  This same principle applies to all Elecraft
> tuners and to other manufacturers of similar L network designs.
>
> 73,
> Don W3FPR
>
>
> > -----Original Message-----
> >
> > Is it something like 5-1000 ?
> > Can't find no indication wherever.
> >
> > Peter, PE1E.
> >
>
>

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[Vic K2VCO]

PE1E wrote:

> I found that the my KAT2 tunes about everything ( endfed long- and
> shortwires, random length wire verticals with and without radials ( 100' asl
> ! ) on 80-40-20-15 where my LDG 200 Pro ( automatic atu ) fails definitely.
>
> LDG 200 claims to match ~  5-1K

It's not as simple as that.  The impedance may be more or less reactive,
and the reactance can be either capacitive or inductive.  I would expect
that tuners of different design might work better or worse with
particular combinations of resistance and reactance.

> BTW, and a bit OT, I presume an external KAT 100 fits 100 W continuous.
> Could the KAT100 withstand 250 W SSB( speech SSB only, no CW no FM ) , if my
> sig is not rf clipped  ( my old Datongs rf clippers ....)  and my
> transmissons are short ?
> If so, I'll get rid of the LDG and buy me a KAT100.

Keep in mind that the KAT100 requires a K2.  So if your 250 watts comes
from a QRP K2 plus amplifier, it would work.  But if you're planning to
use a different transceiver, it would not.

I believe that the KAT100 is exactly the same as the KAT2 in terms of
network values and algorithms; so if your KAT2 matches everything so
should the KAT100!
--
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco
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[Jeff-229]

Peter, PE1E, wrote:
> I found that the my KAT2 tunes about everything ( endfed long- and
> shortwires, random length wire verticals with and without radials ( 100'
asl
> ! ) on 80-40-20-15 where my LDG 200 Pro ( automatic atu ) fails
definitely...

In case anyone is considering which autotuner to buy, my results are similar
to Peter's.  My KAT2 tunes my end-fed wire to a reasonable SWR on all bands,
whereas my LDG AT-100Pro falls short on 10m, despite changes in the length
of the wire.

73 & 72,
Jeff, WB5GWB
Long Island, NY
K2 #821

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[Bill Johnson-10]

I gave up on LDG after having the Elecraft tuners. I was very disappointed.
The only non elecraft tuner I am successfully using is a remote SGC for a
ladder line fed off-center lazy L with an elevated ground plane which while
it tunes, doesn't work squat.  I am pulling that one down and going with a
much larger loop.

 
Bill
K9YEQ
 
K2-35 & 5279; KX1-35/3080
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