[Elecraft] KAT100-2 Question

Sat Mar 20 23:03:01 2004

----- Original Message ----- 
From: "George, W5YR" <[email protected]>
To: "Darrell Bellerive" <[email protected]>; "Don Wilhelm" <[email protected]>;
"Elecraft Email List" <[email protected]>
Sent: Saturday, March 20, 2004 4:53 PM
Subject: Re: [Elecraft] Home made Sigma-GT5 & KRC2 or SGC?


> Darrell, consider the source of loss in a simple coil of coax - say, ten
> turns about six inches in diameter - which will do an excellent job of
> decoupling a balanced line from a run of coax.
>
> Roy Lewallen W7EL has demonstrated that a balun on the input of a tuner is
> subject to the same stresses or more that if used at the output.
>
> I use W2DU-style bead baluns of my own design which have a measured loss
of
> about 0.1 dB at 14 MHz. I have three antennas fed with ladder line. Each
> transitions to coax via a W5YR bead balun and thence to the tuners. Tuner
> loss at 14 MHz measures about 0.5 dB on average.
>
> Baluns need not be lossy unless designed that way. Same with tuners, none
of
> which have fans or ventilated cabinets for cooling.
>
> 73, George W5YR
> Fairview, TX
> [email protected]
> http://www.w5yr.com
>
>
> ----- Original Message ----- 
> From: "Darrell Bellerive" <[email protected]>
> To: "Don Wilhelm" <[email protected]>; "Elecraft Email List"
> <[email protected]>
> Sent: Saturday, March 20, 2004 6:29 PM
> Subject: Re: [Elecraft] Home made Sigma-GT5 & KRC2 or SGC?
>
>
> > I know that this has been discussed before on the mailing list, but no
> > matter how well designed a balun is, I just don't believe that it will
> > be very efficient when used with a non-resonant doublet for multiband
> > operation from 160 to 10 meters. Add a long length of coax and the
> > losses further increase. The balun must be on the transmitter side of
> > the tuner for the lowest losses, hence the need for a remote tuner, or a
> > QTH where open wire feeder can be used.
> >
> > Darrell VE7CLA K2 #1973
> >
> > On Sat, 2004-03-20 at 16:16, Don Wilhelm wrote:
> > > Folks,
> > >
> > > A balun will take care of the balanced part (although I must admit
that
> the
> > > balun impedance should be quite high with high impedance loads) - but
my
> > > request os for an Elecraft REMOTE tuner.  It would solve the multiband
> > > problem at my QTH.  I have a 150 ft. run of coax from the shack to a
> place
> > > where I can locate a tuner (XYL says no antennas or feedlines where
she
> can
> > > see them from the windows!!!)
> > >
> > > I am currently addressing the situation by building dedicated antennas
> for
> > > each band, but it certanly would be nice to have one multiband antenna
> that
> > > had an automatic tuner made by Elecraft - I know, I can buy an LDG,
but
> > > don't want to do that.
> > >
> > > 73,
> > > Don W3FPR
> > >
> >
> >
> > _______________________________________________
> > Elecraft mailing list: [email protected]
> > You must be subscribed to post to the list.
> > To subscribe or unsubscribe see: