[TenTec] Antenna Tuner

[Marinus Loewensteijn]

> > On Thu, 1 May 2008 23:40:37 +0000, Marinus Loewensteijn wrote:> > >A balanced feed will always have the lowest losses, regardless what > >antenna you hang at the end. You can even hang a vertical at the > >end through a wideband balun. > > Not necessarily. There's some excellent work reported in one of the > ARRL Antenna Compendiums showing that window line is quite lossy > when it's wet. 
That's where TwinCom comes into its own. 
 
Baluns are only good if you have a matched (tuned) aerial whereas I am using something that is not matched, in other words impedances are all over the place, varying from band to band. Have yet to see a choke or balun that will handle 25 - 5000 Ohms over the HF region.
 
> I suggest that you (and anyone else who thinks a balanced feedline > makes a balanced antenna study my RFI tutorial and the associated > Power Point on Coax Chokes. > > http://audiosystemsgroup.com/publish > > ANY antenna without a REALLY GOOD common mode choke at the feedpoint > can be quite noisy on receive. It's not very practical to put ANY > common mode choke on a balanced feedline, let alone a REALLY GOOD > one. > > 73,> > Jim Brown K9YC> > 
 
Many thanks for your input
73, Marinus, ZL2ML
_________________________________________________________________
Discover the new Windows Vista
http://search.msn.com/results.aspx?q=windows+vista&mkt=en-US&form=QBRE