[TenTec] 229 A Antenna Tuner

[rick@dj0ip.de]

It was WORTHLESS.  Don't use it.
I always used external baluns with my various Ten-Tec tuners.

You should use a 1:1 Guanella balun and don't let anyone tell you any
different.
The 4:1 many people recommend has just a fraction of the common mode
impedance of the 1:1.

The matching range of the 229 or 238 is wide enough and doesn't require a
4:1 to help with impedance matching.  

Also, depending on the antenna, if it happens to be a low impedance anyway,
and you use a 4:1, you make the situation (for the matchbox) 4x worse,
potentially placing the impedance lower than the matchbox can match.  Most
matchboxes have their highest loss at very low impedances (under 20 Ohms) so
you don't want to artificially transform a higher impedance down lower than
20 Ohms.

If you want to read a bit more detail on this, you can read what W8JI and
G3TXQ and VK1OD have written on this.  I have links at the bottom of the
page on my web page:
http://www.dj0ip.de/balun-stuff/tuner-baluns/ 

For cheaper matchboxes with smaller impedance matching range, sometimes you
do need a 4:1 transformer but that should be in addition to the 1:1 Guanella
balun, not instead of.  In this case the 4:1 may be a voltage balun.  Its
only job is the impedance transformation.  The Guanella takes care of
blocking the common mode current.

73 - Rick, DJ0IP
(Nr. Frankfurt, Germany)



-----Original Message-----
From: TenTec [mailto:tentec-bounces at contesting.com] On Behalf Of Edward
McCann via TenTec
Sent: Wednesday, November 30, 2016 8:42 PM
To: tentec at contesting.com
Cc: Edward McCann; edward mccann
Subject: [TenTec] 229 A Antenna Tuner

Can any members of the group comment as to the nature of Balun in the 229A?

Was it a Voltage Balun as was the early craze, or current and suitable for
decent CMC suppression?

Thank you,

Ed McCann
AG6CX

Sent from my iPhone

Sent from my iPhone
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