Topband: Antenna selector - preselector - attenuator - preamplifier: A High-Level Accessory Front End for the HF Amateur Bands QEXArticle.

[Sergio Cartoceti]

Dear 160 Meters  Topband reflector friends:

Check W8JI, Tom web site with test reports on preamplifier commercial units
at: http://www.w8ji.com/pre-amplifiers.htm.

For an in-dept 11 pages article about high performance push-pull HF
preamplifier and high performance pass-band filters comparison with
practical data for amateur bands  Cauer vs. Butterworth configuration (with
a particularly good shape factor performance in low bands) get a copy of
March/April 2003 QEX magazine (ARRL), with more preamplifier performances
data and one errata corrige in the next coming May-June 2003 QEX issue,
Letter to the Editor (this Letter to the editor file is already available in
down load from my web site at
http://www.qsl.net/ik4auy/qex_march_april_03.htm, then from this page click
the green color "Errata Corrige page", then click the red color "QEX
March/April 2003 Article Errata Corrige and  preamplifier performance."
linked page.

Hope you find of some interest. Best 73.

The author:  Sergio, IK4AUY (IR4B)

One of IY4FGM Marconi Memorial Station.
Also AC7PC US license. 
MCC Marconi Contest Club member.
http://www.qsl.net/ik4auy/