Welcome in the World of QRP and Homebrew HAM Radio of Peter, DL2FI and Nikolai, DL7NIK
QRP Made in Germany and more
Home Impressum Kit Index QRP Shop
Back one page New Toys Contact Support Contact Office

QRP PlugNPlay Blun 4:1

This Balun was designed for all small QRP Automatic ATU like the Elecraft K2/K1 and T1 Tuner to make them work with twin lead feeders.

The BalUns are of the low loss Guanella Type, wound on two Amidon FT82 torroids. The design is based on publications of Maxwell, Sevick and W1CQ (published in the famous QRP Magazin QRP Homebrewer  einen

Click the pictures to enlarge them!

4:1 BalUn , 50 OHM primary, 200 Ohm secondary. Plot of VSWR better 1.1 between 1,0 and 30 MHz
The Balun in its enclosure.
The Balun at an Elecraft K2.

Copyright © 2003,2004,2005, 2006, 2007 QRPproject.
All Rights reserved
Webmaster and QRPproject Support
This homepage is owned by:
QRPproject Hildegard Zenker QRP and Homebrew International

Molchstr. 15
12524 Berlin
Tel: +49(30)85961323
Fax: +49(30)85961324
Contact email

Bank: Berliner Sparkasse   BLZ 10050000 Konto 1120048733
VAT- ID according to German Law §27 a Umsatzsteuergesetz :DE813395325

IBAN Number: DE83100500001120048733


Responsible according to German Law § 6 MDStV: Peter Zenker, Molchstr. 15 12524 Berlin

Amateur Radio against Racism

Nazi leave Internet