ARRL Radio Designer is an obsolete software program for circuit modeling sold between 1994 and 2000.  We were forced to discontinue it, as the new owners of the company that produced it declined to recompile it for new operating systems.  While it runs fine on Windows 3.1 and 95, it should not be expected to be compatible with Windows Millenium edition.  For about 10 years, they provided a rather functional student demo version for hams for free.  But, they have recently switched to low cost site licenses of their full featured software to institutions, so demo versions are no longer available.  Thus, hams may wish to run this old software on legacy hardware.

This archive of resources is intended to help  hams running ARD on older machines--Microsoft has discontinued support for 16 bit software on all their 64 bit products--ARRL Radio Designer will not run under x64 XP, x64 Vista, or x64 Windows 7.

• ARRL Radio Designer News and Articles
• ARRL Radio Designer Tips

"ARRL Radio Designer and the Circles Utility," by William E. Sabin, WØIYH, QEX, Sep/Oct and Nov/Dec 1998.

"Broadband HF Antenna Matching with ARRL Radio Designer," by William Sabin, WØIYH, QST, August 1995.

"Designing Low-Phase-Noise Oscillators," by Dr. Ulrich L. Rohde, KA2WEU, QEX, October 1994.  

exrf9501.txt  Support file for January 1995 Exploring RF.
exrf9503.txt  Support file for March 1995 Exploring RF.
exrf9507.ckt  Circuit file for July 1995 Exploring RF.
exrf9507.zip  Zipped circuit and report files for July 1995 Exploring RF.
exrf9509.ckt  Circuit file for September 1995 Exploring RF.
exrf9509.zip  Zipped circuit and report files for September 1995 Exploring RF.
exrf9511.zip  Zipped circuit and report files for November 1995 Exploring RF.
exrf9601.zip  Zipped circuit and report files for January 1996 Exploring RF.
exrf9603.zip  Zipped circuit and report files for March 1996 Exploring RF.
exrf9605.zip  Zipped circuit and report files for May 1996 Exploring RF.
exrf9607.zip  Zipped circuit and report files for July 1996 Exploring RF.
exrf9609.zip  Zipped circuit and report files for September 1996 Exploring RF.