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Microwave Projects 2 -- More innovative projects: transverters and transmitters, preamplifiers, power amplifiers, filters, and more.

ARRL's VHF/UHF Antenna Classics -- Practical designs and construction details from the pages of QST.

International Microwave Handbook -- Out-of-stock. New Edition Coming Soon! -- Reference information and designs for the microwave experimenter. Published by RSGB and ARRL.

ARRL's VHF Digital Handbook -- Now Shipping! -- Dive into the digital radio universe!

The ARRL UHF/Microwave Projects CD -- Practical projects, design and construction ideas for UHF and Microwave Experimenters

Feedback - February, 2004 QST

Several readers commented on the Doctor's solution ["The Doctor is IN," Dec 2003, p 52] to feed a 3.2 W speaker from an 8 W source with a 250 or 500 W transformer. A better way to do this is to use a multi-tapped line to voice coil transformer as an autotransformer. Connect the 8 W secondary tap and the common across the audio output line and the 3.2 W tap and the common to the speaker. Let the primary "float" unconnected. A 70 V PA line to voice coil transformer works (RadioShack 32-1031).

The J. E. Richards Middle School ["ARRL in Action," Jan 2004, p 12] is actually located in Lawrenceville, Georgia, a suburb of Atlanta.



Page last modified: 01:01 PM, 05 Jan 2004 ET
Page author: qst@arrl.org
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