 |
ARRL Products:
VHF/UHF/Microwave(More)
International Microwave Handbook -- Coming Soon!
-- Reference information and designs for the microwave experimenter. Published by RSGB and ARRL.
VHF/UHF Handbook--Second Edition -- THE guide to theory and practice in the VHF and UHF bands
Microwave Update 2003 -- 18th Annual Microwave Update 2003. September 25-28, 2003. Everett (Seattle), WA.
Microwave Projects -- Complete designs and ideas for the microwave experimenter: signal sources, transverters, power amplifiers, test equipment and more.
TravelPlus CD-ROM -- Locate repeaters along your travel route. Detailed maps and current repeater data.
|
|
|
Feedback - October, 2003 QST
In "The Doctor is IN" (Aug 2003, p 53), we
should have pointed out that the formula for the LC constant should be used
with L in µH and C in µF (not H and F) in addition to f in MHz.--tnx Robert
Crupi, NA6H
In "Hands-On Radio" (Mar 2003, p 64), the
first sentence of the caption for Figure 1 should read "The common collector
circuit," not "...common emitter..." It is, of course, an emitter-follower circuit
and we labeled it incorrectly.--tnx Galen Tustison, W4WET
In "Solid-State Those Panel Lamps" (Sep 2003,
pp 38-39), we neglected to talk about reverse voltage protection for the LEDs
when operating from an ac source. The diode will be subject to about 9 V peak,
when operated from a 6.3 Vrms ac source. LEDs will normally have a
PIV rating of anywhere from 5-10 V and a back protection diode placed in series
with the LED will ensure against premature failure. Another LED, back to back,
in series with the first, will also work and both will then light on ac. Of
course, if you are running these on dc, there's no problem.--tnx Roger
Wagner, K6LMN
Page last modified: 01:18 PM, 29 Aug 2003 ET
Page author: qst@arrl.org
Copyright © 2003, American Radio Relay League, Inc. All Rights Reserved.
