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The Radio
Amateur and the Effects of the Use of the 230-Volt Power Line for Broadband
Data Communications
Internet: http://www.darc.de/referate/emv/plc/VERON_PLC_Report.pdf
Summary: This 38-page technical paper starts with a
PLC tutorial, then outlines the test methods and results of PLC testing by
Dutch amateurs. At the turn of the year 2002 a series of measurements was
conducted to evaluate the risks of interference by PLC for the amateur station
PA0KDF. Both in-house and outside field strength measurements were taken and
compared with the CEPT proposed radiation limits ( NB 30, Norwegian Limit and
BBC limit). In addition the coupling between the mains wiring and the antennas
of the amateur station was determined. In an audio test, where use was made of
amateur antennas and receiver, the level of interference in the HF amateur
bands was evaluated. Only in the case of the strictest limit, the BBC limit,
adequate protection was provided against mains injected interference signals.In
addition measurements were performed to find the "normal" interference levels
on the mains wiring. Firstly it became apparent that the present interference
levels in a quiet rural area are far below the CISPR 22 limits and secondly,
injection of interference signals with a level equal to the CISPR 22 limit
level causes harmful interference to the reception of signals in the amateur
bands.
Author: Koos Fockens, PA0KDF
HF radio
reception compatibility test of an in-house PLC system using two brands of
modems.
Internet: http://www.arrl.org/tis/info/HTML/plc/files/ModemRPRTVeron11-04-03.pdf
Summary: Tests
have been performed on the EMC of two types of in-house PLC modems, developed
according the HomePlug® standard,
that recently appeared on the European market. Some measurements were done in a
laboratory set-up (mains disturbance voltage, field strength, background
noise), other were performed in the house of the author (interference on
amateur radio receiving antenna, background signals and noise on mains). One
type PLC modem seems just to meet the mains disturbance limit in EN55022 for
residential environment, the second type showed a level which was approximately
20 dB higher. Under the condition that the in-house PLC modem complies with the
current EN55022 B standard, and that the modem additionally uses notches for
the bands of the amateur services according to the Homeplug® standard,
thegeneral conclusions drawn were: Only when when a reasonable well constructed
outdoor antenna is used the interference from the modems is probably not a
threat to the radio amateur service;
Outside the notches harmful interference may be caused to the
broadcasting services; In the laboratory environment with many PCs running, as
well as in the author's home environment, the background mains disturbance
level was 30 or more dB's below the EN55022 B limit.
Author: VERON EMC Committee, Koos Fockens,
PA0KDF
Page last modified: 01:57 PM, 01 Apr 2004 ET
Page author: w1rfi@arrl.org
Copyright © 2004, American Radio Relay League, Inc. All Rights Reserved.
