BPL Measurements in the Netherlands (Vereniging voor Experimenteel Radio Onderzoek in Nederland ) (VERON)
The Radio Amateur and the Effects of the Use of the 230-Volt Power Line for Broadband Data Communications
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.
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