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1994-11-20
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SB QST @ ARL $ARLB026
ARLB026 Phone interference survey
ZCZC AG90
QST de W1AW
ARRL Bulletin 26 ARLB026
>From ARRL Headquarters
Newington CT March 14, 1994
To all radio amateurs
SB QST ARL ARLB026
ARLB026 Phone interference survey
'Phone interference survey
The FCC has released the results of a telephone interference survey
just completed. 35 FCC field offices each picked three random cases
of telephone interference on record and then visited the scene. The
transmitting stations included 47 Citizens Band; 27 Amateur; 23 AM
broadcast; 10 FM broadcast; and one international broadcast station.
At the location experiencing interference, the FCC's Field
Operations Bureau personnel would first test the telephones on site,
and then test their own ''bulletproof'' telephones, as well as several
commercially available filters. 241 different telephones were
tested.
Among the FCC's conclusions was that transmitter power did not seem
to be a significant factor; they said that 10 watts or less caused
telephone interference in one-third of the cases.
The FCC also said that filters worked only one-third of the time.
''Manufacturers can design telephones to be interference free,'' the
Commission said, citing its bulletproof telephones, which were
immune from interference ''virtually all of the time.''
The FCC said that it hopes that the survey will encourage affected
parties ''to productively address and resolve this problem.''
If you would like a copy of the survey, which includes a list of
telephone models checked, send an SASE with two units of first class
postage to the Technical Information Service at ARRL HQ.
NNNN
/EX