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95307-000-01 6/87
RET-041 Instructions
page 9
10) Complete and mail the supplied " NRSC Compliance Card " .
As explained in the introduction to this kit, making AM audio quality competitive with
that of FM depends on AM broadcasters demonstrating their commitment to the NRSC
standard. The NAB is tallying AM stations as they implement the standard, so that the
rate of implementation and the total number of equipped stations can be made known
to receiver manufacturers. Now that you have upgraded your equipment to the standard,
complete the job by returning the NRSC Compliance Card to the NAB.
Operating Manual Changes
Installing this retrofit kit changes or invalidates portions of the 9100 A Operating Manual.
The following changes to that manual update it to include this retrofit. To prevent future
errors, we recommend marking each page mentioned below with " See Retrofit Kit RET-041
Instructions " .
Page references are to the Third Edition of the 9100A Operating Manual;
" Addendum #1 " refers to Addendum #1 to that manual)
1) NRSC pre-emphasis is supplied by a BLUE module on Card #4 in the mono 9100A/1.
Addendum #1 provides information about these modules.
In the main body of the 9100A Operating Manual, the following pages are affected by
this change:
1- 4,
1-5
" Introduction: High-Frequency Equalizer "
3- 10
" Installation: Option 7 "
5-1, 5-2
" Operating Instructions: Where to Start "
5-4
" Operating Instructions: HF EQ "
5-7, 5-8
" Operating Instructions: On High-Frequency Equalization "
4- 7
During initial set-up, the 9100A/l ' s HF EQ control should be turned fully
clockwise. This instruction supersedes the settings shown in Fig. 4-6.
6-1
" Proof of Performance " is unaffected by this change.
D-3
Program equalizer response will be as specified in Appendix D only
if the GREEN module is installed.
We continue to supply the older RED, YELLOW, and GREEN modules mentioned in the
9100 A Operating Manual for stations particularly those outside North America) which
may prefer other HF equalization. See Addendum #1 for more information.
2) The ACC-5 Monitor Rolloff Filter supplied with 9100A/1 units was designed to com
plement the original GREEN module. The installation instructions above describe how to
apply a complementary de-emphasis for off-air monitoring of NRSC standard audio, and
explain when it might be preferable to use the optional ACC-023 Monitor Rolloff Filter
instead. See Addendum #1 for information about monitor rolloff filtering if you choose
to use one of the alternate pre-emphasis modules.)
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