PICO MACOM, INC.
12500 Foothill Blvd. • Lakeview Terrace, CA 91342 • (818) 897-0028 • (800) 421-6511 • FAX (818) 834-7197
Installation Procedures
5
I
N S TA L L AT I O N
Adherence to these precautions will help prevent problems
during initial installation of the PM45.
1.
Connect the I.F. jumper from the I.F. output to
the I.F. input on the rear panel.
2.
Connect the
PM45
to a 120 VAC, 60 Hz grounded
receptacle. Observe the red LED is lit, indicating
power is on.
3.
Using a signal level meter or spectrum analyzer,
set the output level.
4.
Check the aural carrier level. It should be set at
15 dBmv below the video carrier.
.
WARNING:
When connecting the
PM45
directly
to a TV set, attenuate the output sufficiently to
provide a 10dBmV RF level to the TV.
5.
Connect a 1.0 volt peak-to-peak video source
to the "Video In" on rear panel. Connect the
PM45
to a TV set, and compare the contrast
and brightness to a known signal (use off-
air signal to insure a proper modulation
level). If necessary, adjust the video
modulation until proper contrast is observed.
6.
Connect an audio source to the "Audio In" on rear
of the
PM45
. Set audio modulation (deviation) to
25 kHz with the audio modulation adjustment. A
known off-air sig-nal and a TV may be used to set
adjustment for equal audio level. See page 14 for
additional information.
7.
Connect the
PM45's
output to a proper combining
network.
T
he Federal Communications Commission
(U.S.A.) requires that cable system modulators
which operate in the aircraft communications
and navigation bands be offset in frequency by
12.5 kHz. The
PM45
PLL oscillator is factory
set to comply with FCC requirements for
frequency accuracy (+/- 5 kHz) in the
aeronautical communication and navigation
bands. The procedure for measuring the
frequency is provided later in the manual.
FREQUENCY OFFSETS - FCC (U.S.A.)
FREQUENCY
CHANNEL
NUMBER
OFFSET
108 to 118 MHz ....................................... A,B,C ..................... 14,15,16 .............. 12.5 kHz
118 to 137 MHz ....................................... A-1, A-2 ................ 99,98 .................... 25 kHz
225 to 328.6 MHz .................................... K - DD .................. 24-40 .................... 12.5 kHz
328.6 to 225.4 MHz .................................. FF .......................... 42 ........................ 25 k Hz
335.4 to 400 MHz ..................................... GG- QQ ............... 43-53 .................... 12.5 kHz
Harmonically Related Coherent (HRC) video
carriers and Incrementally Related Coherent (IRC)
video carriers are CATV channel assignment meth-
ods to reduce the effect of beat products. The
technique is used in expensive phase-locked
headends where all units are tied to a master 6.0003
MHz oscillator with a maximum error of 1 Hz. ThE
PM45
can duplicate HRC and IRC operation but it
cannot be phase locked. Only the above frequencies
are FCC approved.
