Dual CR 900 RC Serviceanleitung Seite 3

Tuning Instructions for CR 900 RC
Signal source
Equiprnent
1) FM oscillator
87.5 MHz
108 MHz
2) FM 16 input circuit
FM Signal generator
to 75 ohm
antema input
approx. 98 MHz
approx. 90 MHz
3) FM IF (fine tuning)
Antenna to 75 Ohm Receive strong
antenna nput
FM transmitter
at its nomtnal
4) Pilotfrequencies 76 kHz, Channel separation
FM Signal generator
to 75 ohm
without
antenna nput transmitters
approx. 98 MHz
key: OFF
5) Suppression of residual pilot frequencies
FM signal generator
to 75 ohm
antenna input transmitters
approx.
6) FM Search threshold
FM Signal generator Frequency with-
to 75 ohm out transmitters
antenna input
approx. 98 MHz
7) AM osci"ator
AM 522
AM 1611
8) AM input circuit
AM signal generator
to AM antenna
input 999 kHz
603 kHz
1404 kHz
9) AM Search threshold
AM signal generator
to AM 999 kHz
Signal Sourcesettng
I Shin ±
40 kHz, Mod. 1 kHz
Tune to approx.
98 MHZ
Tune to approx.
90 MHZ
Tune to approx. 98 MHz
St-ift ± 40 kHz,
Mod. 1 kHz
1—2 mV, without pilot
with 19 kHz Pilot
(19 kHz)
Tune to approx.
98 MHz, 1-2 mV
19 kHz Piot ON
98 MHz
Tune to approx. 98 MHz
Shift 40 kHz.
Bhd. 1 kHz. 10 pv
kHz
kHz
10 WV—lmU 1 kHz
Mod. 30%
999 kHz
603 kHz
1404 kHz
100 uu 1 kHz
tvlod. 30%
999 kHz
Connection of Itern to be tu-ed
measuring instrument
DC voltmeter
to TP 1 (R 402)
Harmoric detector Tl
oscilloscope
L 404
to AF output
L 405
aircoilS
DC voltmeter L 405
to TP 3-TP 4
L 405
(over R 412)
L 404
tumng
Frequency canter VR 501
toTP5
Üldge 3 J 47)
AF voltmeter,
502
to AF output
AF voltmeter, LPF (lett Channel)
to AF output
LPF (nght channel)
Check the display
VR 401
DC voltmeter L 402
to TPI (R402)
TC 402
Repeat tuning
AF voltmeter,
oscilloscope
to AF output L 403
L 401
TC 401
Check display
VR 402
3
Tuning, Rernarks
8.0 VDC ± 0.2 V
approx. 1.6 V DC
AF maxirnum
AF and harnrnic
Determine DC max. énd DC min.
Mjust power rnean
O VDC ± 10 mV
76 kHz± 50 Hz
Maxrnurn channel separation
Minirnum
a-ust .t up
1.6 VDC ± 0.1 V
8.4 ± 0.4 v
must light up