Am Noise Canceler Adjustment - Pioneer FX-MG8517ZT/UC Service Manual

FX-MG8517ZT,MG8817ZT

AM NOISE CANCELER ADJUSTMENT

Connection:
SSG
2-signal pad
Pulse generator
(equivalent to HP8011A)
Setting of the pulse generator (setting of
superimposed pulse)
4Vp-p(EMF)
50us
5ms
Adjustment:
1. Setting of SSG
Receiving frequency
Percentage modulation : 30%
Modulation frequency : 400 Hz
Antenna input
2. Set the system as shown in 1., then tune to a
radio station.
3. Superimpose the pulse over signal to set
modulation of SSG to OFF.
4. Use a noise meter to monitor output. Adjust
VR552 to minimize the noise level.
78
Output
FX-MG8517ZT/UC
AM dummy
antenna FX-MG8817ZT/UC
Pulse width :50µsec
Pulse intervals :5msec
Pulse voltage :4Vp-p
: 1,000 kHz
: 74 dBuV (EMF)
Noise meter