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Text excerpt from page 25 (click to view)
HTP-55
6.1.4 AM TRACKING ADJUSTMENT
Signal Generator.........Connects to the AM ANT. Coil through the Loop Antenna. Adjustment for the indication of VTVM of the wave form scope to be maximum.
Fig.4
6.1.5 FM TRACKING ADJUSTMENT
Signal Generator.........Connects to the FM ANT Jack (FM IN) through the dummy.