Re-typed in HTML format, remaining as faithful as possible to the original.
MODEL
7-2880A
FM/AM
PORTABLE RADIO
FILE TAB 7
CAUTION: THIS MANUAL IS DESIGNED FOR USE BY QUALIFIED ELECTRONIC TECHNICIANS ONLY. CONSUMER
USERS ARE URGED TO CONTACT QUALIFIED FACTORY AUTHORIZED SERVICE FACILITIES FOR REPAIRS.
FEATURES
Tuned RF on FM and AM improves reception
38" swivel whip FM antenna
7 7/8" ferrite rod AM antenna
4 IF tuned circuits on AM
AFC (Automatic Frequency Control) reduces FM drift
AFC defeat switch for fine tuning of adjacent stations
Precision vernier tuning
6 1/2" high sensitivity speaker
700mW RMS audio output
Separate bass and treble controls to personalize sound
Loudness control boosts bass at low listening levels
2-Way power with built-in AC cord
Automatic switching from AC to batteries
SERVICE SPECIFICATIONS
ELECTRICAL
120
9
Volts AC, 60 Hz
Volts DC Battery
BATTERIES
(6)
D Size Batteries
TUNING RANGE
AM
FM
530 kHz - 1610 kHz
88 MHz - 108.3 MHz
IF FREQUENCIES
AM
FM
455 kHz
10.7 MHz
POWER OUTPUT
10% DISTORTION
700
mW RMS
Minimum
SPEAKER IMPEDANCE
8
Ohm
SENSITIVITY
AM
Better than 150 uV/M for
20 dB quieting
FM
Better than 25 uV (IHFM
Sensitivity
SELECTIVITY
AM
65 dB (Minimu) for 2 ACA
Selectivity
FM
50 dB (Minimum) for 2 ACA
Selectivity
MINIMUM VOLUME
HUM
5 mV
or Less
CURRENT DRAIN
IDLE CURRENT
AM
FM
20 mA Maximum
26 mA Maximum
ALIGNMENT PROCEDURE
AM ALIGNMENT - FUNCTION SWITCH IN AM POSITION
AM Generator - RF Radiated Signal Modulated 30% at 400 Hz
GENERATOR
FREQUENCY
RADIO DIAL
SETTING
INDICATOR
ADJUST
REMARKS
1.
455 kHz
Closed
Output Meter
Across Speaker
T4, T5, T6, T9
Adjust for maximum. Repeat
until no further improvement
is noted.
2.
1630 kHz
Open
C1L
Adjust for maximum
3.
510 kHz
Closed
L5
Adjust for maximum. Repeat
steps 2 and 3 until set will tune
to both band end frequencies.
4.
1400 kHz
Tune to Signal
C1J, C1K
Adjust for maximum
5.
580 kHz
Tune to Signal
T10, L6
Adjust for maximum. Repeat
steps 4 and 5 until no further
improvement is noted.
FM ALIGNMENT - FUNCTION SWITCH IN FM POSITION
High Side of FM Sweep Generator thry a 0.04uF capacitor to TP1, Use only enough Marker Signal for Indication.
GE Superadio (1) Manual
http://earmark.net/gesr/sr1_manual.htm
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