COMMUNICATION RECEIVER
FRG - 7
SPECIFICATIONS
Speaker Impedance: 4 ohms
Frequency Range 0.5 MHz 29.9 MHz
Type of Emission: AM, SSB (USB or LSB), CW
Audio Output: 2 watts
Sensitivity: SSB/CW: Better than 0.7 uV at S/N 10 dB AM Better than 2 uV at S/N 10 dB
Power Requirement; 100/110/117/2001220/234 volts AC 50/60 Hz, 12 volts DC external or interna
BATTERY HOLDER IS OPTIONAL
Selectivity' ±3 kHz at -6 dB, ±7kHz at -50dB
Power Consumption: AC I4VA
Stability: Less than #500 Hz at any 30 minutes after warm up
Size: 340 (W), 153 (H), 285 (D) mm
Antenna Impedance: High impedance for 0.5 MHz 1.6 MHz 50 ohm unbalanced for 1.6 MHz 29.9 MHz
Weight: Approx. 7 kg without batteries
SEMICONDUCTORS COMPLEMENTS
IC:
AN-214 1 SN765 14 1
FET:
35K40 3 2SK19 6
Transistor:
2SC372 8 2SC784 4
2SD313 1
Diode:
1N6OAM 9 151555 2
V068 3
Zener Diode:
WZ-l 10 1 BZ091 1
The FRG-7 has been designed for ease operation. All controls have been properly adjusted at the factory Several panel Controls and switches are unusual in operation, and an improper setting may result in poor reception.
FRONT PANEL
(I) BAND
The BAND switch is a four position switch. The switch selects the desired frequency range.
(2) ATT (NOR, Dx. LOCAL)
'The ATT (attenuator) switch attenuates the incom ing signal to prevent over-loading of the front end when an extremely stroug signal is present. At the switch NOR (normal) position.. the attenuator is removed from the input circuit.
(3) TONE (NOR, NARROW, LOW)
The TONE switch changes audio response of the receiver, The audio amplifier passes at the NOR position, 250 Hz through 3000 Hz, at NARROW 400 Hz through 2500 Hz and at LOW 250 Hz through 4500 Hz.
(4) (5) TUNING DIAL
The main TUNING knob) determines the frequency
in combination with the BAND switch and MHz setting.
(6) FINE TUNING
The FINE TUNING control is used for precise tuning of the received signal. The main tuning dial is calibrated to the frequency with the fine control at centre.
(7) VOLUME
The VOLUME controls the audio output level from the speaker.
(8) MODE
The MODE switch determines the appropriate detector in use. In the USB'CW position, the USB ( upper Side Band) and code signal is heard. In the LSB position. the LSB (Lower Side Band) signal is heard. In the AM position, the amplitude modulated signal I is heard and the Noise Limiter is put into the circuit in the AM/ANL position.
(9) LIGHT
This switch is used to turn off thc lamp so as to save the current drain when the FRG-7 is operated from internal cells.
(10) POWER
Ihis switch turns off the supply voltage for both AC and DC operation.
(11) PHONES
Phone jack is provided for private listening and the speaker is disconnected when the plug is in serted in this jack.
(12) RECORD
This jack is for recording purpose and the output level is set to approximately 50 mV regardless of setting of the VOLUME control.
(13) SPEAKER
Internal Speaker.
(14) DIAL SET
Main tuning dial calibrator.
(15) S-METER
The S-meter indicates the relative signal strength of the received signal. It is calibrated in S-unit from S-I to S-9 and in dB over S-9.
(16) LOCK
The LOCK lamp lights up when the synthesized heterodyne oscillator is unlocked.
(17) (18) MHz
This MHz control synthesizes heterodyne oscillator to the harmonics of I MHz crystal oscillator. The scale is calibrated in MHz with the frequency showing the correct setting of the heterodyne signal.
(19) (20) PRESELECT
The PRESELECTOR control tunes the receiver front end. The scale is calibrated with the frequency showing the correct setting for various bands.
REAR PANEL CONNECTION
(1) EXT SP This jack is for connection of a 4 ohm external
speaker when desired. With the plug in the S jack,
the internal speaker is disconnected.
(2) EXT DC
Receptacle for external 12 volts DC supply
(3) FUSE
Fuse for AC operation. Use 0.5 amp rating fuse.
(4) AC cord
Cord for AC operation.
(5) SW2
Coaxial connector for short wave listening.
(6) SW, BC, E, MUTE
SW is long wire antenna terminal for the shoft wave
Listening.
BC is long wire antenna terminal for the broadcast band listening.
E is ground connection.
MUTE
Is used to disable the receiver while transmitting Connect this terminal to ground for receiver muting.
AC cord holder
IN WORKING ORDER RECEIVED MANY STATIONS ON INDOOR
ANTENNA A FEW SPOTS OF RUST NEAR HANDLE SHOWEN
IN PICTURE COME WITH BOOK AND COPY OF CIRCUIT
POWER KNOB MISSING BUT SWITCH IS OK
SIGNAL DEPENDS ON PROPAGATION
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