Pioneer TX-7800 Tuner
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Model:
TX-7800
Date:
1979
Category:
Group:
Description:
Stereo AM/FM Tuner
Information
Significant Improvements in Accuracy, Fidelity & Convenience
■SERVO-LOCK/TOUCH SENSOR TUNING—Drift-free performance and ease of use with unique FM station selection system.
■SERVO RE-LOCK INCLUDED—Selected station is re-locked when you re-power the Tuner.
■PIONEER “CLEAN DESIGN” — High S/N ratio and low distortion in FM stereo.
■SELECTABLE AM IF BANDWIDTH-You choose WIDE or NARROW for better AM sound in any reception situation.
■HIGH SENSITIVITY/STABILITY—Enjoy true high fidelity performance every time. Sensitivity is a high 9.3dBf (1.6/<V).
FINGERTIP TUNING CONTROL
FM-Servo Lock Circuit for Optimum Tuning Point and Touch Sensor Tuning System
The servo lock circuit eliminates once and for all tuning deviations in the reception frequency caused by fluctuations in the temperature and humidity, and it makes it possible for the Tuner to maintain the optimum tuning point accurately. When the signals from the broadcasting station are picked up and the servo lock circuit swings into action, the tuning deviation is detected by the FM detector in the form of DC voltage. This is then amplified by the operational Amplifier which boasts a high gain, the local oscillation frequency is controlled and the optimum tuning point is maintained accurately all the time.
A touch sensor tuning system is combined with the servo lock circuit. After a station has been tuned in and the respective knob released, the functional tuning lock system- another standard feature— makes sure that the servo lock circuit works for optimum reception.
FM Front End with 4-gang Variable Capacitor
The tuner's front end incorporates a 4-gang variable capacitor and dual-gate MOS FETs which are well-known for their high gain and low noise characteristics. These features provide a usable sensitivity of 1.6»iV (MONO), which is high enough for all listening requirements, and also tip-top strong signal input characteristics. They are effective in the suppression of various kinds of interference and intermodulation distortion, and they guarantee stable FM broadcast reception even in weak-signal and strong-signal areas. Furthermore, slits are provided in the rotor of the local oscillation variable capacitor, and very fine and accurate tracking adjustments are performed in order to greatly improve the scale accuracy.
FM IF Section Designed for Low Distortion and High S/N Ratio
The FM IF Amplifier packs a 6-element linear phase ceramic filter which provides the best in both selectivity and phase response. There is a buffer Amplifier between the filters for a sufficiently high sensitivity, and stable reception is performed even in areas bothered by strong input interference adjacent to the station whose signals are being received. Last but not least, the completely new quadrature detector upgrades the distortion characteristics and also the signal-to-noise ratio.
MPX Circuitry Adopting PLL 1C with Built-in Automatic Pilot Signal Cancelling Circuit
The FM demodulator employs a negative feedback PLL MPX 1C with a built-in automatic pilot signal cancelling circuit. This enables the pilot signal to be canceled out automatically without compromising the high-range frequencies. As a result, the distortion is reduced considerably, the leak carrier level is suppressed, and the frequency response is extended over an even broader band.
High-performance AM Tuner with Newly Developed 1C
The AM section incorporates a 2-gang variable capacitor tuned type of RF Amplifier circuit and a highly sensitive, low distortion 1C. These features increase the Image interference and IF interference rejection capabilities of the Tuner. An optimum AGC voltage is supplied to each section, providing stable reception with low spurious interference and distortion even in localities with strong field strength areas.
Selectable Bandwidth AM IF Amplifier
According to the signal conditions, the AM IF Amplifier can be selected for a wide band (high fidelity) or a narrow band (high selectivity) mode. A wide-band filter is used in the wide band mode, making it possible to improve the band response and to receive AM programs with a good linearity and a high fidelity. On the other hand, a narrow-band filter is used in the narrow band mode for enhanced selectivity and more efficient rejection of interference.
Electronic Muting for Trouble-free Tuning
The built-in muting circuit features an 1C in the audio section. This eliminates the click noise heard when the power switch is set to the ON or OFF position and when the stations are being tuned in. Another prime function of this circuit is to suppress the annoying interstation noise and popping noise for the best in trouble-free tuning.
Manual type:
Datasheet
Pages:
5
Size:
1.57 Mbytes (1650113 Bytes)
Language:
english
Revision:
Manual ID:
Date:
1979 03 01
Quality:
Scanned document, all readable.
Upload date:
2020 08 29
MD5:
50459a23e7cc073dc243602c9d846fe4
Downloads:
220
Manual type:
Cirquit Diagram
Pages:
5
Size:
670.41 Kbytes (686495 Bytes)
Language:
english
Revision:
Manual ID:
Date:
Quality:
Scanned document, all readable.
Upload date:
2020 08 29
MD5:
512d3fec654792251f68684c89530008
Downloads:
232
Manual type:
User Manual
Pages:
12
Size:
5.85 Mbytes (6130065 Bytes)
Language:
english
Revision:
Manual ID:
ARB-311-0
Date:
1979 01 01
Quality:
Scanned document, all readable.
Upload date:
2020 08 29
MD5:
67d1466932b43132c2b30dd358c6b548
Downloads:
234
Information
Features ... 2
Installation Precautions ... 2
Connection Diagram ... 3
Connections ... 4
Antenna and Ground Connections ... 4
Front Panel Facilities ... 6
Listening to Broadcasts ... 7
Accessory Functions ... 8
FM-Dolby Reception ... 8
Installing the FM Antenna ... 9
FM Multipath Distortion ... 10
Specifications ... 11
Important-Line Voltage ... 12
Conditions Frequently Mistaken
for Malfunctions ... Insertion
Schematic Diagram ... Insertion
Manual type:
Service Manual
Pages:
5
Size:
1.35 Mbytes (1413789 Bytes)
Language:
english
Revision:
Manual ID:
Date:
Quality:
Scanned document, all readable.
Upload date:
2020 08 29
MD5:
ef85090d4f1587245c9b0678f536984c
Downloads:
180