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Pioneer - TX-9800 - Tuner
Manufacturer:
Equipment:
TX-9800
Date:
1978
Category:
Group:
Sub Group:

Information

RF Amplifier 2-stage FM Front End with 5-gang Variable Capacitor The RF amplif ier 2-stage front end incorporates a 5-gang variable capacitor and three dual-gate MOS FFTs. A capaci- tance-couplcd double tuned circuit is inserted between the RF amplifier stages. Those features produce impressive characteristics., such as an IMF sensitivity of 8.8dBf, a spurious response of over 110dB and an image interference ratio of over 120dB. oscillation variable capacitor, and very fine and accuratc tracking adjustments are performed in order to greatly improve the scale accuracy. Quartz Sampling Locked FM-APC Circuit for Optimum Tuning Point An automatic phase control (APC) circuit is adopted so as to safeguard against drift in the local oscillation frequency caused by fluctuations in the temperature and humidity. The frequency of the output signal from the highly accurate quart? crystal oscillator is demultiplied down to 100kHz and used as the reference signal. This enables the frequency signal of the broadcasting station to be locked properly, and allows the tuner to maintain the optimum tuning point when receiving signals over prolonged periods of lime or when recording programs on the air. Touch Sensor FM Tuning Lock System This tuner features a touch tuning system. Its quartz sampling locked APC circuit, which locks the optimum tuning point, swings into action as soon as you remove your hand from ihe tuning knob after you have tuned in a station. When the tuning knob is rotated and the signals from the broadcasting station are picked up, the TUNE indicator comes on as soon as you arrive at the optimum tuning point, and when you remove your hand from the tuning knob, the touch sensor enables or allows the APC circuit to be activated and the signals to be locked to the optimum tuning point. At the same time, the LOCKED indicator comes on to indicate that the stable reception mode is being maintained. Selectable Bandwidth FM-AM IF Amplifier According to the signal conditions, the FM-AM IF amplifier can be selected for wide band (high fidelity) and narrow band (high selectivity) modes in order to improve both the sound quality and the reception performance. A dual-element linear phase ceramic filter which possesses an excellent group delay response is used for the FM wide-band mode. This helps to reduce distortion and improve separation and the overall performance, and also provide high-fidelity FM reception with a good linearity. A 10-element linear phase ceramic filter is used for the narrow-band mode to obtain a usable selectivity of 85dB. In addition, interference-free reception becomes possible even in locations where a strong interference signal is adjacent to the station whose signals you arc tuning in. The same type of conf iguration is featured for the AM section. A 3-pole, 7-element LC bandpass filter is used for the AM wide-band mode, and a narrow band ceramic filter added to above filter is employed for the narrow band mode. As a result, interference and beat are suppressed and the signals which are received always yield the optimum sound quality. 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 cancelled out automatically without compromising the high-range frequencies. High-performancc AM Tuner with 1C The AM tuner incorporates a linear frequency 3-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. Fligh-accuracy Design for Sure-fire Reliability The dial scale features a solid diamond-cut finish, proof enough of the very high accuracy it can guarantee. Moreover, the large-sized meters for easy read out and the lever switches crafted for the best in handling ease help make up the overall design which virtually radiates with quality and sophistication.

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3 Manuals

User manual
Manual type:
User manual
Pages:
11
Size:
1.4 MB
Language:
english
Revision:
Manual-ID:
78LOI Y2S01>
Date:
January 1978
Quality:
Scanned document, all readable.
Upload date:
Sept. 29, 2020
MD5:
694ff766-74f6-1066-6c36-06f8e3964cde
Downloads:
352
Schematics diagram
Manual type:
Schematics diagram
Pages:
3
Size:
2.2 MB
Language:
english
Revision:
Manual-ID:
Date:
Quality:
Scanned document, all readable.
Upload date:
Sept. 29, 2020
MD5:
a93720c4-4305-4327-959c-e63359fc3800
Downloads:
248
Schematics diagram
Manual type:
Schematics diagram
Pages:
3
Size:
2.3 MB
Language:
english
Revision:
Manual-ID:
Date:
Quality:
Scanned document, all readable.
Upload date:
Sept. 29, 2020
MD5:
daebdc2e-9e4a-8b94-8789-28791b7c031f
Downloads:
252