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Stancor Standard Transformer Corporation ST-202A Nadajnik
Stancor Standard Transformer Corporation
Modelu: ST-202A
Kategorii: Radiokomunikacja
Grupa: Nadajnik
Opis: Radio Transmitter Kit
                                    Stancor Model ST-202-A fulfills the demand for a compact,
desk type, high frequency, radio transmitter having
substantial power output- Internal circuits for
radiotelephony were purposely omitted to satisfy the
“strictly CW1' operator as well as to offer the "phone man11
a choice of either amplitude or frequency modulation. Hence,
either type of modulation may be ultimately applied.

Such important features as six band coverage (10, 11, 15,
20, 40, and 80 meters),

inter- and intra-band flexibility, and extreme simplicity of
adjustment and control w ere

included without resorting to complexities. Base of
construction was given paramount consideration in the design
of this unit.

The ST-202-A incorporates a novel and highly simplified
band-switching exciter circuit involving only two receiving
type tubes, a single deck coil turret, and one tuning
capacitor. The radio frequency power amplifier employs a
triode transmitting tube in a balanced, neutralized circuit
for stable, trouble-free operation. For this position,
several tubes are recommended (see ACCESSORIES) and a choice
may be made according to the dictates of the individual
operator. To meet all of the requirements of the various
triodes listed, the ST-202-A provides a range of amplifier
filament voltages of 5.0, 6.3, and 7.5, and a wide range,
neutralizing capacitor. The amplifier tank circuit uses 150
watt plug-in inductors of standard availability, one being
required for cach major frequency range. A link coil, with
variable coupling adjustment, facilitates proper loading of
the amplifier by the antenna system. Quick channel shifting
is accomplished by pancl-switch selection of six different

Separate power supplies develop 350 volts DC for the exciter
stages and 1,000 volts DC for the amplifier stage. The
exciter power supply is electrically inverted so that it may
also provide a grid bias potential for the amplifier tube.
Further, this system allows simultaneous screen keying of
both exciter tubes, giving clean-cut, telegraphic signals

along with the highly desirable “break-in” feature of operation.

Both grid and plate current readings of the final amplifier
tube arc taken with a

single milliammeter employed in a switching system.

Suitable terminals at the rear of the cabinet provide
connections to an antenna system, a telegraph key, a remote
standbyr switch, an antenna changeover relay, and an
amplitude modulator. An extractor type fuse receptacle and
the 117 volt AC line cord are also located at the rear.

The output of a frequency modulator or a variable frequency
oscillator may be introduced into one of the six crystal

Te Podręczniki są dostępne dla powyższego urządzenia:

Typ instrukcji: Serwis i User Manual Stancor-8048-Manual-Page-1-Picture
Stron: 38
Rozmiar: 2.29 Mbytes (2406127 Bytes)
Język: Angielski
Podręcznik numer:
Jakość: Skanowany dokument, czytając częściowo źle, nie częściowo czytelny.
Data wysłania:
MD5: fc9de2c72b6f8c67c9225d2f31b69138
Pliki do pobrania: 108 od 18 wrzesień 2016

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