Improved SW Booster No. 231
Postal Radio, New York
- Land
- USA
- Hersteller / Marke
- Postal Radio, New York
- Jahr
- 1935
- Kategorie
- HF-Verstärker
- Radiomuseum.org ID
- 354578
Klicken Sie auf den Schaltplanausschnitt, um diesen kostenlos als Dokument anzufordern.
- Anzahl Röhren
- 3
- Hauptprinzip
- HF-Verstärkung (nur)
- Wellenbereiche
- Kurzwellen (nur KW)
- Betriebsart / Volt
- Wechselstromspeisung / 110 Volt
- Lautsprecher
- - - Kein Ausgang für Schallwiedergabe.
- Material
- Metallausführung
- von Radiomuseum.org
- Modell: Improved SW Booster No. 231 - Postal Radio, New York
- Form
- Tischmodell, Zusatz nicht bekannt - allgemein.
- Bemerkung
-
The Postal Improved SW Booster No. 231 has the following features:
- Two-Stage SW TRF Preselector-Booster for TRF or Superheterodyne SW radios.
- Boosts the tuned SW signal, which is then connected to the SW radio antenna input.
- SW frequency is tuned with the booster's TRF 2-gang tuning capacitor and tuning coils. SW Radio should be tuned to the same SW band and frequency as the booster.
- Front panel SW TRF tuning coils are removable to select the SW bands (assumed the same as the earlier model):
- "A" 14-29 meters (10.3-21.4 MHz)
- "B" 29-55 meters (5.4-10.3 MHz)
- "C" 55-90 meters (3.3-5.4 MHz)
- "D" 90-200 meters (1.5-3.3 MHz)
- Powered by 110V AC.
- Power switch: On / Off.
- Volume control.
- Rear terminals: Antenna In +, Antenna In -, GND.
- Shielded cable pigtail to the SW radio: Antenna Out, GND.
- Antenna Select switch: Booster On (Antenna In + to booster, booster output to Antenna Out) / Bypass (Antenna In + direct to Antenna Out).
This model was an improvement over the earlier model for the following reasons:
- AC power now applied through a power transformer, which isolates AC Line and Neutral/GND from the chassis/GND, eliminating a possible AC shorting issue as described in the earlier model page.
- Higher B+ voltage to about 200V (from 90V) for greater gain and selectivity.
- Air vents added to the cabinet sides.
The earlier model was the Postal Short-Wave Booster.
- Literatur/Schema (1)
- -- Original prospect or advert (Short Wave Craft, December 1934, page 476 schematic and description, 491 ad.)
- Literatur/Schema (2)
- Radio Craft (January 1935, page 410 schematic and description.)
- Autor
- Modellseite von Jerry Elarton angelegt. Siehe bei "Änderungsvorschlag" für weitere Mitarbeit.
- Weitere Modelle
-
Hier finden Sie 10 Modelle, davon 4 mit Bildern und 4 mit Schaltbildern.
Alle gelisteten Radios usw. von Postal Radio, New York