Direct Reading Wave-Meter Type 174
General Radio Company; Cambridge (MA)
- País
- Estados Unidos
- Fabricante / Marca
- General Radio Company; Cambridge (MA)
- Año
- 1919 ?
- Categoría
- Aparato de medida y servicio (Equipo de laboratorio).
- Radiomuseum.org ID
- 313805
-
- alternative name: GenRad
Perspective view of inside from behind
Atlantic Radio Co. Bulletin 14 (1919)
IRE/20s/IRE-1923-02
Haga clic en la miniatura esquemática para solicitarlo como documento gratuito.
- Principio principal
- Detector de Galena o semi-conducteur
- Número de circuitos sintonía
- 1 Circuíto(s) AM
- Gama de ondas
- OM y OL
- Tensión de funcionamiento
- Baterías recargables o pilas
- Altavoz
- - - No hay salida de sonido.
- Material
- Madera
- de Radiomuseum.org
- Modelo: Direct Reading Wave-Meter Type 174 - General Radio Company;
- Forma
- Sobremesa, caja, normalmente con tapa (panel no inclinado).
- Anotaciones
-
Wave meter (closed oscillatory circuit type) with 3 ranges, covering 130m to 3000m. Indication by crystal detector and hot-wire ammeter, readout by three scales calibrated in wavelengths on variable condenser.
Includes buzzer for operation as generator of damped oscillations.
- Precio durante el primer año
- 68.00 $
- Mencionado en
- Atlantic Radio Co. Bulletin 14 (1919)
- Autor
- Modelo creado por Nikolaus Löwe. Ver en "Modificar Ficha" los participantes posteriores.
- Otros modelos
-
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Colecciones
El modelo Direct Reading Wave-Meter es parte de las colecciones de los siguientes miembros.
Contribuciones en el Foro acerca de este modelo: General Radio: Direct Reading Wave-Meter Type 174
Hilos: 1 | Mensajes: 1
Inside the wooden housing of the GR 174B wavemeter is a square bracket and spring contacts surrounding an obvious space for a battery. In the 1920's, the Eveready 771 "C" battery measured 4" wide, 3" tall and 1.3" deep. It exactly fits the space, and the 4.5 V is about right to drive the buzzer. The 771 was a very common battery back then, and I could find no other battery that even came close to the right size and voltage. Most 771 batteries came with Fahrensotck clip connectors, but I think there were versions with simple flat contacts. So, I think it is pretty obvious that the GR 174B used a 4.5V Eveready 771 battery. BTW it's very easy to 3D print or otherwise construct a box of the right size and stuff it with 3 or 6 modern C batteries.
Anexos
- Replica 771 in GR 174B housing (251 KB)
Douglas Burum, 03.Sep.22