247-E: Difference between revisions
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{{Catalog History}} | {{Catalog History}} | ||
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The {{Title|General Radio 247-E Variable Air Capacitor}} | The {{Title|General Radio 247-E Variable Air Capacitor}} was introduced in {{Bulletins 1923}} and remained available through {{Bulletin 933}}. | ||
The Type 247-E is a general purpose air variable capacitor used in the construction of radio receivers and transmitters and experimental use. The 247-E is part of the 247 series of mounted variable capacitors | The Type 247-E is a general-purpose, air-variable capacitor used in the construction of radio receivers and transmitters and experimental use. | ||
The 247-E is part of the [[247 series]] of mounted variable capacitors. | |||
Unmounted versions were available as components at a reduced cost. | |||
Mounted versions were supplied with a dial, panel and drawn steel case. | |||
The 247-E is constructed of brass stator and rotor plates using soldered construction. | |||
The capacitor is operated by a slow-motion drive and counter-weighted die cast gear. | |||
The dial is calibrated in capacitance and 0 to 100 logging scale. | |||
==Specifications== | ==Specifications== | ||
Latest revision as of 22:48, 27 May 2024
The General Radio 247-E Variable Air Capacitor was introduced in Bulletins 1923 and remained available through Bulletin 933 (1931).
The Type 247-E is a general-purpose, air-variable capacitor used in the construction of radio receivers and transmitters and experimental use. The 247-E is part of the 247 series of mounted variable capacitors. Unmounted versions were available as components at a reduced cost. Mounted versions were supplied with a dial, panel and drawn steel case. The 247-E is constructed of brass stator and rotor plates using soldered construction. The capacitor is operated by a slow-motion drive and counter-weighted die cast gear. The dial is calibrated in capacitance and 0 to 100 logging scale.
Specifications
- Capacitance: 500 pF
- Zero Capacitance: 20 pf
- Maximum Voltage: 500 V peak
- Calibration:Dial is calibrated directly in pF, accurate to 3% of full-scale reading