http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-574837-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_66c37c127b4c84bee2f039e646d7a7ed |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/H03C1-00 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/H03C1-00 |
| filingDate | 1942-07-17-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1946-01-23-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-574837-A |
| titleOfInvention | High-frequency electrical translating devices |
| abstract | 574,837. Wireless signalling. STANDARD TELEPHONES & CABLES, Ltd. July 17, 1942, No. 10006. Convention date, March 25, 1941. [Class 40 (v)] An electrically saturated electret is used as the non-linear translating device in a modulator, harmonic generator or detector. Fig. 1 shows a construction of an electret which comprises a metal casing 4 containing a mixture of resin and carnauba wax which has been allowed to solidify under a saturating potential of about 8000 volts. An electrode 9 on the surface of the wax is connected by a spring to a bush 8 and lead 10 carried by an insulating cover 6. The casing 4 constitutes the other electrode. This assembly acts as a non-linear capacitance since a voltage in one direction does not increase the charge between the plates, while for a voltage in the other direction, the electret behaves as a capacitance. Fig. 2 shows an arrangement for producing harmonics from a fundamental source 13 which feeds through a coaxial line 14 and tuned-input 15 to an electret 17 arranged in a resonance chamber 11 which . can be tuned to the desired harmonic by means of a piston 16 and coaxial tuner 20. The harmonic frequency passes through an iris 26 to a wave guide 12, the diameter of which is below the cut-off value for the fundamental frequency. Similarly, the harmonic frequency is prevented from escaping into coaxial line 14 by the provision of a condenser plate 22, together with tuned circuit 15. A small gauzecovered aperture 30 communicates with a side tube 29 containing replaceable drying capsule 28 of anhydrous calcium sulphate for preserving the electret. In a modification, Fig. 4 (not shown), for use as a modulator, carrier frequency is fed to the resonating chamber and the modulating frequency is fed to the electret through a coaxial line and tuned input, the modulated carrier passing out through the wave guide. This arrangement includes filter sections tunable by oppositely arranged adjusting screws. Fig. 5 shows an arrangement for detecting modulated waves which enter the apparatus through filter sections 47, 48 of the kind described in Specification 552,394 and-pass to a demodulating chamber 49 tunable by a piston 34 and coaxial tuner 20 containing an electret 50. Unmodulated carrier frequency is fed to chamber 49 through a coaxial conductor 51 having an adjustable electrode 53, and the demodulated waves pass out through coaxial conductor 52. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-2752495-A |
| priorityDate | 1941-03-25-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
| Predicate | Subject |
|---|---|
| isDiscussedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/compound/CID24497 http://rdf.ncbi.nlm.nih.gov/pubchem/substance/SID451577746 |
Total number of triples: 13.