US1849859A - Method of eliminating fading - Google Patents

Method of eliminating fading Download PDF

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Publication number
US1849859A
US1849859A US219569A US21956927A US1849859A US 1849859 A US1849859 A US 1849859A US 219569 A US219569 A US 219569A US 21956927 A US21956927 A US 21956927A US 1849859 A US1849859 A US 1849859A
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US
United States
Prior art keywords
fading
carrier
side bands
frequencies
wave
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US219569A
Inventor
Weinberger Julius
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
RCA Corp
Original Assignee
RCA Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to NL26847D priority Critical patent/NL26847C/xx
Application filed by RCA Corp filed Critical RCA Corp
Priority to US219569A priority patent/US1849859A/en
Priority to DER75362D priority patent/DE481794C/en
Application granted granted Critical
Publication of US1849859A publication Critical patent/US1849859A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/12—Frequency diversity

Definitions

  • This invention relates to the art of radio telegraph signalling and deals more specifically with a method for eliminating fading in short Wave radio telegraph signal transmission.
  • the short wave radio frequency carrier wave is modulated by means of a plurality of audio frequencies generated by several separate oscillators.
  • the short wave carrier may be modulated by means of an audio frequency wave composed of 1,000, 2,000, 3,000, 4,000, or 5,000 cycles,
  • the wave form which modulates the carrier frequencies is a 1,000 cycle tone, carrying strong higher harmonics.
  • the specific apparatus used as the oscillation generators, etc., as well as the modulation and the receiving means used in connection with the present invention may be of any of the well known types now available.

Description

Patented Mar. 15, 1932 UNITED STATES PATENT OFFICE JULIUS WEIN'BERGER, OF NEW YORK, N. Y., ASSIGNOR TO RADIO GORPORATION OF AMERICA, A CORPORATION OF DELAWARE METHOD OF ELIMINA'IIN'G FADING No Drawing.
This invention relates to the art of radio telegraph signalling and deals more specifically with a method for eliminating fading in short Wave radio telegraph signal transmission.
In accordance with a specific embodiment of this invention the short wave radio frequency carrier wave is modulated by means of a plurality of audio frequencies generated by several separate oscillators. The "arious modulator frequencies difier from each other by 1,000 cycles per second. For example, the short wave carrier may be modulated by means of an audio frequency wave composed of 1,000, 2,000, 3,000, 4,000, or 5,000 cycles,
or even higher frequencies as required in order to accomplish the result. It follows from this, that the wave form which modulates the carrier frequencies is a 1,000 cycle tone, carrying strong higher harmonics.
In the operation of the transmission system in accordance with the present invention it will be seen that when the carrier wave is transmitted together with a number of side bands, the adjacent waves differ from each other by 1,000 cycles. At the receiving end ordinary detection is used, Without heterodyning. Now, if the carrier and all of the side bands get through during the transmission of a signal, a shrill 1,000 cycle tone will be heard. If only two adjacent side bands get through, a 1,000 cycle tone will also still be heard. There are, therefore, numerous possibilities, by the combination of the carrier with one or more side bands, or by combinations among the side bands themselves, of obtaining a 1,000 cycle tone at the receiving station; even if a number of component radio frequencies originally transmitted dropped out momentarily, due to fading between the transmitter and receiver. It therefore follows, that at the receiver the tone will fluctuate in quality and intensity, but the signal will not be destroyed due to fading.
The specific apparatus used as the oscillation generators, etc., as well as the modulation and the receiving means used in connection with the present invention may be of any of the well known types now available.
Application filed September 15, 1927. Serial No. 219,569.
JULIUS WEINBERGER.
US219569A 1927-09-15 1927-09-15 Method of eliminating fading Expired - Lifetime US1849859A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
NL26847D NL26847C (en) 1927-09-15
US219569A US1849859A (en) 1927-09-15 1927-09-15 Method of eliminating fading
DER75362D DE481794C (en) 1927-09-15 1928-08-09 Procedure for eliminating the effect of shrinkage in shortwave telegraphy

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US219569A US1849859A (en) 1927-09-15 1927-09-15 Method of eliminating fading

Publications (1)

Publication Number Publication Date
US1849859A true US1849859A (en) 1932-03-15

Family

ID=22819809

Family Applications (1)

Application Number Title Priority Date Filing Date
US219569A Expired - Lifetime US1849859A (en) 1927-09-15 1927-09-15 Method of eliminating fading

Country Status (3)

Country Link
US (1) US1849859A (en)
DE (1) DE481794C (en)
NL (1) NL26847C (en)

Also Published As

Publication number Publication date
DE481794C (en) 1929-08-29
NL26847C (en)

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