US1480891A - High-frequency receiving system - Google Patents

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M H. BECKER HIGH FREQUENCYRECEIVING SYSTEM Filed July 2o'. i921' HOWARD I. BECKER,

Patented -J 15, 1.924;

i-"jUNlTEDfsTATE-s nIGI'I-EREQIENCY PATENTOF ELECTRIC RECEIVING SYSTEM.

.ApplicationA led July 20, 1921.` ySerial No. 486,218.

ToaZZ lwhom z't may concern:`

Be it known that I, HOWARD I. BECKER, a citizen ofthe United States, residing at Schenectad in the county of Schenectady, vState of l\ew York,- have invented certain 'new and useful Improvements in High-Freuency Receiving Systems, of `*which the ollowing isv a specification. i

My present invention relatesto means for receiving -high frequency signals, and more particularly to a system in which vacuum ytube amplifiers are employed forthe ampli-lv v vacuum tube systems for high frequency amplification disturbing currents of low frequency may be introduced into,r the sys-` tem by reason of certain internal irregulari-y ties' in the operation of the vacuum tubes Where several vacuum 'tubes' are employed amplified alon in cascade these .disturbing currents are with the high frequency currents, and-i transmitted to the detecting apparatus will affect `that apparatus to such an extent as t interfere with the detection ofathe desired signals.- v

-Inorder to overcome this `disadvantage I\ provide between the apparatus which is employed for amplifyin the high frcquenc currents and the etectingappara- Etus a k'circuitwhich is so arranged as to eifetivel v transmit to the detecting apparatus the igh frequency signaling currents and which will efectively prevent the'transmission to the 'detecting apparatus of any low frequencyl disturbing l'currents which are set up in the amplifying apparatus either by reason oftheirregularities 1n the operation of the apparatus, or by interaction betweenthe desired signalingcurrents and other currents 'of a neighboring frequency which may be impressed upon the am lifying apparatus. lc a l,

' n carrying my invention into eect I .preferably arrange the output coil of the amplifying apparatus in noninductive relation to the input coil of the detecting ap-y paratus. One form of link circuit which may be employed to advantage is made up of an inductance and capacity, the inductance being coupled to both the output coil of the amplifying apparatus and the input coil of the "detecting apparatus. If this link circuit.' is tuned for the frequency ofl the high frequenc signaling currents'to be detectedit will e ciently. transfer such currents to thetransmitting apparatus without 1,480,891 Fics.

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transmitting to anyappreciable extent Aany low frequency currents which may be impressed upon the output coil of the amplifying apparatus.`

The novel features which I believe vto be I characteristic of my invention are. set forth -in the-appended claims, the'invention itself,

however, both as to its organization andk Vmethod of operation will best be understood by reference to the. following de- -scription 'taken in connection' with the accompanying drawing in which vI have indicated diagramatically one way in which my invention may be carried into effect.

I `have indicated in the drawing the application of my invention to a radio receiving system for amplifying and detecting signaling currents received upon the an- `tenna 1 Itywill ofcourse be understood y that it may equally well be employed'-for Athe reception and detection of high fre-- quency currents received overI wireline.

" 'The signaling currents received upon the 4 antenna `1 are impressed by meansof the usual Vcoupling transformer 2 upon the reso- 'nant input circuit 3--of the radiofrequency amplifier 4 Vwhich may comprise as many stages of vacuum tube amplifiers as desired in order to secure 'the necessary :degree of amplification. The output circuit of thelamplifier iincludes a coil 5 which is' arranged in non-inductive relation to the input coil 6 vof the detector 7. A link circuit between `coils 5 and 6 -is made upof a capacity 8 f and inductance, 9, which is arranged in inductive relationto both coils 5 and,l but is loosely coupled thereto. Thislink circuit is tuned to the frequency of the signalin, ,"cur` rents to be detectedv and may be so adjusted as to transmit such currents between coil 5 and coil 6v without transferring from one coil tothe other any appreciable amount of the low frequency currents'set up-in coil 5.

If desired an audio frequency amplifier 10 may be inserted between the detector 7 and v the usual receiving telephones 11.

What I claim as new and desire to secure by Letters Patent of the United States, is: l; The combination in a high frequency signal receiving system of means for amplifying received signaling currents,means for detecting the amplified currents and a link circuit comprising a single inductance which is inductively connected between the amplifying means and the detecting means for supplying currents of signaling frequency to the detecting means and preventing the transfer to the detecting means'of audio frequency currents.

2. The combination in a high frequencyvl signal receiving system of means for amplifying received signalin currents, means for detecting Athe amplifie currents, -an output coil for amplifying means and an input coil y' for the detecting means, said coils being in non-inductive relation to each other, andalink circuit between said coils comprising a single inductance which is in inductive "relation to both of said coils.`

3. The combination in a high frequency si alreceiving system of'm'eans for amplifying received signaling currents, means Vfor detecting the amplified currents, an output4 -coil for the amplifyingmeans and an in ut" coil for the detectingmeans said coils being detecting the amplified currents, an output coil for the amplifying means and an input coil for the detectinov means,said coils being in non-inductive relation to each other and 40 ysignal receiving system of means for amplip fying received signaling currents, means for4 a link circuit between said coils comprising a capacity and asingle inductance which is in inductive relation to both of said coils.

In witness whereof, I have hereunto setA150 my hand this 19th day of July, 1921.

HOWARD I. BECKER.`

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