SE204309C1

SE204309C1 -

Info

Publication number: SE204309C1
Authority: SE
Publication date: 1965-01-01

Description

KLASS INTERNATIONELLSVENSK H04 h21 a4: PATENT- OCH RP,GISTRERINGSVERKET Ans. 5803/1963 inkom den 24/1963 utlagd den 6/9 196 SIEMENS & HALSKE AG, BERLIN ocx MUNCHEN, FORBUNDSREPUBLIKEN TYSKLAND Radiolanksystem lippfinnare: H Leysieffer och E Gabler Prioritet begard frau den 25 maj 1962 (Forbundsrepubliken Tuskland) Foreliggande uppfinning avser ett radiolanksystem med en heterodynsandare, vid radiofrekvenserna utgiiras av heltalsmultiplar av en Mom ett vasentligt lagre frekvensomrade belagen grundfrekvens. CLASS INTERNATIONAL SWEDISH H04 h21 a4: PATENT AND RP, GISTRERINGSVERKET Ans. 5803/1963 was received on 24/1963 issued on 6/9 196 SIEMENS & HALSKE AG, BERLIN ocx MUNCHEN, THE FEDERAL REPUBLIC OF GERMANY Radio link system lip finder: H Leysieffer and E Gabler Priority requested from 25 May 1962 a heterodyne transmitter, at the radio frequencies emitted by integer multiples of a Mom a substantially lower frequency range coated fundamental frequency.

Radiolankutrustningar arbeta i allmanhet med heterodynsandare och heterodynmottagare, och fordra darfOr utomordentligt frekvenskonstanta oscillatorer for alstring av lokaloseillatorfrekvenserna. Kanda system av delta slag arbeta pa sa salt, att antingen ett flertal, separata kristallstyrda oscillatorer aro anordnade eller att samtliga de i hela overforingssystemet erforderliga barfrekvenserna var far sig harledes fran en enda, med hjalp av en kristall frekvensstabiliserad generator. Medan det fOrstnamnda systemet vid varje frekvensvaxling kraver en motsvarande vaxling- av oseillatorkristaller och salunda medfor de med denna vaxling forbundna svarigheterna, Or det sistnamnda systemet utomordentligt komponentkravande, vilket redan framgar darav, att vid ett liant utforande av delta system, enbart anordningarna f8r alstring av dessa barfrekvenser erfordrar tva stativskap. Radiolank equipment generally works with heterodyne transmitters and heterodyne receivers, and requires extremely frequency constant oscillators to generate the local oscillator frequencies. Known systems of this type operate on such a salt that either a plurality of separate crystal controlled oscillators are provided or that all the bar frequencies required in the whole transmission system were thus obtained from a single one, with the aid of a crystal frequency stabilized generator. While the former system requires a corresponding oscillation of oscillator crystals at each frequency shift and thus entails the responsibilities associated with this shift, the latter system is extremely component demanding, as is already apparent from the fact that in the case of a delta design, only the devices for generating these bar frequencies require two tripods.

Andamalet med foreliggande uppfinning, är darfar att vid ett radiolanksystem av det inledningsvis angivna slaget eliminera namnda svarigheter. The object of the present invention is therefore to eliminate the said equivalents in a radio link system of the type indicated in the introduction.

Enligt uppfinningen uppnas delta vid ett radiolanksystem, som Or forsett med en heterodynsandare och vid vilket radiofrekvenserna Oro heltalsmultiplar av en inom ett vasentligt lagre frekvensomrade belagen grundfrekvens fo, darigenom att det innefattar en ph den for heterodynsandaren erforderliga lokaloseillatorfrekvensen frisvangande oscilla tor och en foretradesvis kristallstyrd, pa grundfr ekvens enf.frekvensstabilis er ad grundoscillator, varvid en f8retradesvis forsumbart liten andel ay den frisvangande oscillatorns utgangsenergi samt en till den onskade radiofrekvensen frekvensmultiplicerad andel av utgangsenergin fran den frekvensstabiliserade oscillatorn aro tillf8rda ett blandningssteg, till vars utgang en pa sandarens mellanfrekvens avstarnd mellanfrekvensforstarkare och en frekvensdiskriminator aro anslutna, vilka Or anordnade att paverka en frekvensjusteringsanordning, far den frisvrangande oseillatorn for efterreglering av denna oscillators frekvensborvarde. According to the invention it is achieved to participate in a radio link system which Or is provided with a heterodyne transmitter and in which the radio frequencies are integer multiples of a fundamental frequency fo within a substantially lower frequency range, in that it comprises a ph the required oscillator frequency oscillating crystal oscillator. The fundamental frequency oscillator is a fundamental oscillator, a preferably negligible small proportion of the output energy of the free-oscillating oscillator and a frequency-multiplied proportion of the output energy to the desired radio frequency a frequency discriminator is connected, which Or arranged to actuate a frequency adjusting device, the free-rotating oscillator is given for adjusting the frequency setpoint of this oscillator.

Om i en lankrelastation s andningsfr ekvens en skiljer sig Iran mottagningsfrekvensen med ett foruthestamt frekvensvarde och skillnadsfrekvens Oven ãr en heltalsmultipel av grundfrekvensen f., Or det fordelaktigt, om en ytterligare andel av grundoscillatorns utgangsenergi uttages och frekvensmultipliceras till 'derma frekvensskillnad och den sa erhallna hOgfrekvensenergin med skillnadsfrekvensen i ett ytterligare blandningssteg blandas med en del av utgangsenergin Iran den frisvangande oseillatorn far erhallande av mottagarblandarens lokaloseillatorfrekvens. Ett likaledes fOrdelaktigt alternativ till detta bestar dari, att en ytterligare frisvangande oscillator for alstring av lokaloicillatorfrekvensen for mottagarblandaren anordnas, vats frekvens pO samma satt som for den andra frisvangande oscillatorn justeras Iran den fiir bada de frisvang,ande oscillatorerna gemensamma grundoscillatorn. Delta mojliggOr en fordelaktig vidareutveekling av systemet, genom att 2 foretradesvis den for alstring av mottagarblandarens lokaloscillatorfrekve:ns tjanande frisvangande oscillatorn forses med en frekvensmodulationstillsats for inforande av ytterligare modulationssignaler och att i frekvensjusteringsanordningarna for hada de frisvangande astillatarerna lagpassfilter infogas, vilkas ovre gransfrekvens ligger under den lagsta madulationsfrekvensen. Darvid .ardet fordelaktigt, om frekvensjusteringsanordningarna for de bada frisvangande oscillatorerna aro servomotordrivna och i modulationsledningen for den ena frisvangande oscillatorn ett hogpassfilter eller bandpassfilter dr inkopplat, vars undre gransfrekvens ligger hog-re in den av den servomotordrivna frekvensregleringens tidskonstant bestamda hogsta frekvensen. If, in a long-range transmission frequency, the reception frequency differs by a predetermined frequency value and difference frequency. This is an integer multiple of the fundamental frequency f., Or it is advantageous if an additional proportion of the fundamental oscillator's output energy is taken out and the frequency multiplied by the frequency multiplied. with the difference frequency in a further mixing step, the free-flowing oscillator is mixed with a part of the output energy Iran to obtain the local oscillator frequency of the receiver mixer. An equally advantageous alternative to this consists in arranging an additional free-oscillating oscillator for generating the local oscillator frequency for the receiver mixer, the frequency of which is adjusted in the same way as for the second free-oscillating oscillator for the common oscillators common to both free-oscillators. Delta enables an advantageous further development of the system, in that it is preferably provided with the frequency oscillator which serves to produce the local oscillator frequency of the receiver mixer that a frequency modulation additive is provided for introducing additional modulation signals. lowest madulation frequency. It is advantageous if the frequency adjusting devices for the two free-oscillating oscillators are servomotor-driven and in the modulation line for one free-swinging oscillator a high-pass filter or band-pass filter is connected, the lower limit frequency of which is higher than the frequency of the servo-motor driven frequency.

Det har vidare visat sig fordelaktigt, om frekvensmultipliceringen av grundoscillatorns utgangsenergi med frekvensen f0 sker i ett steg upp till den anskade utgangsfrekvensen med hjalp av en varaktordiodko.ppling, i vars utgang frekvensselektiva nat aro anordnade for separat uttagning av de erforderliga frekvenserna. Vid vidareutvecklingen av uppfinningen kan denna utformning erhallas, genom att skilda frekvensmultiplikatorer far de olika frekvenserna aro anslutna till grundoscillatorn med frekvensen 1,„ vilka frekvensmultiplikatorer var och en besta av en varaktordiodkoppling forsedd med ett nat far utfiltrering av ifragavarande frekvens. It has furthermore proved advantageous if the frequency multiplication of the output energy of the basic oscillator with the frequency f0 takes place in a step up to the desired output frequency by means of a varactor diode coupling, at the output of which frequency-selective natures are arranged for separate sampling of the required frequencies. In the further development of the invention, this design can be obtained, by having different frequency multipliers, the different frequencies being connected to the basic oscillator with the frequency 1, which frequency multipliers each consist of a varactor diode coupling provided with a night filter for filtering out the frequency in question.

I det foljande skall uppfinningen narmare beskrivas i anslutning till bifog.ade ritning, vilken visar ett utforingsexempel av uppfinningen, varvid fig. 1 sasom exempel visar ett frekvensschema, fig. 2 visar ett exempel pa en koppling enligt uppfinningen, sam arbetar enligt detta frekvensschema, och fig. 3 visor en vidareutveckling av ko.pplingen enligt fig. 2. In the following, the invention will be described in more detail in connection with the accompanying drawing, which shows an embodiment of the invention, Fig. 1 showing as an example a frequency diagram, Fig. 2 showing an example of a connection according to the invention, cooperating according to this frequency diagram, and Fig. 3 shows a further development of the coupling according to Fig. 2.

For att en hattre forstaelse av uppfinningens arbetssatt skall erhallas, visas i fig. 1 schematiskt sasom exempel .frekvensschemat for 6 GHz-omradet enligt CCI-normerna. -Mater en frekvensskala är forst och framst underhandet a och overbandet h avsatta. Varje frekvenshand innehaller 8 kanaler, vilka aro betecknade med la, 2a, 3a, 4a, 5a, 6a, 7a och 8a respektive lb-8b.. Avstandet mellan tva narliggande kanaler Mom ett band uppgar till 2 L. Om frekvensavstandet mellan de narmast varandra liggande kanalerna i underbandet och averbandet uppgar till 310, sa ar avstandet mellan liknumrerade kanaler i Overbandet och underbandet 17 f.. Derma skillnadsfrekvens 17 f. är schematiskt inritad i fig. 1. I regel arbetar systemet pa sa salt, att exempelvis i den forsta lankstrackan en kanal i underb.andet är anordnad som sand ningsfrekvens och den liknumrerade kanalen i overbandet som mattagningsfrekvens, medan i den darpa foljande lankstrackan forhallandena aro omkastade. Om frekvensavstandet mellan kanalerna 8a och lb skiljer sig fran 3 fo, sa maste skillnadsfrekvensen nf0 valjas pa motsvarande annat Frekvensvardet 10 Or exempelvis for 6 GHzo.mradet fastlagt till e:a 14,8 MHz. In order to obtain a better understanding of the operation of the invention, Fig. 1 schematically shows, as an example, the frequency diagram for the 6 GHz range according to the CCI standards. -Mater a frequency scale is first and foremost the subhand a and the overband h set aside. Each frequency hand contains 8 channels, which are denoted by 1a, 2a, 3a, 4a, 5a, 6a, 7a and 8a and 1b-8b, respectively. The distance between two adjacent channels with one band amounts to 2 L. If the frequency distance between them is closest to each other the horizontal channels in the lowerband and the upperband amount to 310, so the distance between evenly numbered channels in the upperband and the lowerband 17 f. This difference frequency 17 f. is schematically plotted in Fig. 1. As a rule, the system operates on such a salt that the long distance one channel in the lower band is arranged as the sanding frequency and the even-numbered channel in the upper band as the feed frequency, while in the following long distance the conditions are reversed. If the frequency distance between channels 8a and lb differs from 3 fo, then the difference frequency nf0 must be chosen on the corresponding other Frequency value 10 Or, for example, for the 6 GHzo range set to e: a 14.8 MHz.

Ett exempel pa en koppling enligt uppfinningen, som kan arbeta enligt detta frekvensschema, visas i fig. 2. Utforingsexemplet RVser en lankreldstation i ett radiolanksystem med en mottagareantenn AE och en sanderantenn AS. De mottagna elektromagnetiska vagorna, exempelvis fran kanal 7b i frekvensschemat enligt fig. 1, tillfaras via de vanliga filtren och andra kopplingselement till en mottagarblandare 12, till vars utgang en mellanfrekvensforstarkare 13 Or ansluten. Mellanfrekvenssignalen finnes vid utgangen 14 och kan direkt geno.mkapplas till ingangen 15 pi en mellanfrekvensfarstarkare 16 pa sandarsidan, vilken a sin sida matar sandarblandaren 17 for omvandling av mellanfrekvenssignalen till exempelvis sandarfrekvensen for .kanal 7a. Utgangsenergin frail denna frekvensomvandlare tillfores sandarantennen AS lampligen via en bredbandsforstarkare, exempelvis en vandringsvagror-forstarkare 18 och de normala loptidsutjamningsorganen, riktningsledarna, filtren osv. Mottagarblandaren 12 erhaller sin lokaloscillatorfrekvens genom ledningen 19 medan sandarblandaren 17 erhailer sin lokaloscillatorfrekvens genom ledningen 20.. Den till dessa hada ledningar anslutna kopplingsdelen i relastatianen ger matning Ot barfrekvensenheten eller oscillatorenheten far stationen. An example of a connection according to the invention, which can operate according to this frequency diagram, is shown in Fig. 2. The exemplary embodiment RVse shows a long-range fire station in a radio link system with a receiving antenna AE and a sander antenna AS. The received electromagnetic waves, for example from channel 7b in the frequency diagram according to Fig. 1, are supplied via the usual filters and other connecting elements to a receiver mixer 12, to the output of which an intermediate frequency amplifier 13 Or is connected. The intermediate frequency signal is located at the output 14 and can be directly connected to the input 15 of an intermediate frequency booster 16 on the transmitter side, which in turn feeds the transmitter mixer 17 for converting the intermediate frequency signal to, for example, the transmitter frequency for channel 7a. The output energy from this frequency converter is suitably supplied to the sandar antenna AS via a broadband amplifier, for example a traveling vagrange amplifier 18 and the normal maturity equalizing means, direction conductors, filters and so on. The receiver mixer 12 receives its local oscillator frequency through the line 19 while the transmitter mixer 17 receives its local oscillator frequency through the line 20. The coupling part in the relay station connected to these wires provides supply to the bar frequency unit or the oscillator unit from the station.

Barfrekvensdelen omfattar en frisvangande ho.gfrekvensgeneratar 1, vilken svanger pa den for sandarblandaren 17 erforderliga oscillatorfrekvensen om exempelvis 400 f. och som fir forsedd med en i det foljande narmare beskrivna automatisk frekvensjustering. Utgangseffekten fran denna frisvangande generator 1 uppdelas faretradesvis via en grenkoppliug 2 eller en 3-dB-riktningskopplare dels till anslutningen 20 och dels till ett blandarsteg 3. Den automatiska frekvensjusteringen Or i .det visade utforingsexemplet servomotordriven. FOr detta andamal uttages, exempelvis kapacitivt, en liten andel av den frisvangande oscillatorns 1 utgangseffekt och tillfores ett interferenssteg 9. Som ytterligare ingangsspanning Or detta interferenssteg till-fort en del av utgangsenergin fran en foretradesvis med hj alp av en kristall frekvensstahiliserad, pa frekvensen f. i frekvenssehemat 3 enligt fig. 1 svangande oscillator 5 efter foregaende frekvensmultiplicering. Frekvensmultipliceringen sker i en frekvensmultiplikatorkoppling 6, som innehhller en reaktansdiod, vars utgangskrets innehaller ett exempelvis pa frekvensen 405 fo selektivt och endast denna frekvens genomslappande filter 8. PA. detta satt upptrader pa interferensstegets 9 utgang bland annat differensfrekvensen 5 to, vilken efter motsvarande forstarkning och amplitudbegransning tillfores en frekvensdiskriminator i enheten 10, vars mittfrekvens (utgangsspanning 0) motsvarar det foreskrivna frekvensvardet 5 f.. Fran denna diskriminator styres, eventuellt efter mellanforstarkning, frekvensjusteringsmotorn 11, vilken mekaniskt astadkommer frekvensjusteringen av den frisvangande oscillatorn 1. \rid det visade utforingsexemplet tillfores vi-dare Oven en del av utgangsenergin Iran forstarkarens 6 utgang till ett ytterligare frekvensselektivt nat 7, vilket Iran frekvensmultiplikatorns & frekvensspektrum utfiltrerar en signal med skillnadsfrekvensen, exempelvis foors=17f., och ansluter denna signal som en andra ingingssignal till blandarsteget 3. Fran blandarstegets 3 utgang uttages summafrekvensen, som i det visade utforingsexemplet Or 417 f., med hjalp av en lamplig filterkoppling 4 och tillfores mottagarblandarens 12 lokaloscillatoringang 19. The bare frequency part comprises a free-swinging high-frequency generator 1, which oscillates at the oscillator frequency required for the sanding mixer 17 of, for example, 400 f. And which is provided with an automatic frequency adjustment described in more detail below. The output power from this free-swinging generator 1 is dangerously divided via a branch coupler 2 or a 3-dB directional coupler partly to the connection 20 and partly to a mixer stage 3. The automatic frequency adjustment Or in the embodiment shown is servomotor driven. For this purpose, a small proportion of the output power of the free-swinging oscillator 1 is taken, for example capacitively, and an interference stage 9 is applied. As an additional input voltage, this interference stage is still a part of the output energy, preferably with the aid of a crystal frequency stabilized. in the frequency sehemate 3 according to Fig. 1 oscillating oscillator 5 after previous frequency multiplication. The frequency multiplication takes place in a frequency multiplier coupling 6, which contains a reactance diode, the output circuit of which contains, for example, the frequency 405 fo selectively and only this frequency transmissive filter 8. PA. this occurs at the output of the interference stage 9, among other things, the difference frequency 5 to, which after corresponding amplification and amplitude limitation is supplied to a frequency discriminator in the unit 10, whose center frequency (output voltage 0) corresponds to the prescribed frequency value 5 f .. From this discriminator is controlled, possibly by intermediate frequency 11, which mechanically provides the frequency adjustment of the free-oscillating oscillator 1. In the embodiment shown, a portion of the output energy of the amplifier 6 is further supplied to an additional frequency selective night 7, which the frequency multiplier of the frequency filter multiplies. = 17f., And connects this signal as a second input signal to the mixer stage 3. From the output of the mixer stage 3 the sum frequency is taken, as in the shown embodiment Or 417 f., With the aid of a suitable filter coupling 4 and fed to the receiver mixer 1 2 local oscillator input 19.

I det visade utforingsexemplet sker frekvensmultipliceringen i stegen 6, 7 och 8 pa sa satt, att med hjalp av en varaktordiod i steg 6 en kraftig distorsion air den foretradesvis sinusformiga utgangsspanningen fran grindoscillatorn 5 med frekvensen 10 genomfores. Ur den starkt distorderade utgangssvangningen fran steget 6 kan darvid med hjalp av filter 7 och 8 de onskade frekvenserna 17 f. och 405 fo uttagas. Frainforallt filtret 8 Sr avstambart, varigenom en andring av frekvenserna vid anslutningarna 20 och 19 kan uppnas pa foljande satt. Filtret 8 avstammes exempelvis pa. den 407 :de Overtonen air 10 i stallet far pa den 405 :te overtonen. Det raeker darvid med en efteravstamning av den frisvangande oscillatorn 1 till den punkt, i vilken den servomotordrivna frekvensjusteringen 11 blir verksam. Oscillatorn 1 infangas darvid ph den foreskrivna frekvensen och fasthalles ph denna med hjalp av frekvensregleringen. Det Sr harvid lampligt, att regleromradet for frekvensregleringen Or mindre an halva frekvensavstandet mellan tva angransande kanaler i frekvensschemat i fig. 1. Sedan oscillatorn 1 med hjalp av frekvenskontrollen infangats p5. borfrekvensen, efteravstammer man lampligen oscillatorn ytterligare sa myeket, att den automatiska frekvens kontrollen har ungefar lika stort regleromrade ovanfor som nedanfor borfrekvensen. In the exemplary embodiment shown, the frequency multiplication takes place in steps 6, 7 and 8 in such a way that with the aid of a varactor diode in step 6 a strong distortion of the preferably sinusoidal output voltage from the gate oscillator 5 with the frequency 10 is carried out. With the aid of filters 7 and 8, the desired frequencies 17 f. And 405 fo can be extracted from the strongly distorted output oscillation from step 6. In particular, the filter 8 is tunable, whereby a change of the frequencies at the connections 20 and 19 can be achieved in the following way. The filter 8 is derived, for example, on. the 407th harmonic air 10 in the stable father on the 405th harmonic. A post-descent of the free-swinging oscillator 1 then suffices to the point at which the servomotor-driven frequency adjustment 11 becomes effective. Oscillator 1 is then captured at the prescribed frequency and the pH is maintained with the aid of the frequency control. It is appropriate that the control range for the frequency control is less than half the frequency distance between two adjacent channels in the frequency diagram in Fig. 1. After the oscillator 1 has been captured p5 by means of the frequency control. the drilling frequency, the oscillator is further descended to such an extent that the automatic frequency control has approximately the same control area above as below the drilling frequency.

I det visade utfiiringsexemplet har frekvensen 5 fo valts, emedan den samtidigt motsvarar den mellanfrekvens i systemet, vilken utnyttjats i forstarkarna 13 och 16. Frekvensforhallandet mellan kristallfrekvensen och mellanfrekvensen behover dock ej vara ell: heltal. Systemet har alltsa den fordelen, att mellanfrekvensen vid ett givet frekvensschema, exempelvis motsvarande figur 1, kan valjas fritt Mom vissa granser. I varje fall maste emellertid mellanfrekvensen i radiolanksystemet, ialltsa. i forstarkarna 13 och 16, vara densamma som mellanfrekvensen i den automatiska frekvensjusteringen, alltsa i forstarkare-, hegransare- och diskriminatorenheten 10. In the exemplary embodiment shown, the frequency 5 fo has been selected, since at the same time it corresponds to the intermediate frequency in the system, which is used in the amplifiers 13 and 16. However, the frequency ratio between the crystal frequency and the intermediate frequency need not be an integer. The system thus has the advantage that the intermediate frequency at a given frequency scheme, for example corresponding to Figure 1, can be chosen freely with certain limits. In each case, however, the intermediate frequency in the radio link system must, in any case. in the amplifiers 13 and 16, be the same as the intermediate frequency in the automatic frequency adjustment, i.e. in the amplifier, reviewer and discriminator unit 10.

Om en barfrekvensenhet enligt fig. 2 utnyttjas i en andstation (mottagare eller sandare) I radiolanksystemet, sa kunna enheterna 3, 4 och 7 och eventuellt ocksa 2 utga. Som an slutning Iran andutrustningen till barfrekvensenheten Mir saledes endast anslutningen 20 kvar. If a bare frequency unit according to Fig. 2 is used in a breathing station (receiver or transmitter) in the radio link system, then the units 3, 4 and 7 and possibly also 2 can output. As a connection Iran and the equipment to the bare frequency unit Mir thus only the connection 20 remains.

En vidareutveckling av den i fig. 2 visade barfrekvensenheten visas i fig. 3. I denna vidareutveckling anvandes for sandareblandare och mottagarblandaren var sin pa. det i anslutning till fig. 2 beskrivna forfarandet frekvenskontrollerad generator. Motsvarande enheter aro forsedda .med samma hanvisningsnummer, endast atskilda medelst ett primteeken. Den kontrollerade grundsvangningen fo. uttages fran en gemensam kristallgenerator 5,. sa att Oven i detta fall, bortsett frail den autamatiska frekvensjusteringens restfel, en fast skillnadsfrekvens om exempelvis L0 17 f0. mellan de hada barfrekvenssvangningarna uppnas. Komponentbehovet Or visserligen detta fall nagot storre, emedan tva generatorer 1 ocb. 1' med automatisk frekvensjustering erfordras. Emellertid erhalles den fordelen, att en av de hada generatorerna kan frekvensmoduleras, exempelvis med hjalp av en reaktansdiod 24, ,sa att i motsats till vid kanda system ytterligare talsignaler via anslutning 22 kunna inmatas vid relastationer ph radiolankstra.ckan. Det av den ytterligare modulationssignalen i .ansprak tagna omradet av basbandet far i detta fall ej belaggas vid erverforingsstrackans begynnelsepunkt. A further development of the bar frequency unit shown in Fig. 2 is shown in Fig. 3. In this further development, the sanding mixer and the receiver mixer were used separately. the frequency controlled generator method described in connection with Fig. 2. Corresponding units are provided with the same reference number, separated only by a primteeken. The controlled basic swing fo. is taken from a common crystal generator 5 ,. said that in this case, apart from the residual error of the automatic frequency adjustment, a fixed difference frequency of, for example, L0 17 f0. between the had bar frequency oscillations is achieved. The component requirement Or admittedly this case somewhat larger, since two generators 1 ocb. 1 'with automatic frequency adjustment required. However, the advantage is obtained that one of the two generators can be frequency modulated, for example with the aid of a reactance diode 24, so that in contrast to known systems additional speech signals via connection 22 can be input at relay stations ph the radio link section. The area of the baseband occupied by the additional modulation signal in this case must not be covered at the starting point of the acquisition path.

Effekten av lokaloscillatorsvangningen for mottagarblandaren kan med fordel valjas vasentligt mindre in for sandarblandaren. Fra:mforallt i detta fall Or det fordelaktigt, att frekvensmodulera oscillatorn for mottagarhlandaren med den mindre effekten. Man maste dock sorja for, att den automatiska frekvensjusteringen av den modulerade oseillatorn ej paverkas av modulationen, varfor 4 det ãr att rekommendera, att lagpassfilter infogas i regleringskretsen, Tars Ovre gransfrekvens ligger under den lagsta modulationsfrekvensen. Vid de visade utforingsexemplet fungerar servomotorn 11' far frekvensregleringen soul ett sadant lagpassfilter. The effect of the local oscillator oscillation for the receiver mixer can advantageously be selected substantially less for the sandar mixer. From: especially in this case Is it advantageous to modulate the frequency oscillator of the receiver mixer with the smaller power. However, care must be taken that the automatic frequency adjustment of the modulated oscillator is not affected by the modulation, for which reason it is recommended that a pass filter be inserted in the control circuit, the upper upper frequency being below the lowest modulation frequency. In the exemplary embodiments shown, the servomotor 11 'operates the frequency control soul such a team pass filter.

Claims

Patent claim:

A radio link system comprising a beetle transmitter, the radio frequencies being integer multiples of a substantially lower frequency range fundamental frequency f, characterized in that it comprises a local oscillator (1) which is preferably ground on the ground frequency required for the heterodyne transmitter frequency and preferably a crystalline frequency. basic oscillator (5), a preferably small amount of the output energy of the free-swinging oscillator (1) and a frequency-multiplied part of the output energy of the output energy being applied to the desired radio frequency to the frequency stabilized oscillator (5) a, interference step (9). output of an intermediate frequency tuned intermediate frequency amplifier and frequency discriminator (10) are connected, which control a free-life adjusting device (11) at the free-swinging oscillator (1) for regulating its frequency value.

Radio link system according to claim 1 for a relastation, in which the sanding frequency and the reception frequency are offset relative to each other by a predetermined frequency value and this difference frequency (rapids) is an integer multiple of the fundamental frequency f, characterized in that a further part of the basic oscillator (5) The output energy for the outputs and frequency multiplied by the difference frequency, the signal thus obtained with the difference frequency Or being connected to a further mixer stage (3) together with a part of the output energy of the free-swinging oscillator (1) for generating the local oscillator (12) of the receiver mixer (12).

3. A radio link system according to claim 1 for a relastation, in which the sanding frequency and the reception frequency are shifted by a predetermined frequency value and this difference frequency Or an integer multiple of the fundamental frequency fo, may be drawn therefrom, that it comprises an additional free-mixer (1) 12) local oscillator frequency, which. additional free-oscillating oscillator (1 ') or frequency-controlled p0 sarnma set as the free-oscillating oscillator (1) arranged for the local oscillator frequency (17) of the sand oscillator frequency from the common oscillator (5) common to the had free-oscillating oscillators.

4. A radio link system according to claim 3, characterized in that it is preferably for generating the receiver mixer. (12) Local oscillator frequency serving free-oscillating oscillator (1 ') Or provided Tried a frequency modulation unit (21) receives input of further modulation signals, and the frequency control circuits of the had free-oscillating oscillators (1', 1) contain the bypass filter filter means below the lowest modulation frequency.

5. Radiolank systeine according to claim 4, characterized in that the frequency adjusting means (11, 11 ') have the had free-oscillating oscillators (1, 1') of servomotor drive and that the modulation signal line has one free-swing oscillator. (1 ') contains a high-pass or a band-pass filter, the lower threshold frequency of which is slightly higher than the highest, of the time constant of the frequency control.

Radio link system according to any one of claims 1-5, characterized in that it comprises a varactor diode connection (6) fin frequency multiplication of the output energy from the frequency oscillating fundamental oscillator (5) in one step to the desired output frequency, to whose output frequency (7 selective frequency) 8) get separate sampling of the required frequencies Oro connected.

7. A radio link system according to any one of claims 1-5, characterized in that part comprises separate frequency multipliers connected to the ground oscillator (5) connected to the frequency fo, for the different required frequencies, each frequency multiplier each comprising a varactor diode coupling (6, 6 '). ) with a squeegee (8, 8 ') for filtering out the corresponding frequency. Request publications: