DE1591458A1 - Shortwave radio system - Google Patents

Description

Brief r e 11 enf unksys t em The invention relates to a radio system with dividing points, in addition to a shortwave transmitter that can be set to several channels an equally adjustable shortwave receiving device and other adjustable ones Have devices for delivering and receiving selective call signals, Grobei these vreiteren devices in the idle state on the selective call signal of their own Subscriber unit are set. A safe and always possible Establishment of communication links via shortwave radio can only be guaranteed if an interference-free channel is always available for this purpose can.

Shortwave connections, even in the age of satellite radio technology To exchange messages between subscriber stations, up to several thousand Kilometers apart, cannot be dispensed with, are namely in itself very susceptible to interference because they are affected by the relatively large temporal and local Changes in the conditions in the ionosphere are dependent and as a result of the relatively strong occupancy of the shortwave bands themselves additionally mutually affect.

It is therefore an object of the invention to create a radio system with the help of which it is possible, automatically, i.e. without human intervention, and trouble-free, suitable for establishing a connection within a relatively short time Select channels from a certain set of channels and over this l a shortwave connection build up.

To solve this problem, the devices of a subscriber station in a radio system of the initially mentioned: krt according to the invention are coupled to one another and disconnected in this way. forms that in the active state of a subscriber station the reception Interception device automatically and periodically the --ui-.i structure scanned cannula provided by shortwave connections and the individual channels as free channels on the one hand, disturbed or busy channels, on the other hand, determines that a emitted selective call signal automatically via a transmission channel is emitted, which is determined to be free Reception channel is assigned, and that at the same time as the output transmission of a selective call signal b an automatic setting the receiving device on the assigned receiving channel, and the Selelctivrufeiipfai? geinrichtung on the radiated selective call signal causes rjird, and that a reception a Sel elctivrufsignals on cinci :. narrow Taften Canal the Setting :; the receiving device on this channel and the complete :: us; ° evaluation of an ielek tvriifsignal in one Participant place an autoi: atiscl: e -% liederzussendung des selective call signal received than via the assigned send channel has the consequence that the reception sends a # r @ ied back Selective call signal on one side @, iiederliolun-des Selek- tivrufes and the '- :: - pft ng of a repeat .en or a "leather sent Selel: tivrufsignals an _ ixation of the i: urz, -: cllen- Transmitting and receiving device iinjen on de :: e :: t, corresponding to ei: Channel and an AnSchalturg of low-frequency NTmessers.- b - 1 ° i. Speech v @ e; en to denurzreell :: az-e; Lindungs; reb '3e: rir :: t. In a further embodiment of the invention it is provided that for signaling a subsequent selective call signal on the part of a subscriber station, a filot frequency is first sent out, and that a first step switch which sets the receiving device of a subscriber station periodically with each switching step to a different channel is designed in such a way that an undisturbed Filotfrequency reception on a set channel fixes the step switch in the position assigned to this channel, and that a second step switch provided for the original tuning of the transmitter of a subscriber station is designed in such a way that with each switching step on the one hand the transmitter is tuned to a different channel and on the other hand one of The memory cell influenced by the assigned receiving channel is scanned and a memory cell emitted by a memory cell, eliminating an occupancy or interference in the assigned receiving channel, is determined: potential for r ort sehaltung of the stepping switch is evaluated that there is further a performance forming in a subscriber station on a particular receive channel unge: 15c * he PILD tfrequcnzcmpfang a marker desje- Nigen switching step of the second step scarf ters effected via the tuning of the transmitting device to the associated transmission channel , and that this marking - controls the second step switch in this switch position and that finally the first step switch is designed to be influenced by the transmission device of a subscriber station that an occupancy of a free transmission channel controls the first step switch in the position that a setting of the Receiving device causes the channel to which the transmission channel occupied by the subscriber station is assigned.

The shortwave transmission device is an occupied tone generator downstream that during message transfer pauses a from in the idle state located subscriber stations as an interfering tone to be evaluated busy tone over the shortwave connection path is given.

It is also provided in the radio system as a selective call signal To use tone sequence signal.

Through this training of a subscriber station of the shortwave radio system according to the invention is achieved in an advantageous manner that the per se only with With the help of a skilled surgeon, possible establishment of undisturbed shortwave connections can now take place completely automatically and reliably.

The use of a tone sequence signal as a selective call signal in the Punk systems according to the invention still has the special advantage that an interference-free, i.e. with sufficient field strength and sufficient signal-to-noise ratio successive reception of the individual tone frequencies that form a selective call signal, and which are distributed over the entire width of the voice channel ensures that the relevant channel in its entire usable frequency bandwidth for the construction, especially z. B. a voice radio short; iellen connection is suitable.

Further advantages and developments of a radio system according to the invention are an exemplary embodiment explained in more detail below with reference to FIGS removable.

The figure shows a schematic representation with omission of all not necessarily for understanding the structure and mode of operation of the radio system required parts the facilities of a subscriber station of a shortwave radio system according to the invention.

A shortwave radio system can also include subscriber stations that have the task of connecting the radio system to a wire-bound communication network. 1a In the figure / there is therefore a vertical, dashed line on the left drawn dotted line, which the facilities of a partial subscriber station, which are required for the transition to the wired communication traffic and vice versa, separates from the facilities present in all subscriber stations.

Each subscriber station has a shortwave transmitter 1 and one Shortwave receiver 2. Transmitter and receiver are each designed such that they can be reversed on all channels, which add a connection are provided.

This training can be done in particular in such a way that First of all, the shortwave cannula that is considered to be considered for establishing a connection are grouped together and shortwave transmitters and receivers then e.g. after a certain time: - or location-dependent program can be switched so that that sender and receiver during certain periods of time or in variable periods Subscriber sites depending on the location of the subscriber site in each case can only be tuned to the shortwave channels within a certain ur uppt.

Via a line 3, the shortwave transmitter receives the message to be given over the shortwave connection path in eg-down- Frequenter Fora fed and a newspaper 4 a ' The shortwave receiver 2 emits an appropriate message. In addition to the: Sender and your receiver, each participant ger a selective call transmitter 5 and a selective call receiver 6 on. The selective call generator 5 is designed so that he responds to the selective call signal of the partial neh.-create can be set. In a participant point that is responsible for the transition from wireless to wired linked _Tsachric_: tenverkehr is provided, the selective tiv caller before. one. so-called digit memory 7 bQ flows that the z.I3. arriving via a signal wire 8 . '@ Dialing signals of the wired messaging network for dis- -. evaluates the setting of the selective call transmitter. The selective call generator 5 is with the Selel: tivrufempfänger coupled to the ',; way that the selective calls "ipfän go steadily: set to the selective call signal of the selective call transmitter is. In a te.lnehr: create the necessary for the transfer of the wire bound in wireless communication traffic is the selective call receiver ö connected to a digit setter 9 schlos scn, which receives the selective- call: iignale in a for the further development of the greened binding il-. twisted: tied nacrichtenne tz suitable shape brings. The signals are transferred to the number u .-: - iet " a signal line 12 into the wired communication network. Shortwave transmitters and receivers of a subscriber station are coupled to one another via switches 10, 11 and gates 13, 14, 15. A transmission channel switch 10 sets the transmitter of the subscriber station to the individual channels. The receiver is influenced in a similar manner, quietly, via a reception channel switch 11. The receiving channel switch thus shields, for example, the shortwave receiver 2 in each of its switch positions ... n to a specific shortwave channel. If the switchover of a single receiver takes too much time, a separate receiver can be provided for each channel. The E. First of all, it is now assumed that the subscriber station is in the idle state. In the idle state, the receiving channel switch 11 is switched forward at a frequency determined by a clock generator 16. As a result, the receiver 2 is tuned to the individual channels in a cyclical sequence. The noise voltage prevailing in a channel is evaluated with respect to a threshold by a control receiver 17, which essentially consists of a bandstop filter for a pilot frequency and a broadband amplifier with a rectifier circuit. On the basis of this evaluation, a channel is either "free" or "occupied" or respectively. "Disturbed" noted.- The evaluation given by the control receiver 17 is entered into a control memory 18 via a switching arm of the receiving channel holder or another electronic or electromechanical device rotating synchronously with the receiving channel switch. The control memory stores memory cells assigned to each channel and has the task of storing a channel evaluation at least until the channel in question is checked again in the scanning cycle. As a result, the transmission switch 10 can use OR gate 13 to check which channel is currently free of interference and is therefore suitable for establishing a connection. The transmit channel switch that is used by the. Gate 13 can be influenced, sets itself and the transmitting device as a result already in the idle state on one of these free channels.

The adjustable selective call transmitter 5 and the selective call receiver 6 are set to selective calling of the subscriber station in the idle state.

If a connection to another subscriber station is now to be established, the selective call transmitter 5 and the selective call receiver 6 must first be switched over to the selective call signal of the desired subscriber station. In a subscriber station connected only to the short-wave radio network, for example a simple digit setting switch (not shown in the figure) with a start button is required for this purpose. In a subscriber station that is also connected to a wire network, the selective call generator is set via the digit memory 7, which receives and evaluates the dial characters arriving via the signal wire £ i. After completion of the setting process, the following processes are triggered in the subscriber station either with the help of a start button or through the digit memory 7: An electronic switch 21 is closed via OR circuits 19 and 20 and thus a filot frequency generator 22 4n is switched on, the transmitting device, whereby the transmission device begin with the transmission of the pilot frequency. Simultaneously with this, the gates 111 are switched through. The clock generator 16 of the receiving channel switch 11 is stopped via these gates at the point in time at which the channel is currently being scanned which is assigned to the transmission channel to which the transmitter transmits the pilot frequency. After a certain period of time (t1), to which a delay element 34 is set, the electronic switch 24 is closed via an uatter 23 and, as a result, the selective call of the desired subscriber station is emitted. At the end of the call, the delay element 25 is influenced by the selective call generator, whereby, after a period of time t2 has elapsed, a pulse coming from the selective call generator can become effective at the AND gate 26.

In the subscriber stations of the shortwave radio network, the receiving side speaks a pilot receiver 27, if the channel is scanned there over which the pilot frequency is sent, and at the same time the reception field strength is large enough. Poses in a Such Teilnehneretelle also the control receiver 17 determines that the remaining noise voltages are below the given threshold in this channel, then a gate is used 28 and a timer 29 of the clock 16 stopped and thereby the receiver on der .: Channel recorded on which the pilot frequency is received. One thing is missing of these two criteria, then the receive channel switch works vreiter and the Participation in the teaching position is then not in the fear of what follows the filot frequency broadcast Record selective call signal.

So that the filot frequency can be received with certainty, cuss the time span during which only the pilot frequency is ended can be selected in such a way that that the receiving channel switch during this period at least can scan all channels once.

At the same time as the stop criterion for the clock generator, the transmit channel switch receives 10 via gates 15 and 13 a criterion that enables him to rely on the from Set the receiver-specified channel and tune the transmitter accordingly.

The further holding of the clock and thus the receive channel switch is received by the selective call receiver immediately after the arrival of the first selective call frequency accepted as long as the transmitted tone sequence matches the one set in the selective call receiver matches. This prevents that the control recipients as "disturbance" weighted ringing tones can override the original stop criterion.

In all subscriber stations are therefore during 'the selective call transmission time little by little the channel switches were released again, excepted in one, in the received selective call signal with the one set in the selective call receiver matches.

The Selekti.vruferpfänger now solves in this subscriber station, nachüen he has received the entire signal and send ^ citig the g = eic-r. before deals, vrie them above for the calling "subscriber" panel has been described are. So it is initially in the direction of the calling subscriber as well the pilot frequency is sent during a time period t1 and then the selective call signal the called subscriber station.

In the calling subscriber station is after the end of the selective call a delay element 25 has been started. At the same time the called subscriber station has started to send the pilot frequency, the late teens after the time period expired t2 in the calling subscriber station angeko = req. its nuB even if a great one Part z. B. should have been lost by bading. The filot frequency receiver speaks 27 in good time at the calling subscriber station, i.e.

before the time period t2 has elapsed, the gate 26 is blocked and a pulse coming from the selective call generator 5 via the timer 25 has no effect. If the pilot receiver does not respond, this means that at least one of the two transmission directions is unsuitable for the connection. The pulse emitted by the timing element 25 causes then that the transmission channel switch, and because of the gate 14 switched through, too the receiving channel switch, the transmitting and receiving devices of the calling subscriber station switches to the next channel. This channel becomes vc: # "- 3 control; -receiver 17 -z «.ß. reported as faulty, then the channel switches are advanced, and as long as each free channel is found. A Such a channel change is repeated until the answer from the called subscriber station including the re-sent selective call campaign as vngeatört in the calling Subscriber cell is received; so is a. ä @ anal pair found on the one Call connection is possible.

After the selective call recipient of the calling subscriber station the complete re-broadcast selective call signal are received in this Subscriber station through switches 30 and 3 'through the speech wires and the Selective caller causes a selective call transmission together with the Transmission of the pilot frequency as an acknowledgment signal for the called subscriber station, that your answer has arrived correctly at the calling subscriber station.

The selective call receiver of the called subscriber station r then also switches through the speech wires after it has completely received the repeated selective call a second time and triggers an optical and / or acoustic call sign if the called subscriber station is only a subscriber station connected to the radio network. In a called subscriber operator who is also connected to a wire network, instead of triggering a hoof mark, a digit receiver 9 is switched on, which receives the signals required to establish a connection within the wire network and carries them out into the wire network.

In order to avoid that in the breaks in conversation an existing Connection sending devices @ from subscriber stations of the same network to the The channel used will be called in the calling subscriber station as in the firmer when the transmission-side speech cores are without voltage, and after expiry a certain response time (t51 a busy tone generator 35 is connected to the transmitter.

The control receiver 17 of all not involved in the connection Subscriber stations eliminate this busy tone as interference voltage and thereby prevent that their transmission equipment can switch to this channel.

At the end of a conversation it is not absolutely necessary to have an ending sign to be transferred, since the connection is broken independently by both sides can be.

Claims (3)

P a t e n t ans p r ti c h e 1. Pünksysten with participant offices, which, in addition to a shortwave transmitter that can be set to multiple channels, -'eine also adjustable shortwave receiving device '' - 'and other adjustable devices for delivering and: - @ - for receiving selective call signals, these further Devices in the idle state on the selective call signal of their own subscriber station a-. represents are "characterized by such a training and coupling of all of these facilities, that in the idle state of a subscriber station the receiving facility automatically and periodically those intended for setting up shortwave connections Channels scanned and thereby the individual channels as free channels on the one hand, disturbed or busy channels, on the other hand, determines that a selective call signal to be issued is automatically broadcast via a transmission channel that is determined to be free Receiving channel is assigned, and that at the same time with the .Aausendung of a selective call signal an automatic setting of the receiving device to the assigned receiving channel and causing the selective call receiving means to respond to the broadcast selective call signal is, and that a reception of a selective call signal on an undisturbed channel the Setting the receiving device to this channel and the complete evaluation a selective call signal in one Subscriber station an automatic Repeat transmission of the received selective call signal via the assigned transmission channel has the consequence that the receipt of a resent selective call signal a Send-side recovery of the selective call. and receiving one again or a re-sent Selective ufsial a fixation of the shortwave transmission - and receivers on the respective channel and a J- 'circuit of causes low-frequency message or speech paths to the shortwave connection path. 2. Radio system according to claim 1, characterized in that for signaling a subsequent selective call 'signals on the part of a subscriber plug initially one Pilot frequency is sent, and that a receiving device of a subscriber atoll The first one adjusts periodically with each switching step to a different channel Step switch is designed in such a way that an undisturbed pilot frequency reception on a set channel the step switch in the assigned channel Fixed position. 3. Radio system according to claim 1, characterized in that a second step switch provided for Ur.istirmung the transmitting device of a subscriber station is designed in this way. did that with each switching step on the one hand Sending device to a different channel in each case. atimt and change one of the assigned Enp- fangsktnal influenced memory cell scanned and thereby-one-delivered by a storage cell, one Positioning or disturbance of the assigned receiving channel si (nalieierendea certain potential for switching the step switches is evaluated. . Puunksyeten according to claims 2 and 3, characterized by such a training that a part neitrstelle on-a certain receiving channel takes place- gender undisturbed pilot frequency reception a marker the switching step of the second step switch causes a vote of the transmitting device takes place on the assigned transmission channel, and that this Mark the second step switch in this switching Stallunß controls. 5. radio cysts according to claim 2, characterized in that the first step switch in the; iron of the transmitter Direction of a subscriber station designed to be influenced is that an assignment of a free transmission channel corresponds to the most step switch controls in the position that an adjustment of the receiving device to the channel causes the transmit station occupied by the ve @ ler channel is assigned. 6. Radio system according to one of the preceding claims, da- 'by gekennzeicl: r..et that the Kurziiellensendecinrichtung such a busy tone generator is connected downstream that a busy tone to be evaluated by subscribers in the idle state as an interference tone is given over the shortwave connection path during message transmission pauses. 7. runksysten according to one of the preceding claims, characterized in that a tone sequence signal is used as a selective call signal.