JPS61105124A - Power booster - Google Patents

Abstract

PURPOSE:To simplify handling and to prevent a fault due to improper contact by detecting a transmission frequency band of a transmitter main body in a power booster of plural bands used in parallel with a transmitter of plural bands and selecting and operating the power booster of the said frequency band. CONSTITUTION:When a radio wave of a band A is outputted from a transceiver main body 2 at transmission in the power booster 3 inserted between the transmitter or transceiver main body 1 and an antenna 2, a rectified output voltage is produced to a rectifier 36A belonging to a band pass filter BPE35A having a pass band of the band A connected to an input circuit 331 of the booster 3, then the voltage is fed to a control amplifier 38 of normally OFF-type to turn on the amplifier 38. Since the conducting current is fed from a power supply Vcc through a relay coil 33C, the relay 33 is changed over to the position (b). A BPF 35B and a rectifier 36B are operated at the use of a band B, the rectified output activates the control amplifier 38 through a reversing preventing diode 37 to change over the relay 33 to the position (b).

Description

[Detailed Description of the Invention] [Field of Application of the Invention] This invention relates to a wireless communication device, in particular a radio communication device that uses a plurality of frequency bands (
Transmitter or transceiver (hereinafter referred to as band) used in
This article relates to a power booster applied to transceivers.

[Conventional technology and problems]

This type of power booster is installed between the transmitter or the transceiver and the antenna to increase the transmission power, but usually the input and output parts are connected directly inside the booster as shown in Figure 3. It has a through circuit that automatically connects the antenna directly to the main body when the booster power is turned off.

In addition, in the transmitter/receiver, even when the booster power is on, a command control voltage is applied from the transmitter/receiver side, and during reception, the booster operation is stopped and the booster is switched to a through circuit, so that the same antenna is used for both transmission and reception. It is configured to work without any problems.

Furthermore, for multiple bands, it is necessary to select a booster with the same band as the band used by the main body. For this purpose, a command and control line is installed between the transmitter body and the booster.If it is a stationary device, it is only necessary to connect it once, so there is no problem.
In the case of a vehicle, the equipment is often removed to prevent theft, and each time an extra connection is required, which can easily cause an accident, and if the booster is installed in the trunk, etc., the control requires a long time. There were problems such as the need for a line, and a countermeasure that would eliminate the need for a control line was desired.

[Purpose of the invention]

The purpose of this invention is to eliminate the command and control line connecting the multi-band transmitter or transceiver and the power booster, thereby simplifying the handling and eliminating the occurrence of accidents due to poor contact, etc.

[Summary of the invention]

The present invention is characterized in that, in a multi-band power booster used in combination with a multi-band transmitter (including a transceiver), the transmission band of the transmitter body is detected, and the power booster of the corresponding band is selected and operated. More specifically, as shown in FIG. 1, in a power booster 3, the transmitter is located between the transmitter/receiver main body 1 and the antenna 2, and the main body 1 is connected to the frequency band A and the frequency B. When operating in the band, the booster 3 is also equipped with an A-band amplifier 31 and a B-band amplifier, and the booster 30
The first relay 33 provided at the input section and the output section
3A and 33B on the output side, the a side is normally ON, the b side is normally OFF, and when the booster 3 is powered off, the input circuit 331 passes through the through circuit 332 to the output circuit 33.
It is directly connected to 3. Next, even when the power of the booster 3 is turned on, if the main body 1 is not in the transmitting state, the relay 33 maintains this state and reception can be performed through the through circuit 332.

When transmitting, when A-band radio waves are output from main unit 1,
Pandox filter C (hereinafter referred to as BPF) 35 that passes through the A hand connected to the input circuit 331 of booster 3
This produces a rectified output 'voltage in the rectifier 36A subordinate to A, which is applied to the control amplifier 38 of hoop IJ OFF, causing 38 to conduct. Since the conduction current is supplied from the power source VCE through the sea coil 33C, the relay 33 is switched to the b side. BPF 35 B when using B band
- The rectifier 36B operates, and the rectified output conducts the control amplifier 38 through the anti-reverse diode 37 and connects the relay 33 to b.
Switch to the side.

If the switching relay 34 of the A band amplifier 31 and the B punt 9 amplifier 32 is normally ON on the 31 side of the A punt 9,
When the band is used, it can be left as is, and only when 3272 is used, the control amplifier 39 is made conductive by the output of the rectifier 36B, and the energization of the relay coil 34C is switched to the b side. At the same time, the power supply of the amplifier at contact 34D is also switched. However, if the band relay operation is simply controlled by radio waves, the relay will operate when the radio wave is momentarily cut off, causing trouble, so it is preferable that the relay be of a self-holding type and be switched every time the band is changed. Its application will be described in the Examples below. ◎ [Embodiments of the Invention] Fig. 2 is an example of a circuit implementing the present invention. The same parts as in Fig. 1 are indicated by the same symbols, and the description of Fig. 1 will be made below. An explanation of the points made will be omitted.

Transmitter or transceiver body 1 is a 2-band amateur radio that can be used for both 1441 MHz and 430 MHz bands, antenna 2 is for 144 MHz and 4
30!1nlz It is a duo band antenna for both Vc. In power booster 3, BPF 35 A is 1
Passes between 44 and 146 MHz, BPF 35 B is 4
It passes between 30 and 440 MHz. The purpose is to detect the presence or absence of radio wave input in the corresponding band in the subsequent rectifiers 36A and 36B, so an out-of-band attenuation of 20 dB is sufficient, and since both bands are sufficiently far apart, There is no problem in the separation detection. Therefore, the BPF may be of a ladder type, but in this example, the simplest configuration is a double-tuned circuit in which two tuned circuits 'rl' T2 are connected by a capacitor C0, and the external circuit is a capacitor C0.
It is joined by I and 02. It is desirable that the capacitance of C1 and C2 be as small as possible to avoid the influence of external circuits.
It also has the effect of attenuating the high level of the input wave to the operating level of the rectifier diode.

The rectifiers 36A and 36B are voltage doubler rectifiers, but this is not for doubling the output voltage, but has the effect of simplifying the external circuit and reducing the attack time constant.

The control amplifiers 38A and 38B have their collector currents cut off in the fish input state, and since NPN type trannostars are used in the illustrated example, they conduct with positive rectified outputs. When 38A conducts, collector current flows through diode 41A and relay coil 33C, so contacts 33A and 33B of relay 33A
is reversed to switch the antenna circuit from a (through) to b (booster), and at the same time, the booster amplifier 3 is connected to the contact 33D.
Turn on the power of 1.32. When the transmission radio waves from the main body section stop, the relay 33 immediately returns to the a (through) side, and the power to the amplifiers 31 and 32 is also turned off.

Relay 42 is connected to 144 ME (z-band amplifiers 31 and 43
It is a self-holding (latch) type relay that selects the 0 MHz band amplifier 32, and the contact 42A connects the input part, and the contact 4
2B switches the output section, and contact 42D switches the power supply. Since this type of relay has a blank circle, a setting circuit is required to determine whether the contact is turned on to the C side or to the D side.

Since the switching control signal is outputted to the control amplifiers 38A and 38B, the electronic switch circuits 40A and 40B form a prep circuit, and a relay coil 42C is connected between the equilibrium points.
By connecting , 38A becomes conductive during 144 MHz operation and the collector potential decreases, and 40B becomes conductive by bringing the base potential of 40B closer to the collector potential, so the current flows in the direction of 40B → 42C → 38A, and at this time The contact of the relay 42 selects the 144FilIHz band on the C side, and the contact remains unchanged even if the radio waves stop. Next 4
When the 30 MHz band is input, 38B becomes conductive and 40
By bringing the base potential of A closer to the collector potential, 4OA becomes conductive, and the current flows in the direction of 40A → 42C → 38B, and the current passing direction of the relay coil 42C is reversed, so the contacts of the relay 42 are reversed to the d side. The band becomes the 430 MHz band, and is held as it is until the next input of the 144 MHz band. The self-holding of the relay can also be configured with an electronic circuit, but self-holding relays have the advantage of being reliable and stable in multiple operations.

〔Effect of the invention〕

According to the present invention, the control circuit connecting the transmitter or transmitter/receiver (8) and the power booster can be omitted, which is particularly effective in vehicle equipment.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of the configuration of the present invention, FIG. 2 is a wiring diagram of an embodiment of the present invention, and FIG. 3 is a block diagram of a conventional configuration example. l...Transmission PA or transceiver, 2...Antenna, 3
...Power booster, 31/32...Power amplifier, 3
3・U... Re-shi-, 35A・
35B...BPF, 36A
・36B... Rectifier, 37, 41A, 41B... Diode, 38, 39... Control amplifier, 40A, 40
B...Electronic switch, 42...Self-holding relay.

Claims (2)

[Claims] (1) A multi-band power booster used in conjunction with a multi-band transmitter, which detects the transmission frequency band of the transmitter itself and selects and operates the power booster in the corresponding frequency band. (2) The selection of the power booster in the corresponding frequency band is performed by using a rectifier that detects each filter output from the input section of the power booster through a band filter that passes through the operating frequency band of each power booster, and an antenna circuit based on the rectifier output voltage. 2. The power booster according to claim 1, wherein said power booster is operated by a first relay that switches from direct to a booster circuit, and a second relay that selects a corresponding power booster whose frequency band is equal to the frequency band of said bandpass filter.