JPH01105624A - Radio transmitter-receiver with transmission output control - Google Patents

Abstract

PURPOSE:To reduce power consumption and to lighten the load of a battery by automatically controlling a transmission output according to a reception level. CONSTITUTION:When a reception input level becomes higher than a previously set value, a reception level detection circuit 24 outputs a transmission control signal and controls the output so as to decrease the output of an amplifying part 32. When a transmission start is set by a pressing switch 6, the transmission output is radiated from an antenna 1 as an electromagnetic wave at the low output (1W). Accordingly, since when the other party of communication is in short distance, the reception level is high, the power consumption is reduced and a margin is yielded in battery capacity and it can stand for long time use.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a portable and transportable simplex wireless transmitting/receiving device having a built-in battery.

By automatically controlling the output, power consumption is reduced, thereby reducing battery load.

Wireless transmitting/receiving device C with transmission output control capable of extending call usage time: Related.

[Conventional technology]

Conventionally, portable and transportable simplex wireless transmitter/receiver C: which uses a single frequency and has a built-in battery, is independent of whether the other party is close or far away (:,
Transmission power was constant.

[Problem that the invention seeks to solve]

Therefore, even if the other party is at a short distance, the transmission output is constant, so it is not necessary (: The transmission output will be too large and the usage time for two calls will be limited by the battery capacity. There was a drawback that it became unusable immediately even if it was used for a certain period of time.

Means for Solving Problem C] The present invention has been made in order to solve the above-mentioned drawbacks. When it is determined that the reception level is above a certain level by C:, C: has means for reducing the transmission output (; thereby reducing power consumption.

Reducing the load on the battery C: Therefore, it is possible to provide a wireless transmitting/receiving device with transmission output control that can extend the communication usage time.

〔Example〕

Hereinafter, nine embodiments of the present invention will be described with reference to the drawings.

Referring to FIG. 1, a wireless transmitter/receiver with transmission output control according to an embodiment of the present invention includes an antenna 1, a receiver 2,
transmitter 3 and speaker 4.

It has a microphone 5 and a press switch 6. The receiver 2 includes a mixer (M) 21, an intermediate frequency (F) circuit 22, and a demodulator (DIM) 23, and further includes 11
It has a reception level detection circuit 24 which receives the limiter output of the circuit 22 and outputs a transmission control signal when the reception input level exceeds a preset value. The transmitter 3 includes a modulator (M
OD) 31 and an amplifying section (AMP) 32; upon receiving a transmission control signal, it stores this transmission control signal in an internal storage circuit; : Has a transmission output control circuit 33 to control.

In this embodiment, the standby state is sometimes in a state where the transmission power is high (for example, 10 W).

Let us now assume that a call situation occurs and the other party calls. Radio waves from the other party are transmitted from antenna 1 to receiver 2C
is input. In the receiver 2, the received radio waves are input to the intermediate frequency circuit 22 via the mixer 21,
The limiter output of No. 2 is input to the reception level detection circuit 24 (-).

The reception level detection circuit 24 outputs a transmission control signal when the reception input level exceeds a preset value.

This transmission control signal is transmitted to the transmission output control circuit 63 of the transmitter 3.
is input. The transmission output control circuit 33 stores this transmission control signal in the storage circuit, and at the same time controls the output of the amplification section 32 to decrease (eg, 1 W).

Here, when the transmission is activated by the press switch 6,
The transmission power is low (1W) and is radiated from the antenna 1 as radio waves.

When the press switch 6 is released, the transmission output control circuit 3
3 memory circuit is reset, and the above-mentioned standby is in the state (
However, if there is another transmission from the other party and the reception level is above a certain level, the above operation is repeated and the low transmission ability is maintained.

Therefore, when the other party is at a short distance, the reception level is high, so the power consumption is reduced and the battery capacity is spared, making it possible to withstand long-term use.

An example of transmission output and usage time is as follows:
:Become.

Transmission output switching is 10W (current consumption 15A')/IW (
Current consumption1. OA), standby mode reduces current consumption to 0.
3A, current consumption during reception Q, 6A, battery capacity 3
．． 5 AH and 1 call standby: Reception: Yog
:Become.

When transmitting output is 10W (long distance call): 3.5AH ÷ (3,5A/3 + 0.3A/3 +
0.6 A/3) = 2.4H When transmitting output is 1W (short distance call) 3.5AH ÷ (1, OA/3 + 0.3 A/l +
0.6 A/3) = 5.5H From the above, it can be seen that the usage time for short-distance calls is approximately twice that of long-distance calls, and that special C: short-distance calls are effective.

〔Effect of the invention〕

As explained above, one aspect of the present invention is to automatically control the transmission output according to the reception level.

Since the communication call time can be used to the maximum, it is advantageous, especially when two calls occur frequently over close distances.

, below margin

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a wireless transmitter/receiver with transmission power control according to an embodiment of the present invention. 1...Antenna, 2...Receiver, 5...Transmitter, 4
...Speaker, 5...Microphone, 6...Press switch, 21...Mixer (MIX), '22...
・Intermediate frequency (engineering F) circuit, 23... demodulator (DEM)
, 24... Reception level detection circuit, 51... Modulator (
MOD). 32... Amplifying section (AMP), 33... Transmission output control circuit.

Claims (1)

[Claims] 1. In a portable and portable simplex wireless transmitter/receiver that uses a single frequency and has a built-in battery, there is a monitoring means for monitoring the electric field level during reception, and a monitoring means that determines that the electric field level is above a certain level. 1. A wireless transmitting/receiving device with transmission output control, characterized in that it has a means for reducing the transmission output at the time of transmission in the case of transmission, thereby reducing power consumption and extending the usage time of a call in short-distance communication.