JPS6066527A - Tuner - Google Patents

Abstract

PURPOSE:To obtain a tuner where overall adjustment is easy and high frequency signals is inputted and outputted similarly to mounting, by forming circuits in the first case and the second case respectively and making the first case freely attachable to and detachable from the second case. CONSTITUTION:The tuner is constituted with the first case 20 and the second case 30 freely attachably and detachably. The second mixer 6 and the second local oscillator 7 are installed in an installing part 21 of the first case 20, and the first mixer 3 and the first local oscillator 4 are provided in an installing part 22, and a band-pass filter and etc. in the first intermediate frequency amplifying circuit 5 are constituted with dielectrics in an installing part 23. The installing part 23 is provided in an independent case, and installing parts 21 and 22 are provided on individual print substrates in the same case, and they form the first case. Meanwhile, in the second case 30, an RF amplifying circuit 2 is provided in an installing part 31, and a space part 32 stores the first case 20 attachably and detachably, and the second intermediate frequency amplifying circuit 8 is provided in an installing part 33.

Description

DETAILED DESCRIPTION OF THE INVENTION The field of industrial application of the present invention is the double knooper hete 1'' fin) j type <JJ,
The present invention relates to a wideband TV channel using a double-neutral one-way system.

Conventional configuration and its problemsRecently, two local oscillators and two mixed 2Gs have been implemented as a reception system that can receive a wide frequency band and does not require 1-lasoging adjustment of the channel f-horn.
A double super system was devised.This system selects the first intermediate frequency higher than the upper limit of the received signal frequency. This has the advantage of reducing the impact of

However, as the first intermediate frequency becomes higher, the circuit membrane 31. This results in unnecessary assembly and adjustment in order to stabilize the circuit structure.

A conventional tuple super one-type chicona will be described below with reference to the drawings.

FIG. 1 shows the configuration of the Duff Sumishi Nupa=Power formula.

In the figure, 1 is an RF signal input terminal, 2 is an RF amplifier circuit consisting of an AGO circuit, a filler, and an RF amplifier, 3 is a first mixer, and 4 is variable to select the RF signal to be received. a first intermediate frequency amplifier circuit including a first local oscillator, a 6-digit band pass filter, and an amplifier H, t; 6 a second mixing HH; 7 a second local oscillator; 9 is the second intermediate frequency signal output bR, : complete.

Above] In 141, the angle of movement during the following song is,
V11 will be revealed.

The RF signal -υ input from Amaz RF signal input terminal 1 is
In addition to the F amplifier circuit 2, the signal is brought to an appropriate level by an AGO circuit and an RF amplifier depending on the signal level, and then added to the first mixer 3. Next, the first local oscillation frequency from the first local oscillator 4 is converted into a first intermediate frequency and applied to the first intermediate frequency amplification circuit 5.

Then, after amplifying the required band characteristics and amplifying, in addition to the second mixing frequency, the second local oscillation frequency from the second local oscillation circuit 7 is converted to a second intermediate frequency, and the second intermediate frequency is added to the second intermediate frequency amplification circuit 8. , furthermore, the band characteristics of the nova and the second
An output signal is obtained from the intermediate frequency A1 and the lees output terminal A9.

Now, for example, in the case of an RF double signal TV signal, 1] In the case of a tree, the VHF to UHF band is 9o to 770 M I
IZ, in the case of the United States, is 64 to 890 MIIZ, so if the first intermediate frequency is set to 3 to 4 times the 2nd limit of the RF (I frequency), in the case of Japan, it is 2310-3080.
MIlz, in the case of the United States, it is 2670 to 3660 MH1, whereas in Japan, the maximum oscillation frequency of the first local oscillation frequency is 3070 to 3850 M117. In the US, it is 3560 to 4560M1lz. 2nd at the same time
In the former case, the local oscillation frequency is 2253 to 3023 M
llz, in the latter case it becomes 2626-3616 MIIZ, from the first mixer 3 to the second mixer 6! r, the circuit operates at a very high frequency, so assembly and adjustment of this part must be performed strictly.

In Figure 2, 1 is an RF (i input terminal), 12 is an installation section provided with an RF amplifier circuit 2, and 13 is a first local oscillator 4 and a first mixing unit. An installation part provided with the circuit 3; 14 a shielded space part for preventing A:15 coupling between the first local oscillator and the second local oscillator;
15 is an installation 1'1 part provided with a first intermediate frequency amplification circuit 6 and a second mixing stage 6, 16 is an installation part provided with a second local oscillator 7, and 17 is an installation provided with a second intermediate frequency amplification circuit 8. Each installation section is basically shielded by a shielding plate.

Note that 9 is an output terminal, and 21 is a 15 source supply terminal.

In the configuration described above, the output of the signal 6]J is only at each terminal 1 and 9, and as mentioned above, each circuit from the first mixer 3 to the second mixer 4 is a high frequency operating circuit. In order to adjust and measure each functional circuit section, circuits must be disconnected and disconnected, and connecting circuits requires a high degree of skill. Also, printed wiring boards with circuit components installed (
However, it had the disadvantage that it required a lot of work in terms of supplying power, inputting high-frequency signals, connecting output terminals, fixing the ground contact point, etc.

Purpose of the Invention In view of the above-mentioned drawbacks, the present invention facilitates the assembly of the most sophisticated circuits from the circuit t'i (formation of circuits), makes it possible to adjust each circuit, facilitates overall adjustment, and achieves high frequency. f
It provides a tuner that allows the human output of No. 2i to be the same as when it was installed.

Structure of the Invention The present invention provides a high-frequency circuit group in a first casing, and other circuits in a second casing; The above object is achieved by configuring the device to be detachable.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 3 is an exploded perspective view of a tuner in one embodiment of the present invention.

As is clear from FIG. 3, the tuner of this embodiment has the first
It is composed of a housing 20 and a second housing 30.

To explain the configuration of each of the casings 20 and 30, in the first casing 20, 21 is the second mixer 6 shown in FIG.
and a second local oscillator γ.
23 is an installation part in which the band filter etc. in the first intermediate frequency amplification circuit 5 is formed in the housing by a dielectric material.
7-J, in a separate and independent housing, and in the installation part 21+2
2 is provided on each printer I/board in the same casing to collectively form the first casing, but each installation portion may be a separate casing to form the first casing 20. In addition, 24a
.

24 b, 24 C, 24 d, 24 e are Jch so Jl
The signal input/output terminals of installation parts 21 and 22, 25 are '1IL
7111j Ino (feeding terminal).

On the other hand, in the second case 30, 1 is an RF input terminal, 9 is a second intermediate frequency signal output terminal, 31
1 is a section in which the RF amplifying circuit 2 shown in FIG.
33 is an installation part in which one second intermediate frequency amplification circuit 8 is placed. 34a, 34b, 34C, 346 are signal input/output terminals 24a, 24 provided in the first housing 20, respectively.
b, 2 a c, 24 d, 24 e, and the first housing 20 is the space 3 in the second housing 30.
2, the signal input/output) J terminals 24a to 246 are connected to the printed wiring of the RF amplification circuit 2 and the second intermediate frequency amplification circuit 8 in the installation section 31.33.
Each circuit between the second casings 20 and 3o is electrically coupled.

35 is a notch for the 11-L source supply terminal 25 when the first housing 20 is stored. In addition, 362L, 36 b,
36C.

36d is a power supply terminal for each circuit of the installation part 31.33.

According to the above 11, the first casing 20 and the second casing have three
0, and the second housing 30 is configured such that the first housing 20 is detachable, and in particular, the high frequency circuit group is concentrated in the first housing [1]. By doing so, each circuit can be connected to each other when adjusting or measuring it.
There is no need to do this, and the circuit connection work becomes easier.

Effects of the InventionAs I have been pleased with the invention, the present invention not only makes it easy to assemble the most flexible blocks in terms of circuit configuration, but also enables one-step adjustment, eliminating the need for overall adjustment, and allowing for higher frequencies. Due to the above input/output, the actual devices H, lj and P are missing, and therefore a large amount of paper may be required to stabilize the performance.

[Brief explanation of drawings]

11th XI i! : Block wiring diagram of a double super-heterodyne tuner, Figure 2 is Juto's Chi1. FIG. 3 is an exploded perspective view of the tuner according to the embodiment of the present invention. 1...RF signal input terminal, 2...RF amplifier circuit, 3...1st mixer, 4...1st local oscillator 1
aSS, 5...first intermediate frequency amplification circuit, 6...
...Second mixing a1'1, γ...Second local oscillator,
8--Second intermediate frequency amplification circuit, 9--Second intermediate frequency signal output terminal -f, 20-First casing, 21,
22, 23, 31. 33 installation part, 24&, 24b, 24
C, 246, 24e...Signal input/output terminal, 25+
36 &, 36 b. 36c, 36d...Power supply end A, 30...
・Second housing, 32...Space part, 34? L, 3
4b, 34C. 346.35... Notch.

Claims (4)

[Claims] (1) an input means for at least amplifying the input signal ゛υ; a first local oscillation means capable of controlling the frequency; a first mixing means for converting to obtain a first intermediate frequency signal; a first intermediate wave means for band-limiting and amplifying the output of the first mixing means; a second local oscillation means;
(by the local oscillation means)
a second mixing means for frequency converting the output of the zero wave means to obtain a second intermediate frequency signal; and a second intermediate wave means for amplifying at least the output of the second mixing means as described in 1) if, Each installation member provided with the first local oscillation means, the first mixing means, the first intermediate frequency means, the second local oscillation means, and the second mixing means is provided in the first housing, and , the respective installation portion sides where the input means and the second intermediate wave means are provided are provided in a second casing, and the first casing is detachably attached to the second casing (11).
A tuner that plays Noh. (2) The tuner according to claim 1, wherein the installation side other than the first intermediate wave means is a printed circuit board. (3) Setting of the first intermediate wave means q/(part (A is a casing) Features: 1. Claim 1. (4) When the first housing is inserted into the second housing, 'Streetcar Yuna. tuner.