CN88200764U - Vidio / radio frequency converter - Google Patents
Vidio / radio frequency converter Download PDFInfo
- Publication number
- CN88200764U CN88200764U CN 88200764 CN88200764U CN88200764U CN 88200764 U CN88200764 U CN 88200764U CN 88200764 CN88200764 CN 88200764 CN 88200764 U CN88200764 U CN 88200764U CN 88200764 U CN88200764 U CN 88200764U
- Authority
- CN
- China
- Prior art keywords
- circuit
- utility
- radio frequency
- model
- vision signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 239000003990 capacitor Substances 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 208000003464 asthenopia Diseases 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 210000001503 joint Anatomy 0.000 description 2
- 238000003032 molecular docking Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 235000019504 cigarettes Nutrition 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 229910052573 porcelain Inorganic materials 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000002604 ultrasonography Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Landscapes
- Processing Of Color Television Signals (AREA)
Abstract
The utility model belongs to the technical field of signal reception and emission. The purpose and the application of the utility model are that with the inner parts of devices which can provide video signal outputs being not changed, the video signals are only input into the device of the utility model, and by utilizing the emission of signals of the device, images can be displayed on general TV sets to replace special monitors, so as to realize the display of image signals of long distance, multi-screen, and large-screen. The utility model has the advantages of convenience for carrying, easy fabrication, low cost and miniaturization and belongs to a novel product with strong practicability and low cost.
Description
The utility model belongs to signal reception, lift-off technology field.
At present institute of all kinds of large and medium-sized hospitals of China generally the B ultrasound instrument of use mostly be external introduction, a common ultrasonoscope only is furnished with a picture monitor.Be fixed with vision signal output and be connected in that the B ultrasonic instrument internal is closed with the picture monitor circuit of outside.The picture monitor screen that is equipped with ultrasonic instrument is generally 7～9 inches, because screen is less, causes inspecting doctor and relevant staff's visual fatigue easily, also is not easy to many people and observes simultaneously and demonstration teaching.
For overcoming above-mentioned deficiency, provide convenience, the utility model has designed a kind of video that separates with the ultrasonoscope main frame---radio frequency conversion equipment, its main purpose is by using the utility model device, not changing under inner any circuit of ultrasonoscope and the parts, only its vision signal is imported this device, utilize the signal emission of this device, can be on common television set display image, realize that the picture signal of remote, multi-screen, large-screen shows.
The circuit of the utility model device adopts the capacitance three-point type single-transistor oscillating circuit of distortion, with the B ultrasonic vision signal by transistor base stage input amplitude modulation after, by emitter output composite video signal, receive and show through common pal mode television set.Accompanying drawing is the circuit diagram of the utility model device.Further specify below in conjunction with accompanying drawing.China's television system adopts the negative polarity modulation at present.And vision signal has certain polarity, and as the transistor base modulation of routine, signal is imported by transistor base, it is the input of A point, the B point is as common ground point, but negative video signal input A point, after ovennodulation, because 180 ° of changes take place in phase place, to produce negative,, will before modulation, increase video and amplify inverter stage if will finish the negative polarity modulation, this just needs to increase transistor, causes circuit complicated.And in the circuit design of the utility model device, base earth with transistor BG, from the earth terminal incoming video signal, the common ground end B point that is about in its circuit is received vision signal input VFIN end, and with the common ground point of vision signal modulated terminal A end as this circuit and vision signal input VFIN end, thereby successfully finished the modulation of single-transistor video amplitude, and used direct current supply and docking machine circuit " suspension ", guaranteed being perfectly safe of butt joint instrument.This circuit structure is comparatively simple, and entire circuit has only used a transistor BG, several electric capacity, inductance, resistance to form, and has greatly simplified circuit.Capacitor C as shown in FIG.
1, C
2, C
3, C
4, C
5, C
6, C
7C
8, inductance L
1, L
2, L
3And resistance R
1, R
2, R
3In the circuit, only use a transistor BG, capacitor C
1, C
2, C
3, C
4Inductance L
1, capacitor C
7The negative polarity modulation circuit of forming main vibration circuit.
After adopting this device, produce following some tangible advantage:
1. therefore direct display image on large-screen receiver not only also can save the expense that purchase expensive large-screen dedicated monitor to the user;
2. this device can have the Medical Instruments and the miscellaneous equipment of video output with all, X-ray production apparatus for example, and the video output terminals butt joint of instrument and equipments such as CT machine video tape recorder, and do not change the internal wiring of docking machine, and realize the large scale display of a plurality of general television sets;
3. large-screen is observed, and can eliminate relevant staff's visual fatigue; Distant surveillance can be protected the radiation of X line dosage effectively, guarantees safety.
4. the use of this device can open-circuit condition, also can closed circuit state.The coverage of open circuit emission can reach tens meters;
5. this device is because simple, the used components and parts of its circuit structure are few, cost is low, be easy to production, so buying expenses is cheap;
6. this device is easy to use, and is convenient to staff's operation, the slightly same cigarette package box of this device volume, and volume is little, in light weight, be easy to carry.
Embodiment.The major parameter of this device circuit work is:
Radio frequency power output＜10mw
Tranmitting frequency 80～90MHz(megahertz)
Operating voltage DC:9～12V(volt)
0.3 meter～1 meter of transmitting antenna
Transmitting range＜15 meter
The input signal vision signal
Output signal radio frequency composite video signal
Working system Phase Alternation Line system, the colored compatibility of black and white
Exchange electric current 3～7mA(milliampere)
The voltage positive feedback of this circuit is by C
3Obtain its amount of capacity decision feedback quantity.C
4Be dividing potential drop electric capacity.L
1C
1Resonant circuit places transistor BG base stage, and frequency of oscillation is by C
2, C
1, L
1Decision, C
2Capacity is excessive, will the high frequency characteristics of vision signal be degenerated.C
5, C
6Be radio frequency commissure electric capacity, C
8Be high-frequency bypass capacitor, when selecting for use bob below 0.5 meter to penetrate antenna, C
5Select 47PF for use, when using 1 meter long hair instead and penetrate antenna, C
5Can be reduced to 15PF.Low or signal disturbs when big when receiver sensitivity, radio frequency can be exported the C point and directly link to each other with reception antenna.C
7Be vision signal commissure electric capacity, because the vision signal bandwidth is 0～6 megahertz (MH
Z), so C
7Capacity can not be less than 0.1 μ F.L
2, L
3Be radio frequency choke, in order to block radio-frequency feed to input and power supply.R
1Be biasing resistor, adjust R
2Can make the BG total current is 3～7MA.R
3Be that video voltage is adjusted resistance, controlling the rf modulations degree of transistor BG.
The specification subordinate list
BG3DG6
C
120/2 PF porcelain, half tunable capacitor that is situated between
C
215PF
C
310PF
C
42.2PF
C
547PF
C
62.2PF
C
70.1μF
C
80.01μF
R
1470Ω 1／8W
R
268K(adjusts decision) 1/8W
R
350K potentiometer with switch 1/4-1/8W
L
1φ 0.5mm silver-coated copper wire spaced winding 7 circles, coil diameter 5mm
L
2、L
320μH
E DC 9-12V powered battery
The K mains switch
Claims (2)
1, a kind of novel video input--radio frequency output conversion device, principal character is the common ground end B point in its circuit is received vision signal input VFIN end, and vision signal modulated terminal A point is imported the common ground point of VFIN end as this circuit and vision signal.
2, video input according to claim 1---the circuit of radio frequency output conversion device is characterized in that only using in the circuit transistor BG, capacitor C
1, C
2, C
3, C
4Inductance L
1, capacitor C
7The negative polarity modulation circuit of forming main vibration circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88200764 CN88200764U (en) | 1988-01-22 | 1988-01-22 | Vidio / radio frequency converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88200764 CN88200764U (en) | 1988-01-22 | 1988-01-22 | Vidio / radio frequency converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN88200764U true CN88200764U (en) | 1988-09-21 |
Family
ID=4836121
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 88200764 Withdrawn CN88200764U (en) | 1988-01-22 | 1988-01-22 | Vidio / radio frequency converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN88200764U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100418361C (en) * | 2005-06-13 | 2008-09-10 | 深圳创维－Rgb电子有限公司 | Radio video frequency bidirection switching device |
-
1988
- 1988-01-22 CN CN 88200764 patent/CN88200764U/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100418361C (en) * | 2005-06-13 | 2008-09-10 | 深圳创维－Rgb电子有限公司 | Radio video frequency bidirection switching device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C45 | Assignment of patent right | ||
| TR01 | Transfer of patent right |
Address after: No. 151, soda Springs Street, the Xinjiang Uygur Autonomous Region, Urumqi Patentee after: Xinjiang children supplies factory Address before: Coal Mine Hospital of Nanchang Road, Urumqi, the Xinjiang Uygur Autonomous Region Patentee before: Liu Jianmin |
|
| ASS | Succession or assignment of patent right |
Owner name: PATENTEE XINJIANG CHILDREN S PRODUCTS FACTORY Free format text: FORMER OWNER: PATENTEE LIU JIANMIN |
|
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |