CN106712805A - Shortwave pre-post selector - Google Patents
Shortwave pre-post selector Download PDFInfo
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- CN106712805A CN106712805A CN201611263611.0A CN201611263611A CN106712805A CN 106712805 A CN106712805 A CN 106712805A CN 201611263611 A CN201611263611 A CN 201611263611A CN 106712805 A CN106712805 A CN 106712805A
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 6
- 238000004393 prognosis Methods 0.000 claims description 36
- 230000005540 biological transmission Effects 0.000 claims description 11
- 230000003321 amplification Effects 0.000 claims 1
- 238000003199 nucleic acid amplification method Methods 0.000 claims 1
- 238000004891 communication Methods 0.000 abstract description 5
- 238000001914 filtration Methods 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/713—Spread spectrum techniques using frequency hopping
- H04B1/715—Interference-related aspects
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/713—Spread spectrum techniques using frequency hopping
- H04B1/715—Interference-related aspects
- H04B2001/7152—Interference-related aspects with means for suppressing interference
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Transmitters (AREA)
Abstract
The invention belongs to the technical field of digital tuning frequency hopping communication, and discloses a shortwave pre-post selector, which is high in frequency hopping speed, stable and reliable to work and is stable to realize higher selectivity; the shortwave pre-post selector is arranged in a shortwave radio station, and a pre-selector signal input end, a post selector signal input end, a pre-selector signal output end and a post selector signal output end are arranged on the shortwave pre-post selector; and the shortwave pre-post selector comprises a control unit, an amplitude limiting protection unit, a first transmitting-receiving conversion unit, a first wave band conversion unit, a first resonant unit, an amplifying unit, a second resonant unit, a second wave band conversion unit and a second transmitting-receiving conversion unit.
Description
Technical field
Device is selected the invention belongs to digital tuning Frequency-hopping Communication Technology field, more particularly to a kind of shortwave prognosis.
Background technology
With the continuous progress of Frequency-hopping Communication Technology, prognosis selects device with its superior function index by increasing designer
Accreditation, is widely used in military, commercial signal communication system, and it is presented matching transmission to logical in-band frequency, to resistance in-band frequency
Mismatch and carry out reflection loss, so as to realize signal spectrum filtering function.
Device is selected in traditional shortwave prognosis, using the pattern for first amplifying again two stage filter more than preselector, then selects that device then more to be adopted
The pattern amplified again with first two stage filter, the shortwave prognosis of this pattern selects that device dynamic range is big, intermodulation index preferably, but choosing
Selecting property is relatively poor.
The content of the invention
For the shortcoming of above-mentioned technology, the present invention provides a kind of shortwave prognosis and selects device, and frequency hopping speed is fast, and working stability can
Lean on, can realize that device is selected in selectivity shortwave prognosis higher.
To reach above-mentioned purpose, the present invention is adopted the following technical scheme that and is achieved.
Device is selected in a kind of shortwave prognosis, and the shortwave prognosis selects device to be arranged inside short-wave radio set, and device is selected in the shortwave prognosis
On be provided with preselector signal input part, after select device signal input part, preselector signal output part and after select device signal output part；
The shortwave prognosis selects the device to include：Control unit, limited amplitude protection unit, the first transmitting-receiving converting unit, first band converting unit,
First resonant element, amplifying unit, the second resonant element, second band converting unit and the second transmitting-receiving converting unit；
Control signal of the control signal output of described control unit respectively with the described first transmitting-receiving converting unit is input into
End, the second transmitting-receiving control signal input of converting unit, the control signal input of the first band converting unit,
The control signal input of the second band converting unit, the control signal input of first resonant element and described
The control signal input of two resonant elements is connected in parallel；
The signal input part of the limited amplitude protection unit is used as preselector signal input part, the letter of the limited amplitude protection unit
First signal input part of number output end connection the first transmitting-receiving converting unit；Second letter of the first transmitting-receiving converting unit
Number input selects device signal input part after；The signal output part of the first transmitting-receiving converting unit turns with the first band
Change the signal input part connection of unit, the letter of the signal output part of the first band converting unit and first resonant element
The connection of number input, the signal output part of first resonant element is connected with the signal input part of the amplifying unit, described
The signal output part of amplifying unit is connected with the signal input part of second resonant element, the signal of second resonant element
Output end is connected with the signal input part of the second band converting unit, the signal output part of the second band converting unit
Signal input part with the described second transmitting-receiving converting unit is connected, and the first signal output part of the second transmitting-receiving converting unit is made
It is preselector signal output part, the secondary signal output end of the second transmitting-receiving converting unit selects device signal output part after.
The characteristics of technical solution of the present invention and further it is improved to：
(1) described control unit is used to receive the Serial Control instruction of short-wave radio set main control unit transmission, and by the string
Row control instruction is converted to 16 parallel-by-bit control codes, wherein, the 1st to the 8th control code be used to setting the first resonant element and
Second resonant element produces resonant frequency；9th and the 10th is used to select first band converting unit and second band to change
The wave band of cell operation；11st is used to control the first transmitting-receiving work shape for receiving and dispatching converting unit and the second transmitting-receiving converting unit
State；12nd to the 16th is reserved place；
When being 0 for the 11st, the first transmitting-receiving converting unit and the second transmitting-receiving converting unit are operated in reception shape respectively
State, when being 1 for the 11st, the first transmitting-receiving converting unit and the second transmitting-receiving converting unit are operated in transmission state respectively；Or
Person, when being 0 for the 11st, the first transmitting-receiving converting unit and the second transmitting-receiving converting unit are operated in transmission state respectively, when
11st be 1 when, it is described first transmitting-receiving converting unit and second transmitting-receiving converting unit be operated in reception state respectively.
(2) operating frequency range of the first band converting unit and the second band converting unit is 1.6MHz-
30MHz, the operating frequency range 1.6MHz-30MHz point are 1.6MHz-3.999MHz wave bands, 4MHz-9.999MHz wave bands,
10MHz-30MHz wave bands.
(3) described control unit is made up of two shift register cascades.
(4) the limited amplitude protection unit is composed in series by two power-type PIN diodes.
(5) the first transmitting-receiving converting unit and the second transmitting-receiving converting unit are respectively adopted alternative electronic switch.
(6) the first band converting unit and the second band converting unit are respectively adopted four and select an electronic switch.
(7) first resonant element and second resonant element are respectively adopted integrated shortwave frequency hopping wave filter, and
The working frequency of the integrated shortwave frequency hopping wave filter is 1.6MHz-30MHz.
(8) the integrated shortwave frequency hopping wave filter is packaged using radome.
The present invention has advantages below compared with existing technologies：Shortwave prognosis of the invention selects device to amplify again using first filtering
Then the pattern for filtering again, prognosis selects the noise floor of device small, and selectivity is high；Control unit uses shift register, controlling party
Formula is simple, changes frequency speed fast.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the structural representation that device is selected in a kind of shortwave prognosis provided in an embodiment of the present invention.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
The embodiment of the present invention provides a kind of shortwave prognosis and selects device, as shown in figure 1, the shortwave prognosis selects device to be arranged at shortwave
Inside radio station, the shortwave prognosis select be provided with device preselector signal input part, after select device signal input part, preselector signal
Output end selects device signal output part with after；The shortwave prognosis selects the device to include：Control unit, limited amplitude protection unit, the first transmitting-receiving
Converting unit, first band converting unit, the first resonant element, amplifying unit, the second resonant element, second band converting unit
And second transmitting-receiving converting unit；
Control signal of the control signal output of described control unit respectively with the described first transmitting-receiving converting unit is input into
End, the second transmitting-receiving control signal input of converting unit, the control signal input of the first band converting unit,
The control signal input of the second band converting unit, the control signal input of first resonant element and described
The control signal input of two resonant elements is connected in parallel；
The signal input part of the limited amplitude protection unit is used as preselector signal input part, the letter of the limited amplitude protection unit
First signal input part of number output end connection the first transmitting-receiving converting unit；Second letter of the first transmitting-receiving converting unit
Number input selects device signal input part after；The signal output part of the first transmitting-receiving converting unit turns with the first band
Change the signal input part connection of unit, the letter of the signal output part of the first band converting unit and first resonant element
The connection of number input, the signal output part of first resonant element is connected with the signal input part of the amplifying unit, described
The signal output part of amplifying unit is connected with the signal input part of second resonant element, the signal of second resonant element
Output end is connected with the signal input part of the second band converting unit, the signal output part of the second band converting unit
Signal input part with the described second transmitting-receiving converting unit is connected, and the first signal output part of the second transmitting-receiving converting unit is made
It is preselector signal output part, the secondary signal output end of the second transmitting-receiving converting unit selects device signal output part after.
Specifically, described control unit is used to receive the Serial Control instruction of short-wave radio set main control unit transmission, and by institute
State Serial Control instruction and be converted to 16 parallel-by-bit control codes, wherein, the 1st to the 8th control code is used to set the first resonance list
Unit and the second resonant element produce resonant frequency；9th and the 10th is used to select first band converting unit and second band
The wave band of converting unit work；11st is used to control the first transmitting-receiving work for receiving and dispatching converting unit and the second transmitting-receiving converting unit
State；12nd to the 16th is reserved place；
When being 0 for the 11st, the first transmitting-receiving converting unit and the second transmitting-receiving converting unit are operated in reception shape respectively
State, when being 1 for the 11st, the first transmitting-receiving converting unit and the second transmitting-receiving converting unit are operated in transmission state respectively；Or
Person, when being 0 for the 11st, the first transmitting-receiving converting unit and the second transmitting-receiving converting unit are operated in transmission state respectively, when
11st be 1 when, it is described first transmitting-receiving converting unit and second transmitting-receiving converting unit be operated in reception state respectively.
The limited amplitude protection unit is used to limit the amplitude of preselector signal input part input signal；
The first transmitting-receiving converting unit and the second transmitting-receiving converting unit are used under the control of described control unit
Switching preselector receive signal or after select device sending signal；
The first band converting unit and the second band converting unit are used under the control of described control unit
Select corresponding working frequency range；
First resonant element and second resonant element be used for produced under the control of described control unit it is right
The resonant frequency answered；
The amplifying unit is amplified to reply input signal.
Further, the operating frequency range of the first band converting unit and the second band converting unit is
1.6MHz-30MHz, the operating frequency range 1.6MHz-30MHz point is 1.6MHz-3.999MHz wave bands, 4MHz-
9.999MHz wave bands, 10MHz-30MHz wave bands.
Further, described control unit is made up of two shift register cascades.
Exemplary, the shift register uses 74HC164D.
Further, the limited amplitude protection unit is composed in series by two power-type PIN diodes.And the limited amplitude protection
Unit can bear the radiofrequency signal input power of 100W.
Further, the first transmitting-receiving converting unit and the second transmitting-receiving converting unit are respectively adopted alternative electronics
Switch is realized.It is exemplary, when in 16 parallel-by-bit control codes the 11st be low level when, after select device to work, first transmitting-receiving
Converting unit and the second transmitting-receiving converting unit are operated in transmission state；When the 11st is high level in 16 parallel-by-bit control codes
When, preselector work, the first transmitting-receiving converting unit and the second transmitting-receiving converting unit are operated in reception state.
Further, the first band converting unit and the second band converting unit are respectively adopted four and select an electronics
Switch is realized.It is exemplary, when the 9th in 16 parallel-by-bit control codes, the 10th be all low level when, first band 1.6MHz~
3.999MHz works；It is low level when the 9th, the 10th when being high level, the second ripple short 4MHz~9.999MHz work；When
9 is high level, the 10th when being low level, the 3rd wave band 10MHz~30MHz work；When the 9th, the 10th are all electricity high
Usually, RF signal input end leads directly to RF signal output.
Further, first resonant element and second resonant element are respectively adopted integrated shortwave frequency hopping filtering
Device is realized, and the working frequency of the integrated shortwave frequency hopping wave filter is 1.6MHz-30MHz.
Further, the integrated shortwave frequency hopping wave filter is packaged using radome.Exemplary, the shielding
Cover can be metal housing.
The amplifying unit, realizes, amplifying unit is applied in the first resonant element and second using integrated broadband amplifier
Between resonant element, useful radiofrequency signal first passes through the filtering of the first resonant element, then is amplified treatment by amplifying unit,
Then exported through the second resonant element frequency-selective filtering again.
Shortwave prognosis of the invention selects the specific work process of device as follows：
The main control unit of short-wave radio set by low frequency interface to shortwave prognosis select device with serial communication mode send needed for
Frequency signal, after control unit of the invention receives serial clock and data command, is converted by shift register
It is 16 parallel-by-bit tuning code A0~A15 (wherein A11~A15 is vacant any code), A10 selection transceiver channels, A8, A9 are carried out
Waveband selection, A0~A7 calls the data inside resonant element, produces useful frequency signal.
When A10 is high level, preselector work, radiofrequency signal is input into from preselector input, first passes through limited amplitude protection
Unit, if input signal amplitude is excessive, limited amplitude protection unit carries out amplitude limiting processing, and such as input signal amplitude is normal, limited amplitude protection
Unit does not work.
Radio-frequency input signals through the first transmitting-receiving converting unit selection by after limited amplitude protection unit, receiving passage, through first wave
Section converting unit selection working frequency range, signal output amplitude is improved by the first resonant element filtering process, then amplified unit,
Then processed by the second resonant element secondary filtering, working frequency range is selected by second band converting unit, finally by the
Passage output to preselector output end is received in two transmitting-receiving converting unit selections；When A10 be low level when, after select device to work, radio frequency letter
Number select device input to be input into from afterwards, first pass through the first transmitting-receiving converting unit selection hair passage, selected through first band converting unit
Working frequency range, treatment is filtered by the first resonant element, then amplified unit improves signal output amplitude, then by the
The treatment of two resonant element secondary filterings, working frequency range is selected by second band converting unit, is changed finally by the second transmitting-receiving
Device output end is selected in Unit selection hair passage output after.
Device is selected in shortwave prognosis of the invention, and control unit uses shift register, and the conversion speed of shift register is fast, short
Ripple prognosis selects the frequency converting time of device to be less than 1ms；Amplifying unit is arranged between two-stage resonant element, and resonant element can be filtered effectively
Except noise and clutter that radio-frequency input signals brings, shortwave prognosis selects the selectivity of device good.
Prognosis of the invention select device by test with it is actually used, frequency hopping speed is fast, and selectivity is high, stable and reliable in work,
After being applied to short-wave radio set, receiver sensitivity can improve 2dBm~3dBm, and emitter Out-of-band rejection can improve 10dB, can be effective
Improve the Electromagnetic Compatibility of short-wave radio set.
The above, specific embodiment only of the invention, but protection scope of the present invention is not limited thereto, and it is any
Those familiar with the art the invention discloses technical scope in, change or replacement can be readily occurred in, should all contain
Cover within protection scope of the present invention.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.
Claims (9)
1. device is selected in a kind of shortwave prognosis, it is characterised in that the shortwave prognosis selects device to be arranged inside short-wave radio set, the shortwave
Prognosis select be provided with device preselector signal input part, after select device signal input part, preselector signal output part and after select device to believe
Number output end；The shortwave prognosis selects the device to include：Control unit, limited amplitude protection unit, the first transmitting-receiving converting unit, first band
Converting unit, the first resonant element, amplifying unit, the second resonant element, second band converting unit and the second transmitting-receiving conversion
Unit；
Control signal input, institute that the control signal output of described control unit receives and dispatches converting unit with described first respectively
State the control signal input of the second transmitting-receiving converting unit, control signal input of the first band converting unit, described
The control signal input of second band converting unit, the control signal input of first resonant element and described second humorous
The control signal input of unit of shaking is connected in parallel；
The signal input part of the limited amplitude protection unit is used as preselector signal input part, and the signal of the limited amplitude protection unit is defeated
Go out the first signal input part of end connection the first transmitting-receiving converting unit；The secondary signal of the first transmitting-receiving converting unit is defeated
Enter end and select device signal input part after；The signal output part of the first transmitting-receiving converting unit is changed single with the first band
The signal input part connection of unit, the signal output part of the first band converting unit is defeated with the signal of first resonant element
Enter end connection, the signal output part of first resonant element is connected with the signal input part of the amplifying unit, the amplification
The signal output part of unit is connected with the signal input part of second resonant element, the signal output of second resonant element
End is connected with the signal input part of the second band converting unit, the signal output part of the second band converting unit and institute
The signal input part connection of the second transmitting-receiving converting unit is stated, the first signal output part of the second transmitting-receiving converting unit is used as pre-
Select the secondary signal output end of device signal output part, the second transmitting-receiving converting unit that device signal output part is selected after.
2. device is selected in a kind of shortwave prognosis according to claim 1, it is characterised in that
Described control unit is used to receive the Serial Control instruction of short-wave radio set main control unit transmission, and the Serial Control is referred to
Order is converted to 16 parallel-by-bit control codes, wherein, the 1st to the 8th control code is used to set the first resonant element and the second resonance
Unit produces resonant frequency；9th and the 10th is used to select first band converting unit and second band converting unit to work
Wave band；11st is used to control the first transmitting-receiving working condition for receiving and dispatching converting unit and the second transmitting-receiving converting unit；12nd
It is reserved place to the 16th；
When being 0 for the 11st, the first transmitting-receiving converting unit and the second transmitting-receiving converting unit are operated in reception state respectively, when
11st be 1 when, it is described first transmitting-receiving converting unit and second transmitting-receiving converting unit be operated in transmission state respectively；Or, when
11st be 0 when, it is described first transmitting-receiving converting unit and second transmitting-receiving converting unit be operated in transmission state respectively, when the 11st
For 1 when, it is described first transmitting-receiving converting unit and second transmitting-receiving converting unit be operated in reception state respectively.
3. device is selected in a kind of shortwave prognosis according to claim 2, it is characterised in that the first band converting unit and institute
The operating frequency range of second band converting unit is stated for 1.6MHz-30MHz, the operating frequency range 1.6MHz-30MHz points
It is 1.6MHz-3.999MHz wave bands, 4MHz-9.999MHz wave bands, 10MHz-30MHz wave bands.
4. device is selected in a kind of shortwave prognosis according to claim 1, it is characterised in that
Described control unit is made up of two shift register cascades.
5. device is selected in a kind of shortwave prognosis according to claim 1, it is characterised in that
The limited amplitude protection unit is composed in series by two power-type PIN diodes.
6. device is selected in a kind of shortwave prognosis according to claim 1, it is characterised in that
The first transmitting-receiving converting unit and the second transmitting-receiving converting unit are respectively adopted alternative electronic switch.
7. device is selected in a kind of shortwave prognosis according to claim 1, it is characterised in that
The first band converting unit and the second band converting unit are respectively adopted four and select an electronic switch.
8. device is selected in a kind of shortwave prognosis according to claim 1, it is characterised in that
First resonant element and second resonant element are respectively adopted integrated shortwave frequency hopping wave filter, and described integrated
The working frequency for changing shortwave frequency hopping wave filter is 1.6MHz-30MHz.
9. device is selected in a kind of shortwave prognosis according to claim 8, it is characterised in that
The integrated shortwave frequency hopping wave filter is packaged using radome.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611263611.0A CN106712805A (en) | 2016-12-30 | 2016-12-30 | Shortwave pre-post selector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611263611.0A CN106712805A (en) | 2016-12-30 | 2016-12-30 | Shortwave pre-post selector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106712805A true CN106712805A (en) | 2017-05-24 |
Family
ID=58905586
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611263611.0A Pending CN106712805A (en) | 2016-12-30 | 2016-12-30 | Shortwave pre-post selector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106712805A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108832966A (en) * | 2018-06-06 | 2018-11-16 | 武汉博畅通信设备有限责任公司 | Device performance optimization method is selected in a kind of shortwave prognosis based on automatic control technology |
| CN111953377A (en) * | 2020-08-20 | 2020-11-17 | 南京熊猫汉达科技有限公司 | Control system for built-in pre-post selector of no-load short-wave radio station |
| US11463119B2 (en) | 2019-04-18 | 2022-10-04 | Elbit Systems C4I And Cyber Ltd | High frequency radio including an adjustable-bandwidth tunable bandpass filter for improved detection of incoming calls and methods for processing incoming calls |
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| JP2005203935A (en) * | 2004-01-14 | 2005-07-28 | Matsushita Electric Ind Co Ltd | Tuner apparatus and integrated circuit used therefor |
| CN102946258A (en) * | 2012-10-10 | 2013-02-27 | 广州海格通信集团股份有限公司 | Short-wave narrow-band frequency-hopping pre-back selector |
| CN202798694U (en) * | 2012-08-15 | 2013-03-13 | 宝鸡烽火诺信科技有限公司 | Short wave rear selector |
| CN103763000A (en) * | 2014-01-07 | 2014-04-30 | 熊猫电子集团有限公司 | Short wave transmitting and receiving all-in-one module based on CPCI bus |
| CN104253628A (en) * | 2014-09-10 | 2014-12-31 | 宝鸡烽火诺信科技有限公司 | Short-wave pre-and-post-selector |
| CN204721355U (en) * | 2015-06-25 | 2015-10-21 | 国庆锋 | A kind of radio station launch control system |
| CN206341215U (en) * | 2016-12-30 | 2017-07-18 | 陕西烽火电子股份有限公司 | Device is selected in a kind of shortwave prognosis |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2005203935A (en) * | 2004-01-14 | 2005-07-28 | Matsushita Electric Ind Co Ltd | Tuner apparatus and integrated circuit used therefor |
| CN202798694U (en) * | 2012-08-15 | 2013-03-13 | 宝鸡烽火诺信科技有限公司 | Short wave rear selector |
| CN102946258A (en) * | 2012-10-10 | 2013-02-27 | 广州海格通信集团股份有限公司 | Short-wave narrow-band frequency-hopping pre-back selector |
| CN103763000A (en) * | 2014-01-07 | 2014-04-30 | 熊猫电子集团有限公司 | Short wave transmitting and receiving all-in-one module based on CPCI bus |
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| CN204721355U (en) * | 2015-06-25 | 2015-10-21 | 国庆锋 | A kind of radio station launch control system |
| CN206341215U (en) * | 2016-12-30 | 2017-07-18 | 陕西烽火电子股份有限公司 | Device is selected in a kind of shortwave prognosis |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108832966A (en) * | 2018-06-06 | 2018-11-16 | 武汉博畅通信设备有限责任公司 | Device performance optimization method is selected in a kind of shortwave prognosis based on automatic control technology |
| US11463119B2 (en) | 2019-04-18 | 2022-10-04 | Elbit Systems C4I And Cyber Ltd | High frequency radio including an adjustable-bandwidth tunable bandpass filter for improved detection of incoming calls and methods for processing incoming calls |
| CN111953377A (en) * | 2020-08-20 | 2020-11-17 | 南京熊猫汉达科技有限公司 | Control system for built-in pre-post selector of no-load short-wave radio station |
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