Reference. .
78621 few radio microphone of transformation.
Since entering the ranks of HAM has been out the whole have a number of second-hand radio equipment. Because it is used equipment, originally attached to the microphone, power connector and so had not accompanied with the device. Second-hand equipment, microphone, power cord, connect the fate of its first class of these components compared with the host device may be necessary to more tragic, and perhaps long into the recycling or recovery furnace Wumafenshi what was.The host device to be able to get out of the hands of people scouring is also transferred to his fans, otherwise, have you not seen the South common metals recycling full military equipment to wait minutes body, its scenes but so that the majority of HAM enthusiasts laments, shouting furnace under machine. I flag receives the number of radio stations (especially military aircraft) are missing microphone, usually have to pay attention at the Forum related to the transfer, see fit or favorite DIY, then dive down to lack of device configuration. Of course, due to financial constraints, some of my basic charge, cheap bargain luxury goods can only wait and see. In order to transform the last few years have started to open several close to the microphone, and draw the corresponding circuit drawings are sorted out for your reference. .
First, KYODO taihe KG105 microphone.
KYODO KG105 wagon 80 of the last century, large quantities of imported car platform, currently used in more common. The station introduced BBD components of sound processing, able to eliminate the trailing edge of each call in noise, so listeners feel the calling process was very smooth. I am very pleased with this deal, only to open when the general at home waiting for this machine. The original microphone to use with transistor amplification of dynamic microphones, moving coil voice coil can not use direct input. The transistor amplifier circuit is very simple and very easy imitation. .
Second, the MP20 SC-U SHUER Shure microphones.
This microphone is the first online Amoy (very cheap) and then wiring, which is characterized as electromagnetic microphone. Currently, after transformation into the machine for SUNAIR SC-10. As the SC-10 of the MIC had to DIY a bit special, Block 5, will use the core plug. .
Figure: internal circuit.
3, SHUER Shure 488T microphone. .
Microphone to delivery, it is said that BG1BNB is also used in military aircraft. The original plug is a than ordinary 6. .5mm three-core audio plug small plugs of pure copper, open mic internally found mouthpiece is electromagnetic but has been corrupted. In the hands of a 600 Ω dynamic header size is suitable for the space, the swap in which nearly equal to his first wife. This microphone is characterized with a germanium transistors inside the amplifier circuit. Now replaced by MSR8000 machines use.
Three districts had a new soldier has got this microphone, there is no clear instructions to get to, only on a vague look. .
4. MOTOROLA HMN1061A waterproof microphone.
Motorola HMA1049A, HMN1061A, HMN1051A, HMN1001B are waterproof hand microphone M in mind. Electret microphone used with transistor amplification and power protection. Open microphone that work well within Motorola, optional components are more sophisticated, can be seen from Motorola's work style, I like it better. I used this microphone was changed to Motorola Micom XF machine use. .
5. MOTOROLA MBTMN1027A microphone.
Motorola MBTMN1027A electret microphone using a three-transistor amplification and power protection. The microphone features a hook on the back office has a micro switch in series with the PTT button, to estimate the design features is that when the microphone hanging in the hook to avoid inadvertently fired when the (then press the PTT button does not launch). .
VI. MOTOROLA HMN1056D microphone.
Motorola HMN1056D, HMN1074A is often said that the white microphone and Pak microphone. As yet find a way to open (on the back of strong non-screw, is fastened by a plastic phase of). Do not see the internal circuitry, guess it still is the use of electret microphone with a transistor amplifier, the main platform for Motorola's vehicle use. Such as: GM300, M208, etc.. Another characteristic of such microphone PTT is controlled by internal mechanical switches to electronic switch (using a Darlington transistor to implementation). .
Web interface circuit diagram:.
Perhaps within the figure:. .
VII. MOTOROLA TMN6013A dynamic microphone.
Motorola TMN6013A, HMN4000A is the M remember the old dynamic microphones. Its internal structure is simple, it is a moving coil microphone output and a normally open direct two-way PTT switch. This switch, then taking into account the moving coil microphone access control circuit switching. .
8. dynamic microphone KENWOOD.
KENWOOD DYNAMIC MICROPHONE moving coil microphone volume is very large, weighty feeling in his hand, but the open-house is very disappointing. The internal is a direct access from the moving coil microphone and a small non-point micro switch button as PTT, the overall weight of a garden entirely from the back of the form of cast iron. The moving coil microphone PTT is not through switch control regardless of how the state has access to the circuit. Microphone from the design and production to make my impression KENWOOD product quality greatly reduced. Match with the huge microphone six core spiral thin flexible disproportionate. .
9 M/A-COM MC101616V1 microphone.
Only when this microphone to the microphone first, the line has been cut. See signs for the South Korean manufacturer, waterproof performance. If using the moving coil microphone with a transistor amplifier. The microphone features and Motorola MBTMN1027A similar detection circuit with a hook, when the microphone is hanging hook on the way when the output transistor control, can be done against false triggering. .
This microphone design idea is good, use materials also fastidious, even shell screws are made of stainless steel (waterproof microphone in front of the Motorola inside the selected material, though it is not bad but the shell screws are or rusty), guess its performance should also be able to do. Only its appearance, I don't like that at present there is no practical application for it.
10, with dual microphone audio keyboard. .
This type of microphone internal usually contain a dual audio generation chipset (UM95087), in addition to voice from MIC port input signal, thereby producing audio signal circuits to achieve digital input. Usually to achieve the "0 ~ 9, *, #," this "input. This type of microphone all manufacturers have, however, in addition to the numeric keys of other special features, all manufacturers of products between intended not only to the respective application.
11, made the meeting microphone CD1-2 transformation. .
CD1-2 is the first radio equipment factory in Beijing (Beijing 797 factory) production meetings with a desktop microphone. When the microphone is rural radio, if you look past the old movies, television could see its shadow. Typically used in his head in a Red satin bag silk more charming. This receiver via a built-in transformer for two output impedance: 600 Ω and 20 k Ω, easy to match the sound input. My hands have a CD3-11 microphone basic profile (parameter unknown), is even more compact and more.
Modified using the KG105 circuit, the actual feeling of the use of high sensitivity is not enough. To add a transistor amplification may be better to wait after the experiment. .
12. Motorola TMN1008C desktop microphone.
In an online only search TMN1005B desktop microphone circuit. Comparison of the circuit through consistent practice. The use of three-wire electret microphone microphone, two triode amplification, in addition to launching key things, additional monitoring button, but the specific use monitoring key unknown (estimates should match the specific machine application). I do not like his personality began to form, but in practice the transformation process, using KG105 seven core plug and use only the launch of key features, when used in the next KG105 results achieved in order that my admiration. .
XIII. the renovation MSR8000 microphone.
Recently incorporated into the MSR8000, because there is no match for the dynamic microphones machine is basically half a year after the launch function for the test. I remember I had two hands with a speaker inside the electret microphone, identify and analyze MSR8000 by rummaging through the interface functions on the MIC, the change in the MSR8000 its use. In addition to the modified microphone does not have the physical plane, the other side with MSR8000 is really seamless. .
As a result of electret need to supply a voltage to work, so when you use the converted MSR8000 of carbonaceous microphone input line. After it has been used BG1IWK reflect this microphone sound sensitivity is still quite high. So to just solved using MSR8000 friend said MSR8000 dynamic microphone bad, and the sensitivity of the issue. Previously I on this conversion method, not many in here.
14, SUNAIR SC-10 Microphone transformation. .
The MIC input SUNAIR SC-10 interfaces use a 1 ? capacitor across the straight. Therefore, can only be used to directly access the first-class lap. Previous SHURE SC-U MP20-sized for this machine. Just this machine MIC interface socket so special, you can temporarily use DIY one emergency.
15, Motorola MICOM-XF microphone transformation. .
MICOM-XF is Motorola production, in line with the United States Army awarded standard Adaptive radio. Its microphone interface. And other military aircraft similar to the MIC output contains one audio output (4 feet). Otherwise the 5 foot, its still + 5V voltage exists, but the purpose is unknown.
To find the matching plug the original estimate is impossible. However inadvertently from the Internet search to 7 areas friend BG7IFA posted in 2 years of post transfer of M recorded microphone, microphone interface and see which resemble this machine. Purchased by the contact hand on the machine a try just match. BG7IFA also buy two get one, well aware of the friends that they are only gifts of more than one good, haha. Really "beyond the pale no searching, no effort was to all." .
This type of connector is not only a special appearance, is also a special removal method. A study themselves for half a day is not clear how to easily disassemble and finally only rough. Department of ideas which are crimping marks a word gaizhui slowly pry the crimping section, was able to see it. There is as yet failed to leave open the picture, the next time you have the opportunity to complement.
Microphone model: TMN6134A, TMN6134B, HMN1049A. The internal structure of three microphone varied use to MICOM-XF machines need to change the internal wiring can be applied (see, although this microphone interface, consistent with this machine, but not for this machine is equipped with the original). .
16-summation.
From the above variety of microphone circuit analysis, it is easy to see that current radio microphone circuits are mainly four types:. .
① circle (or dynamic magnetic) mouthpiece direct output. This type of microphone without amplification circuit, it does not require a transmitter with power, transformers or capacitance to access radio. The benefit is a simple circuit, low output impedance, high reliability and long service life, but in some situations or environments, the sensitivity is not felt. This type of microphone to dynamic microphone for KENWOOD..
② with transistor amplification of dynamic microphones. Its internal includes a transistor amplifier, so the applications need to provide a MIC input pole is about 5 ~ 10V voltage for the transistor used. Advantage of the higher radiation sensitivity, and strong points without losing dynamic microphones. Such microphone to the microphone as the representative original KG105. .
③ electret microphone. Electret mouthpiece is actually a capacitor first-class internal MOSFET received level conversion output impedance. Therefore, electret first-class in use must have a power supply voltage is usually also need to increase the level transistor amplifier circuit, and even some products also has secondary amplification circuit (e.g. TMN1008C desktop microphone). This type of microphone sensitivity can do very well, but its poor reliability and life expectancy is shorter. This type of microphone to Motorola's products are typical representatives.
④ multi-function microphone with digital keys. Such a lack of universal microphone, only to realize special functions to find Original, imitation more difficult. But if only required for voice and PTT function is not mentioned over the three format routines. .
Modification of the current radio microphone basic hyper-out of these three modes. Therefore, we do not find the radio microphone is embarrassed. As long as you don't mind and genuine or not, as well as special features, etc, can be a little look at the radio MIC interface, you can quickly copy a good microphone. Course on modern radio-receiver is not easy to clone, YAESU FT-857D full-featured digital microphone MH-59A8J, I can only spend a high price to come back to play with.
I wish you all happy playing machine! . .
78621.
April 15, 2009. .
