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Free Hand-Head Dual UHF
Performance
1. Using UHF676 to 1697MH band channel A: 677-686MHz: Channel B; 687,696MH2O, strong disturbance
resistance.
2. Depth 24Bit148KHz's high performance audio dedicated A/D and D/A conversion.
3. With automatic static speech and shock elimination circuit, to avoid the middle stroke and noise.
4. Digital Led display shows the current selected frequency.
5. Range up to 30m - 50m.
6. Battery circuit with overcharged protection.
7. Basic operation interface for easy and clear adjustements.
8. Excellent speech quality.
9. Can be used simultaneously without multiple stations. No interference and frequency alarm.
10. Indication of power supply and non-funtioning indicator.
Specifications
2.1 transmiter Technical Specification
1: frequency ： 676-697MHz
2: the channel number of 10 conservative values
each time the positive. ID.
In the manufacturer set the switch.
3: Oscillation mode DSP chip frequency locking 4:
frequency stable 10pm
5; RF efficiency 10 dBm
6: FG 40-18000Hz
7; distortion < 0.59
8: battery specification 1.SVIAA Size battery
9: Up to 4 / 8 hours battery life (specification 1:
frequency norm 676-697MHz, depending on
battery type and capacity)
User introduction
1. Power， ON/OFF
2. Volume ON(-),OFF(+)
3. Match Frequency Function: keep press SET key,
open the Power switch at the same time .When
the number in the display is flashing, the ID code is
in the match frequency state, and the receiver is
turned back on 2 seconds after the receiver is
turned off, that is, it mean the frequency is
successful.
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2.2 Receiver Techinal Specifications
1: frequency ： 676-697MHz
2: the number of channels is 10 (each
conservative value is timed by ID lattice, in the
manufacturer's frequency.
3: Oscillation mode DSP chip frequency fixed
4: rate stability + 10 ppm
5: bonding instruction -95 -71 dBm
6: frequency 40-18000Hz2
7: distortion < 0.59
8: signal ratio 390dB
9: high frequency output 300m / r (maximum)
Power / Volume
Jack
Antenna
Display
Original sound:
The wireless microphone emits the receiving chip, uses 24Bit/ 48KHz ' s high performance audio dedicated O- 2 A / D
and D / A processing, uses 1 / 4 π digital modulation and demodulation mode, full digital wireless transmission, which
is different from the traditional FM modulation and demodulation mode. During audio transmission, there is no need
for compression / expansion processing, also no need for pre- weighting / deweighting, to retain the original sound,
so the sound frequency, transient, ayanth and other indicators are very good, very close to the sound quality of the
wired microphone. That is to say: the same cartridge, using the wire connection, can achieve the sound quality
effect, using this chip, the wireless effect and wire effect can be very close.
To put it simply: the sound quality of the wireless microphone that everyone cares about, if the chip is used, the sound
quality can be completely determined by cartridge. By replacing the cartridge, the mic core uses wire connection to
test the sound. Find out the sound quality effect you like, and then install the core into the wireless microphone circuit
with the chip, the wireless mic sound quality effect can be almost the same as the effect of the wired microphone.
So the tone of the sound has become a reference, to the standard of a wired microphone, you can easily select the
core to select the sound quality.
Crosstalk
The system has a seamless microphone transmitting and receiving chip, and the sound is transmitted digital
encryption. Even if the same frequency is used, there will be no crosstalk as long as the user insert code (D) is set
difrefery,y When the receiving chip is disused by RF, it will only affect the receiving distance and disturb the noise.
We used to do experiments in the KTV room: to appropriately reduce the launch power of the handle (20-3Ometers in
use distance), using the "map four color principle" method, each separated two rooms, set the same.
K frequency (using different ID) with a total of only 16 frequency points, the entire KTV field dozens of rooms (can be
done) Continue to extend the number of rooms. Use 2 microphones in each room. Although each reom1l is subject to
the same frequency interference from the two rooms, the sound can be received normally satisfying the normal use,
and the overall working condition is good. This is the advantage of full digital processing chips. In many applications
(including KTV rooms), the concept of "frequency reuse" can be popularized. There is no need for a lot of channels,
the selection of frequency points is simple, and there is no need to worry about crosstalk. Of course, "frequency reuse"
is a new concept, and the FM solution is hard to achieve. The FM scheme in the market, from 1O0 frequency points to
200 frequency points, from 200 frequency points to 4OO frequency points, more and more frequency points, the
market propaganda: 200 frequency points can do 1OO KTV rooms; 4OO frequency point can do 20O KTV rooms;
10OO frequency point can do 50OKTV rooms. The chip can use 16 frequency points to do 500.
Frequency multiplexing
Frequency reuse is a major feature of the chip. For details, please see the description of the "crosstalk" section above,
which is also impossible for FM to do. In many applications, two receivers can consider frequency reuse and use the
same frequency as long as they are separated by a certain distance (Such as 1O meters). In this way, it is much easier
to choose the frequency point.
ID code:
ID code is the standard function of the chip. In the transmission process, ID code is used to encrypt data, as long as ID
code. Different settings, even if the same frequency, there will be no crosstalk phenomenon. The ID code is 32bit, so
when pairing operation, Just need to produce a ID code in a simple random way, the probability of the same two ID
code is almost zero, which effectively solves the problem of long overhearing crosstalk.
Matching
Matching code is a very meaningful operation in this scheme. It is recommended to use, similar to the bluetooth
function of the mobile phone. It is a great place to manage the production, sale and after- sales service of the
factory. Before pairing, the handset and the receiver are all common. After pairing, it becomes 1 to 1 bundles.
USER'S
MANUAL
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