Guangzhou DSPPA Audio Co., Ltd.
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Tel: 020-28346138
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D665 Series Wireless Microphone System

  • Introduction
  • Specification
  • Connection

This product adopts radio frequency transmission and is susceptible to outside wireless signals interference. DSPPA Audio promised. All products are qualified products which passed strict testing. If instantaneous frequency-loss occurred in the installation and application, in most cases, the system frequency of the product is affected by the interference of the external ambient factory. If it happens, please carefully check the interference of external and internal installation ambient factors listed below, and make appropriate settings and adjustment on ambient and system. 







(Host + 2 Handheld MIC) D6650
(Host + 1 Handheld + 1 Waistband + 1 Collar MIC) D6651
(Host + 1 Handheld + 1 Waistband + 1 Headset MIC) D6652
(Host + 2 Waistband + 2 Collar MIC) D6653
(Host + 2 Waistband + 1 Collar + 1 Headset MIC) D6654
(Host + 2 Waistband + 2 Headset MIC) D6655


1. Whether there is television tower, large cell phone launch base station or other strong jamming signals around the site
2. Whether there is a mobile phone signal amplifier installed in the site.
3. Whether high frequency wireless intercom system is used in the site, and other brands of wireless microphone systems is installed
4. Whether there are other metal objects that may block or attenuate wireless signals around the system.
5. Whether the receiver antenna is too close to the computer, the computer or other radio frequency interference machine.
6. Whether there is an obvious obstacle between the receiver and the transmitter
7. Whether the surrounding environment is too humid.

Technical terms

UHF
UHF is the Written in English of ultra-high frequency, mainly it indicates 300 ~ 3000MHz ultra high frequency radio waves.
PLL
PLL is the abbreviations of phase locked loop, when wireless microphone is transmitting and receiving signal by frequency synthesis, it can receive signal satisfactorily within a frequency band signals, and it can also switch work channels arbitrarily in this frequency band.
DIVERSITY
It means Diversity Reception, a method to reduce or eliminate mufti-path frequency loss by using two or more antennas and receiver. The most commonly used methods include dual antenna phase switching, dual receiver audio switching, and "ratio diversity" audio combination. The most effective method is the ratio diversity combination
Squelch
When the receiver of the wireless microphone is not receiving the signal, or the signal is weak, the output signal will be automatically cut off to avoid outputting noise, which is called squelch
Frequency loss
When the transmitter is at some location of the room, the carrier signal and the sound are lost in an instant, or the background noise is enhanced. Just move the location of transmitters (even just a few inches). Usually the sound will turn to normal


1.1 System parameter

Model

D6650/D6651/D6652/D6653/D6654/D6655

Working frequency

600-800MHz

Modulation type

FM

Channel

200

Channel spacing

250KHz

Frequency stability

±0.005%

Dynamic range

100dB

Max. deviation

±45KHz

Frequency response

50Hz~18KHz (±3dB) (The frequency of the entire system depends on the microphone unit)

Signal/Noise ratio

>105dB

Composite distortion

≤0.5% @1000Hz

Working distance

About 200 meters

(The working distance depends on many variables, including absorption, reflection and interference of RF signals)

 

   Working temperature

-10℃~+50℃

Package size (mm)

590×320×115

Gross weight

5kg


 

1.2 Receiver index

Receiver mode

 

Secondary frequency super heterodyne

Mid-range frequency

110MHz,10.7MHz

Antenna access

BNC/50Ω

Sensitivity

12dBμV(80dB S/N)

 

Spurious noise suppression 

≥75dB

Audio Output Level:balanced output

+10 dB(XLR)

Audio output level: unbalanced output

+4 Db(1/4”,6.3mm  Jack socket )

Power supply mode 

DC 12V 500mA input

Stray inhibition

>75dB

Audio output

200mV

Output impedance

XLR: 200Ω 1/4"1KΩ

Distortion

<0.1%

Function display

LCD

Machine size

484×210×44mm

Net weight

1.95kg

 

1.3 Transmitter index

Microphone

Dynamic Microphone

Antenna

Handheld microphone with a spiral antenna, wearable transmitter adopts 1/4 wave length whip antenna.

Output power

High power 20mW; Low power 7mW

Transition power

10mV

Spurious noise suppression 

>50dB

Power supply

2pcs AA 1.5V  alkaline batteries

Validity of battery 

20mWwill last for 9 hours, 7mW will last for 13 hours

Function display

LCD

Net weight

0.45kg


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  • Tel:+86 020 37166520
  • Fax:+86 20 81305947
  • Email:export@dsppa.com
  • Address:Jianggao Town, Baiyun District, Guangzhou, China