There’re a lot of factories and workshops producing and assembling clones and copies of Dreambox receivers(DM500,DM600,DM800HD,DM7020,DM7025,etc.) in todays’ China mainland,although these receivers are all clones compared to the originals,but between them there’re still plenty of differences on electronic components,workmanship and of course quality.Laities can be cheated easily by the almost identical appearance and can not distinguish them apart.

Here,we would like take the DM500S for example to disclose/reveal not only the discrepancies between high-quality imitation DMs and low-quality ones,but also some impactful methods to identify these receivers’ differences.

You know,normally there’re two types cloned DM500S in China,one is the 4-layer PCB DM500S almost as same as the originals,this type produced by using 4-layer PCB and guaranteed high-quality electronic components,so its quality is excellent and could run steadily and safely.The other type is 2-layers PCB cloned DM500S,there’re so many factories and workshops producing these receivers by using 2-layer PCB and low-quality parts such as cheap ICs and tuners or even retreaded electronic components,and some important pars(such as LDO) also deleted deliberately in order to reduce the product cost,consequently,their quality is not good as the originals, the boxes can not run steadily enough.

Following are the most important difference between 4-layer PCB and 2-layer PCB receivers,backed up by relevant images,you can easily find these differences.

Image01:2-layer PCB DM500S.

Image 02:4-layer PCB DM500S.

Sequence Number	Electronic Components	2-layer PCB DM500S	4-layer PCB DM500S
01	PCB(Printed Circuit Board)	2-layer PCB------no self-contained earthed and power supply layers,causes low-quality of picture andSound and aslo reduction of receiver’s stability.	4-layer PCB------the receiver can accurately differentiate AGND & DGND to ensure the quality of the sound & picture of the TV programs.
02	Power Supply IC	Using cheap and inferior IC,such as ACT4060(about 0.15 USD/pcs),this kind IC’s Operating Frequency is only 410KHz,so the requirement of power inductors can be receded----it means the manufacturers can use low-quality power inductors also.(you can see 2 pcs ACT4060 on the 2-layer PCB DM500S’s motherboard)	Using high-quality IC,such as LT1940(about 1.8 USD/pcs),this IC can output double voltages,and it’s Operating Frequency is 1.1MHz.The excellent quality let this IC supplying steady and precise power for the master chip,tuner and other electronic components,so the receivers can work stably to offer you fantastic enjoyment of high-quality Images and Sounds.
03	Clock Oscillator	Using cheap and inferior IC 74HCU04 and Crystal Resonator(27MHz) to form the receiver’s clock oscillator,this clock oscillator does not have capability to control the voltage,so the frequency it outputs can be easily influenced by the external temperature, aging of components and so on, so the Frequency Drift appears,and it will causes mosaics, desynchrony of pictures and sound if the drift is too much.	Using expensive and high-quality IC,such as MK2727 or T73227 to form the receiver’s clock oscillator,both MK2727 and T73227 have capabilities to control the voltage,so the clock oscillator’s output frequency is amazingly steady and accurate,so you will never see mosaics, desynchrony of pictures and sound or other problems on these good-qualty receiver.
04	Audio Frequency DAC	Cheap and inferior IC PT8211,it’s a 16-bit dual track DAC,its’ parameters is:-68dB SNR,so you can know it’s just a low-grade DAC that always used to produce FTA receivers.	IC WM8761,it’s a high-quality 24-bit/192KHz Stereo DAC,its’ technical parameters are:-100dB SNR,-90dB THD,DAC Sampling Frequency:8KHz to 192KHz.
05	SDRAM	In order to reduce the product cost,using two pieces of cheap and low-quality SDRAMs,such as ELPIDA,or using one HYNIX and one inferior brand SDRAM,and it’ll causes compatibility problems	Using two pieces high-quality HYNIX SDRAMs,so the compatibility is good and these two ICs can work well together.
06	DVB-S Tuner	Inferior and cheap brand tuners—Gospell(model number:GST GSMS-99L) or other low-grade tuners.And some contemptible small factories using fake ALPS tuners,they buy Gospell tuners and change the logo & label into ALPSs.	High-quality and expensive tuners such as PHILIPS(model number:SU1278/LH2) and ALPS(model number:BSBE1-706A).
07	LDO Linear Voltage Regulator	Only one LDO left,another has been removed for reducing product cost,it’s ridiculous.	2 High-quality LDO Linear Voltage Regulator to ensure the power supplied to the tuner and other parts is steady and accurate

Hereinbefore we told you only several important differences,maybe you can find even more if you compare these two different receivers by yourself.

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What were selling are high-quality receivers,what were looking for is long-term mutual-beneficial business relationship,so please feel free to contact me if youre interested in our products,well supply you high-quality receivers and excellent services.