D-Link’s COVR-2202 tri-band mesh products, if there is a strong demand for wireless networking, buy this person can not be wrong, but unfortunately in can not be divided into frequency.
The two bodies are the same, in order to prove the same, I took two units were weighed, the weight is 690.7 grams. So just take a random one to demolish it, I do not know 2 sets of 4 can only be grouped, because there are no 2 sets to do the test.
The power supply specification is 12V/2A, which is well received.
There are only 2 network ports on the body.
The bottom three screw threads are removed to share out the base and shell:
The body is very heavy, more than 500 grams, one third of the weight comes from a radiator.
The back of the motherboard also has a heat sink aluminum.
The top antenna has a total of six, normally the three frequencies are 2x2mimo only need four antennas, two dual-band, two single-band 5G, and covr2202 but with six antennas, the back to see the RF circuit to know what is. The following figure, two copper tube antenna, two large PCB board antenna on the side, and the top two small PCB board antenna.
Separation of the base from.
Remove the top antenna components: black and red are dual-band antennas, gray is the copper tube, white is the small PCB, blue is the small PCB, and yellow is the copper tube.
Look at such a thick heatsink, heat see such a powerful heatsink, directly scared away, so it is conducive to heat dissipation.
Thick heat sink this top I define as the front.
The heatsink is on the back of the motherboard:
Take off the three screws on the back heatsink, you can share out the heatsink, as shown below. A see there are four pieces of thermal conductive silicone pad and heatsink connected. There is a piece of gray thermal conductivity and shielding role of I do not know what material, it feels like it has a chip underneath.
The thick heatsink on the front of the motherboard was also taken off, and, because there is a large piece of thermal conductive silicone pad between the shield and the heatsink glued firmly, the shield was finally separated out along with the shield, wow, the first time so easy to open the shield. In the future, you can use suction cups to remove the shield, how I did not think of before.
The heat sink over the weighing, 287.4 grams, excluding the shield and thermal conductive silicone is estimated to have 230 grams, just a third of the weight of the whole machine.
Start by looking at the back of the motherboard, the memory chip, model W632GU6MB-12, DDR3 memory, capacity 256MB.
The memory chip above has a gigabit switch chip to the left, model QCA8072, which supports two gigabit ports.
There is a flash memory chip below the memory, model number W25Q256JVFQ, with 32MB capacity.
Summary diagram of the three main chips on the back of the motherboard.
Now look at the front of the motherboard.
The largest area of the chip model is IPQ4019, quad-core 717MHz CPU, while supporting 2.4G and 5G, both 2x2mimo, both support 256-QAM, 2.4G maximum rate of 400Mbps, 5G is the maximum rate of 866Mbps.
The main thing is to look at the wireless RF circuit, look at the amplifier chip. The following figure is a four-way wireless led from IPQ4019, two gold is 5G low-band dielectric filter, QPF4519 is a 5G amplifier chip, Netgear R6800 and ASUS AC85P is also used QPF4519, is considered a high power. Silk-screened with 3Q 1WPV I do not know what model, check the information to be added later, is definitely 2.4G PA chip.
The QPF4519 integrates PA and LNA, and its parameters are as follows.
5150 – 5925 MHz
POUT = +23dBm MCS9 VHT80 -35dB dynamic EVM
POUT = +24.5dBm MCS7 HT20/40 -30dB dynamic EVM
POUT = +25dBm MCS0 HT20 spectral mask compliance
160MHz bandwidth and MCS11 capable
Optimized for +5 V operation
32 dB Tx gain
2 dB noise figure
16 dB Rx gain & 6.5 dB bypass loss
25 dB 2.4 GHz rejection on Rx path
In 80MHz bandwidth and 256-QAM maximum amplification power +23dBm = 200mW.
Now look at another 5G chip, the model must be QCA9886, IPQ4019 + QCA9886 is the standard configuration of the three frequencies. qca9886 supports 2x2mimo, the maximum rate of 866Mbps. external amplifier chip, the same model as the previous, also QPF4019. so the parameters will not repeat. It leads to a 4-way antenna, the first two groups, each group connected to the vertical copper tube antenna and the horizontal small PCB board antenna.
Do not understand, look at the antenna diagram, the blue box in the figure below are connected to the QCA9886 lead to four 5G antenna, QCA9886 is 2x2mimo, there are two 5G, each way are connected to the horizontal micro PCB board at the same time and the vertical copper antenna, of course, this is not working at the same time, it is based on the quality of the antenna to choose a way to transmit, horizontal antenna and vertical antenna two choose one. . It is also the principle of diversity antenna.
It can be understood that when the phone is placed flat on the desktop, the horizontal PCB antenna is used, and when the phone is placed vertically, the router uses the vertical antenna.
The front of the motherboard chip summary chart.
At this point, COVR-2202 disassembly is complete. Take the Xiaomi 4C downstairs in the D point speed measurement 100Mbps / s not more than 110Mbps / s, also on the level of the Redmi AX5, there is a negative feeling of QPF4519.
Xiaomi and 360 can not be in AP mode group mesh, not it can not, but it does not want to do so, afraid to lose the role of “gateway”, lose a lot of benefits. I think the biggest advantage of COVR 2202 is the ability to group mesh in AP mode, as follows, there is a bridge mode, so you can connect to the original main route to use, as follows.