PCTV DVB-S2 Stick (461e) teardown
|PCTV DVB-S2 Stick (461e)|
Only differences between old and new version could be found from the device internals, where DTV chipset is changed to totally different one. Old model uses NXP TDA10071 & Conexant CX24118 demod & tuner combo, whilst that new one is build upon Montage M88DS3103 & Montage M88TS2022. 461e appeared to marked circa one year ago (around September 2013) and replaced old 460e quickly. 461e USB ID is 2013:0258, whilst 460e uses ID 2013:024f.
Initial Linux driver went into Kernel 3.14. Currently that device is one of the rare USB satellite receivers, having both good availability and drivers in mainline kernel.
Unfortunately I don't have a retail package, but only the stick itself. Retail package should include additionally remote controller and USB cable - which are those same coming with almost every PCTV Systems USB receiver. So lets forget all that extra stuff and take a look to device internals!
General hardware designDevice is build on single PCB, having USB connector on other end and antenna connector on the another. There is surprisingly large amount of components, assembled to both PCB sides rather compactly. I wonder how there could be that much extra components needed for connecting few chips together... PCB is also rather big if you compare to most DVB-T USB devices, but DVB-S/S2 receivers tends to be bigger than DVB-T receivers always. I think it could be still even smallest USB satellite receiver currently.
External 12V power supply is needed, as always for USB satellite receiver, feeding power to LNB. Similar (same?) power supply was used for old 460e too.
PCB upper side
|PCTV DVB-S2 Stick (461e)|
27 MHz clock needed is feed from crystal located another side of the PCB.
There is another very similar chip seen on some other PC receivers. That chip is M88DS3002. I suspect it is only earlier revision and differs marginally from the M88DS3103. Even before M88DS3002 there was M88DS3000 DVB-S/S2 demodulator, which is same chipset family, but differs more or less from M88DS3002/M88DS3103. There is existing Linux driver for old M88DS3000 too. M88DS3000 => M88DS3002 => M88DS3103.
M88DS3103 demodulator in conjunction with M88TS2022 tuner is very common DVB-S/S2 DTV chipset currently. I don't have clear vision how widely it is used for STBs or TVs, but for PC TV market it is in practice the only one chipset used at the moment.
In this picture there is remote controller receiver partly top of the EM28178. It is that quite big three pin component having long legs.
Required 12MHz clock is coming from crystal located another side of the PCB. Also eeprom, needed by bridge, is located another side. EM28178 loads configuration from the eeprom during power-up. That configuration contains USB ID amongst the other things.
Same EM28178 bridge chip was used for PCTV tripleStick (292e) receiver too.
Chips is controlled over I2C bus.
That same chip was used for older 460e model too.
PCB bottom side
|PCTV DVB-S2 Stick (461e)|
Crystal near antenna is 27MHz and feeds clock for demodulator and tuner. Another crystal, center of PCB, is 12MHz for USB-bridge.
12.000 MHz crystal
|Xtal 12.000 MHz|
27.000 MHz crystal
|Xtal 27.000 MHz|
Alpha and Omega Semiconductor’s AOZ1360
|Alpha and Omega Semiconductor’s AOZ1360|
Component is passive and do not need a driver.
Linux driverLinux driver has been in kernel since 3.14. Device driver consists of 4 chip drivers: em28xx, m88ds3103, m88ts2022 and a8293.
Device needs firmware for M88DS3103 demodulator, which could be downloaded from here.
Are there datasheets for Montage M88DS3103ReplyDelete
Montage M88TS2022 available?
You should ask for Montage.Delete
I know this is a long time after the post but I just recently got one of these due to the driver being in the linux kernel and although it's recognised and firmware is loaded to the device and everything seems good it doesn't actually provide power to the LNB so it doesn't work. However if I plug it into a windows box once the supplied software finds the device it provides power to the LNB and everything works as expected. Is there possibly a new revision of this stick?ReplyDelete
Which application you used to tune? Could you try w_scan?Delete
This comment has been removed by the author.Delete
Sorry I took so long to reply I wanted to test a bunch of stuff to make sure it wasn't just user error.Delete
As far as I can tell there's no concept of power control for this stick. So if you have a standard LNB it works just fine and you don't even need to plug in the power adapter that is supplied.
This means however if you wanted to put a sat finder between the stick and your dish for initial setup it won't get powered up. If your LNB requires power for some reason or you have anything inline that takes power (a rotor for instance) the stick seems to fail I guess because not enough power makes it to the LNB. DiSEqC of any sort is impossible because the required power isn't there.
What is interesting is that under windows there seems to be a similar problem (I did limited testing with this) in that the installable BDA drivers seem to behave the same way in that if I use DVBDream for instance I can't tune if I have a rotor or anything in the way. However if I fire up TVCenter it will tune and I can use positioning controls in DVBDream if I run it at the same time.
Running TVCenter under windows produces power from the included PSU
Every other program/driver seems to ignore the PSU and doesn't switch the voltage through to the coax.
Will tune successfully with standard LNB if no power requirements on the input from the dish.
I have discovered the same power issues with this adapter, I use C-BAND so can not test TVCenter, I don't know why PCTV won't offer the option for C-BAND LNB frequency in setup. With DVBViewer I have had success only because you can turn power/on off between switching Transponders. But that doesn't help either really because at some stage the recieved signal becomes unstable. Probably because as you're saying, it doesn't supply the power to the LNB
Hope they fix this soon, I've asked for a refund, totally disappointing and they don't mention they don't support C-BAND, yet they have cband muxes in their scan configs , no good
Hi, was this power issue ever resolved? If not is a short run straight to an lnb sure to work? Thanks.ReplyDelete