sky Q wideband LNB

Ideas, technical topics, help and discussion for ATV enthusiasts
Forum rules
This forum is run by the BATC (British Amateur Television Club), it is service made freely available to all interested parties, please do not abuse this privilege.

Thank you
Post Reply
m1cdq
Posts: 47
Joined: Thu Feb 28, 2019 4:28 pm

sky Q wideband LNB

Post by m1cdq » Wed Jan 22, 2020 4:19 pm

I have just been pulling apart a SKy Q wideband LNB
the info I could find on it is
info I could find is
it has 2 outputs one H and the other V
LO: 10.41 GHz
Input Frequency: 10.7 -12.75 GHz
Output Frequency: 290-2340 MHz
WIN_20200122_15_39_55_Pro.jpg
WIN_20200122_15_39_55_Pro.jpg (100.29 KiB) Viewed 1466 times
what i think is a tcxo has 50.048 on it
the Ic has MXL802 9B171.18 1901 CC

what info i can find on the chip is
Dual Ku-band down-conversion to IF
10.7 GHz-12.75 GHz RF range
290 MHz-2350 MHz IF range
9.75 GHz-11.95 GHz LO frequency range
Single-ended RF
Differential IF (MxL801), or single-ended IF (MxL802/MxL803)
Highly-integrated solution
Image rejection filter
Crystal oscillator and PLL
Down-conversion mixers
IF amplifiers
LNA bias with an integrated negative voltage generator
POR
Configurable parameters through programmable pins
IF gain
Reference clock frequency selection
LO frequency
LNA bias
Single 1.8V supply voltage with an option for a 3.3V supply for an external LNA bias.
looks like the LO is programmable
if I have my maths right
if the LO is shifted to 10.0575
then the lower NB beacon would be at if 432.050mhz

also this would also make the lower WB @433.500 and upper WB @441.500

I dont know if this info is of any use the the LNB gurus out there.
can it be modded

but it looks like the sky Q tuner has an If range from 290-2340
going to see if i can find a sky q box to look at the actual tuner inside it

g0mjw
Posts: 1174
Joined: Sat Sep 20, 2014 9:15 am

Re: sky Q wideband LNB

Post by g0mjw » Thu Jan 23, 2020 5:51 pm

Interesting

If the reference really is 50.048 they are going to cause interference to 6m CW and also be detectable that way, but apart from that 10.41 GHz might be reduced to a more useful ~10 GHz by changing that reference to around 48 MHz. Do you have a better image of the reference?

Even if they are programmable I doubt they are field programmable, it's an extra step and adding a microcontroller to set it is asking for reliability problems.

Mike

m1cdq
Posts: 47
Joined: Thu Feb 28, 2019 4:28 pm

Re: sky Q wideband LNB

Post by m1cdq » Fri Jan 24, 2020 12:46 pm

the best i can do

its 3.17mm x2.45mm
found on http://www.satnews.com/story.php?number=1095433624#

All MXL80x can be configured either using an Inter-Integrated Circuit (I2C) interface or via programmable pins. The I2C configurability enables a highly optimized and flexible system solution when an MxL80x device is combined with an MxL86x SoC. MxL80x devices come with a comprehensive evaluation kit, allowing customers to exercise the complete Ku-band RF front-end from LNAs to IF with the ability to configure IF gain, LO frequency and LNA bias settings.

pdf for the IC https://www.maxlinear.com/pb/mxl801_mxl ... 803_pb.pdf
WIN_20200124_12_21_22_Pro.jpg
WIN_20200124_12_21_22_Pro.jpg (162.28 KiB) Viewed 1315 times
WIN_20200124_12_21_32_Pro.jpg
WIN_20200124_12_21_32_Pro.jpg (145.97 KiB) Viewed 1315 times
WIN_20200124_12_23_00_Pro.jpg
WIN_20200124_12_23_00_Pro.jpg (132.69 KiB) Viewed 1315 times

m1cdq
Posts: 47
Joined: Thu Feb 28, 2019 4:28 pm

Re: sky Q wideband LNB

Post by m1cdq » Tue Jan 28, 2020 3:29 pm

the Lo can be reprogrammed
81AA9FBE.png
81AA9FBE.png (29.96 KiB) Viewed 1132 times

Post Reply

Return to “General ATV Discussion”