hello to all
ok doing the math here is whats true.
if you were able to lower the lnb lo by exactly 200 mhz the lowest frequency you could receive is 10.600 ghz thats still far away from 9.540 ghz.
you take the lo frequency and subtract from transmitted frequency and the result must be within the 950 to 2150 range.
this is the olly way.
after 11700 the cross over frequency the 22khz kicks in and 10.600 ocs
kicks in and we have the upper band.
ok a satellite frequency of 10.719 ghz using the math of minus 9.750 ghz and we have 969 mhz and the receiver will see this no problem and we have tv.
thats why i said the lo would have to drop from 9.750 ghz to 8.580 ghz not possible to make a 1160 drop.
the band pass of the first stage of the lnb comes at about 10.700 and 10.600 ghz is no problem.
one would have to modify the band bass down to 9.5 ghz and the lo to run at 8.580 as well.
i have a friend who has a lab and the equipment to do this and has built transmitters up to 50 ghz as well and he builds tv transmitters as well and we talked about this on the phone the other day.
i have a satellite meter with a sprectum analizer.
i set up the dish on hot bird,find duna tv at 10.813 horz in analog and turn the lo screw untill i get duna at 10.903 and bingo i moved lo down 90 mhz.
and the lnb lo is running at 9.690 ghz.
when i receive a signal at 10660 i tune the receiver at 10750 and bingo it works with a 30 cm dish.
this in affect is at 1000 mhz and the sat tuner that runs at 950 to 2150 is in the tuner range.
you need a lot of equipment to modify the band pass and the lo to work 1200 mhz below its normal operating range.
1200 mhz is not 90 or 100 or 200 mhz but 1200 mhz.
if they sell the lnb modifies in a store in spain and you use a 30 cm dish the dish must point horz and the lnb will be towards the ground.
well hope this helps you subtracted the lo frequency from the frequency you are receiving and the diff must be within 950 to 2150.
ralph