Advice Needed Lnb dro adjusting measurement

Trust1

Trust1

Specialist Contributor
Messages
838
My Satellite Setup
1.8 m CM at SMR 1224 + Elev. with 7 lnb changer Ku (lin - circ) - Ka (lin - circ) C (lin - circ)
My Location
Nijmegen Netherlands
Is it possible to measure the LOF direct on the lnb (inside?) while adjusting the screw ?
I do have a sat PROFCARD 7301 and the VMA 138MHz-4.4GHz analizer .
 
Terryl

Terryl

Specialist Contributor
Messages
2,341
My Satellite Setup
OpenBox X5 on a 1 meter motorized dish.
And now a 10 foot "C" band dish.

Custom built PC
My Location
Deep in the Boonies in the central Sierra Nevada mountains of California.
You would need a spectrum analyzer the goes above 30 GHz or one that goes to three times the LO frequency, (LO frequecy is 9.5 to 12.5 GHz depending on the application the LNB is used for) this to look for any unwanted spurs or out of tune harmonics on the LO frequency, it would also need an isolated frequency probe (non contact) as to not affect the LO it's self.

That and a non-metallic adjustment tool, if looking at the IF output (900 MHz to 2.5 GHz) it may not work too good, as that frequecy is input dependent.

Why if I may ask would you need to adjust this??
 
Channel Hopper

Channel Hopper

Suffering fools, so you don't have to.
Staff member
Messages
27,517
My Satellite Setup
A little less analogue, and a lot more crap.
My Location
UK South
The trap is set by the manufacturer before gluing shut, usually by use of a varactor


Which LNB band ?
 
Trust1

Trust1

Specialist Contributor
Messages
838
My Satellite Setup
1.8 m CM at SMR 1224 + Elev. with 7 lnb changer Ku (lin - circ) - Ka (lin - circ) C (lin - circ)
My Location
Nijmegen Netherlands
Thanks , so I buyed the wrong analyzer (years ago)
Try to mod a Ka and Es Hail lnb .
 
S

s-band

Specialist Contributor
Messages
811
My Satellite Setup
1.5m IRTE PF, Octagon OSLO external Ref., TBS6983,
Various L, S, C, X & Ka bits. 1.2m S/X/Ku/Ka Prodelin on Az-El
My Location
SE UK
Try to mod a Ka and Es Hail lnb .
You can do it if you have the LNB on a dish and tweak it there. Find a known signal (beacons are best) and tune the DRO for the desired frequency at IF.

For Eshail, if you've got a TBS6983 & Crazyscan/EBSPro, leave the DRO where it is and modify streamreader.ini so you can tune below 950MHz. There are plenty of cheap PLLs that work well for EH using a TBS6983 etc e.g. Octagon OSLO.
 
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