I have been experimenting with a Triax Twin KA TKT001 LNB.
The normal frequency coverage is 19.7GHz to 20.2GHz
I started out by measuring the DRO oscillator cavity size Outside Dimensions.
and then sanding down the whole dicast housing.
Then when I had removed close to 1mm I then moved onto the DRO puck,
Which I then proceeded to sand down thus raising its frequency of resonance.
Below is a picture of the PCB with the puck removed from the green circle with the red dots.
I used Nail varnish to re-attach the Puck to the board
So basically I made the cavity it sits in smaller and the puck thinner, in the hope of being able to recieve a 24GHz ATV signal generated with a Gunn oscillator.
I also took a scalpel blade and cut down the mixer tuned lines by about 1mm or so.
I also attacked the filters in the front end, however I am not sure how much improvement it gave me, I may be better to remove the filter altogether by overlaying with some copper tape.
Sadly I have no test gear to verify any of this its purely a trial and error modification.
I did not have to adjust the tuning screw that sits above the DRO in the cavity.
Here is the picture of the mods I made, if you make the same mods and have the capability of measuring the results? please please let me know.
Again this is purely a bodge attempt so do so at the risk of trashing the LNB.
Cheers for reading
Mark G0NMY