
I was thinking maybe the feedhorns use a front-end BP filter switchable between 17-18GHz and 18-19Ghz or something similar. They may also use a different LO frequency. Aren't there any feedhorn specs from DTV?
Here is the 4K LNB in case anyone is interested
http://www.solidsignal.com/pview.asp?p=3d2rblnb
Reference
http://manuals.solidsignal.com/slimline ... manual.pdf
Apparently this is the only meter that can tune the 4K LNB
http://www.solidsignal.com/pview.asp?p=aim15
Might find some useful info about the meter, or heck just order it!!!